Anorexia nervosa essays

Anorexia nervosa articles Anorexia Nervosa is one of the most normally known but then least perceived dietary issues. Anorexia is a dysfunctional behavior, which influences the two young men and young ladies inside typical weight ranges who think they are overweight. The beginning periods of Anorexia are frequently hard to identify. An individual should comprehend what to search similar to early manifestations and recognize what steps to take to help, however the most significant thing is attempt to make sense of what hidden issues could be liable for the condition. Anorexia starts with sentiments of self-assurance and higher confidence as the consequence of a progressively appealing appearance causing the individual to feel as though they are increasingly equipped for dealing with social connection (Anorexia, Dying to Be Thin p.1-13). As the anorexia advances, his/her distraction with remaining meager, which the person in question accepts gave his/her sentiments of progress, caused his/her to focus significantly more on his/her weight (Anorexia, Dying to Be Thin p.1-13). In the end, the anorexic's body will begin to decay, his/her confidence will reduce, and the person in question will start to expel themselves from social communication (Anorexia, Dying to Be Thin p.1-13). Correspondence with his/her family or companions will likewise be diminished or stressed (Anorexia, Dying to Be Thin p.1-13). Before all else stages an individual could see that the anorexic is practicing unnecessarily or inclined to hyperactivity. (Anorexia, Dying to Be Thin p.1-13). The anorexic will show bizarre eating practices, and continually express the dread of putting on weight, despite the fact that they don't. Anorexics are frequently high achievers. The person in question will be one of the educator's top picks, since they never cause any difficulty and think their best is rarely adequate (Anorexia, Dying to Be Thin p.1-13). Furthermore, they never disrespect their folks, and never object (Anorexia, Dying to Be Thin p.1-13). In the event that the anorexic fizzles, she fears that individuals won't have anything to do with her. Anorexics se... <! Anorexia Nervosa articles Anorexia Nervosa is an intense infection that is tormenting numerous youngsters in our general public. This is something that is turning out to be increasingly pervasive. It is something that ought not be trifled with. I have decided to do my Science report on this theme, since it is something interesting and it is found in numerous teenagers. This is a point that is excessively unfamiliar to numerous individuals and they should be taught regarding the matter. I would like to help that in at any rate I can. In the accompanying passages I will talk about the notice indications of anorexia, the individuals influenced by the infection, the illness itself, and specific kinds of medicines for the confusion. Initially, I might want to talk about the notice indications of a dietary issue. The physical side effects are a lot simpler to recognize, so I will begin with them. The first and most clear sign is outrageous weight reduction, which you can without much of a stretch recognize. To attempt to cover this the anorexic will begin to wear loose dress trying to disguise the weight reduction. An anorexic will likewise make each endeavor to stay away from a circumstance where food or suppers are served. Circumstances such as this will be truly awkward to them, since it leaves them powerless against inquiries regarding their dietary patterns. This is something they need to dodge no matter what. Another piece of maintaining a strategic distance from suppers is to get ready large dinners for gatherings of individuals and eat practically nothing. The anorexic will give pardons like, I'm to tired to eat, or, No, that is alright you should simply eat. I set it up for you. This we should them free as far as they could tell. They make it look as they are too worn out after all the difficult work they have placed in and ordinarily no one causes to notice it. An anorexic may likewise begin to lose hair on their head or start to develop better hair on the body. This is one sign that you will need to search for in the event that you have the chance. It will be a precise indication of a dietary problem. Likewise, an individual with a dietary problem will show diverse sort... <! Anorexia Nervosa papers Numerous past investigations in Anorexia Nervosa have indicated that the purposes behind it are as mind boggling and different as the locales and social orders it happens in, Most examinations have been restricted to the U.S. also, Europe or other similarly financially flourishing nations. Be that as it may, in this paper I wish to concentrate on Anorexia in such Confucianist social orders as Japan or Korea; which in Asia are the most financially fruitful countries cutting-edge. The greater part of the information gave inside this article is gotten from my own nerve racking involvement in Anorexia while living in Korea for a range of 18 years, of which the past 8 were commited to my battle with Anorexia. What's more, the involvement in others with similar issues that I experienced while institutionized in clinical offices. I. Family Values Based on Confucianism: The First Born and the Woman In each family in Korea there is a man centric figure, basically the granddad. And afterward There is the beneficiary obvious dad. And afterward there is the principal conceived child which is to be prepared to be next inline to safeguard the family. The principal conceived child is energetically prepared from various perspectives. He is prepared to most importantly regard his folks and grandparents beyond a shadow of a doubt. There is no space for your own feeling or questions as long as they are alive. There choices are supreme until they state in an unexpected way. This is the most significant factor that a previously conceived child must learn. For instance, there is an old Korean tale about a caring child and his better half who confronted with starvation choose to cook and serve their lone youngster to their folks (to the spouse the inlaws) in light of the fact that the way they see it you just have one dad or mother however kids? You basically can have more if you pick. This kind of reasoning is engraved in the brain. Second, you are instructed to continuously have the option to accomplish the best expectations in everything all that you lock in in, mostly contemplates. You must have the option to b... <! Anorexia Nervosa articles Everyone eats. In any case, as indicated by the human conduct, there are colossal contrasts between individuals. Some eat progressively, some eat less, some put on weight effectively, and different doesn't. What's more, a few people go to such boundaries that they hurt themselves, by eating excessively or excessively little. Thus they may hurt their wellbeing and go to the consideration of specialists. This exploration manages anorexia nervosa. Anorexia nervosa is a dietary problem that typically strikes ladies. Of the 7,000,000 ladies matured 15 to 35 who have a dietary issue, many will kick the bucket from the difficulties of anorexia. Anorexia may not be seen in the beginning periods since it regularly begins as a blameless eating regimen. They regularly become hyperactive on the grounds that they practice hysterically trying to consume calories to get thinner. There are numerous reasons regarding why ladies create anorexia nervosa. One is that it is counting calories taken to a risky outrageous. Another is that cultural weights direct a lady be meager so as to be delightful - the whithered stray look was as of late famous. Be that as it may, what these hypotheses come down to is an issue of control. Whatever else is going on in the anorexic's life, the one thing that she believes she can control is food. Anorexia starts with the ordinary abstaining from excessive food intake that is so much a piece of young person life. About 33% of anorexia victims have been overweight before beginning to consume less calories. In contrast to typical counting calories, which stops when the ideal weight is reached, in anorexia the abstaining from excessive food intake and the loss of weight proceed until the victim is well underneath as far as possible for her age and stature. The small measure of calories that she is taking in might be masked by the amounts of organic product, vegetables and plates of mixed greens that she eats. Additionally, she will frequently practice enthusiastically or take thinning pills to keep her weight low. In addition, despite her own demeanor to eating, she may take an energetic enthusiasm for purchasing food and preparing for other people. ... <! ANOREXIA NERVOSA papers Anorexia Nervosa Models are pretty and dainty and are regularly taken as good examples of accomplishment. Anyway they should be underweight to look great on TV and magazines. So as to be slight, they build up an infection called anorexia nervosa. Despite the fact that anorexia and bulimia are identified with dietary problems, anorexia nervosa has more foundation than bulimia. This article states what anorexia nervosa is and for to what extent the malady has been around in the public arena. There is progressively tan one meaning of anorexia nervosa; be that as it may, all portray a similar issue. Here are a portion of the definitions: Anorexia nervosa is an eating issue that happens when an individual is ridiculously worried about being overweight and in this way eat as meager as could be expected under the circumstances. This condition is both a physical disease and a mental ailment. Hormone changes result from the low weight and low degrees of muscle to fat ratio. In young ladies fe minine cycle stops. Anorexia nervosa can be exceptionally serious sickness, including a danger of death from starvation (Encarta Encyclopedia, Internet). Anorexia nervosa is a turmoil wherein distraction with eating less junk food and slenderness prompts unreasonable weight reduction. The individual may not recognize that weight reduction or confined eating is an issue (www.anorexia.com, Internet). The American Anorexia Nervosa Association characterizes anorexia as a genuine ailment of purposeful self-starvation with significant mental and physical parts. Now that we recognize what anorexia implies, lets describe how this sickness came to be perceptible. We have the information that anorexia nervosa is influencing a more noteworthy number of people. Despite the fact that it was found not very far in the past, anorexia nervosa has been around for a long time. As indicated by Neuman, there is proof of the nearness of an indistinguishable condition that returns from old occasions, some time before the finding was characterized. Afterward, in the Middle Ages, goodness was compared with slenderness. The acceptanc

Workplace Communication Essay Example | Topics and Well Written Essays - 500 words

Working environment Communication - Essay Example They have conveyed their booking about the O-ring’s potential for disappointment yet as the catastrophe would tell, they couldn't send their message across adequately. The dispatch despite everything initiated prompting the blast of the Shuttle only seconds after the dispatch. It turned out to be certain that the Challenger Disaster was a correspondence issue as announced by the discoveries of Roger Commission, the body that was shaped by President Ronald Reagan to examine the blast. The aftereffect of the examination demonstrated that the individuals in the phone gathering from Marshal Space Flight Center had diverse comprehension of the message that the architects were attempting to pass on which is the reason the Shuttle was still propelled in spite of the engineer’s reservation. The Columbia Shuttle flight 107 fiasco may have an alternate situation from the Shuttle Challenger however it despite everything wound up in a debacle simply like its forerunner. The regular guilty party is again miscommunication. Once more, the specialists had communicated their booking about the froth preceding the Columbia dispatch. Be that as it may, they couldn't convey its message to the best possible specialists successfully so the dispatch was still started finishing off with a similar disaster. Both the heartbreaking accounts of Space Shuttle Challenger and Columbia showed me the significance of conveying my message obviously and totally, however I ought to likewise consider if my messages are contacting the target group at an ideal time and opportunity. This story might be interesting however here and there working with senior residents in the workplace can have funny ramifications. I took a mid year work previously and this is the place my experience occurred. Our supervisor would already be able to be considered as a senior resident however he is as yet energetic at work. Once, I was approached to compose a report for a month to month meeting which I cheerfully obliged. I assembled every one of my information at the workplace and told my supervisor that I will have it done continuously and will send

Compiling Essay Topics For Effective Writing and Presentation

Compiling Essay Topics For Effective Writing and PresentationAfter you have written your essay on the topic of negotiation, you will probably want to compile a list of negotiation essay topics that you can use to address the elements that are most critical to the essay. It is also a good idea to do this early in the process so that you can get a head start on compiling the material and coming up with ideas. However, this is not always a necessary step and there are many other areas of writing where you can discuss the topics.Many subject matter experts will suggest that you outline your essay before you actually write it. This allows you to take the necessary steps to compose a great starting point for your essay and an outline for each section of the essay. It is a good idea to write down the major sections of the essay such as introduction, body, main thesis, and conclusion. This helps you organize the material and you may find that some of your ideas do not make it into the body o f the essay because they are simply too scattered.When you are writing a negotiation essay, one of the topics that may come up is negotiating. What are the points that make negotiation interesting? How can you use this topic to advance your own position? In what ways can you change how you represent yourself in a negotiation? You can use negotiation essay topics to help you make this case.Negotiating means that you are using threats or other forms of leverage to get what you want. Of course, if you are in a situation where you feel you are being bullied by the other side, then you may be able to persuade them to give you what you want through such tactics. However, if you are negotiating for something of value that you know they do not want, such as better terms on a lease, then you should be prepared to give up something in return. The initial question then becomes 'what' and it should be the first thing you address. Consider your bargaining tactics and develop the skills needed to be a better negotiator.Perhaps, you will be asked to submit your essay at the time of registration or in the middle of the semester. What do you want to include in your essay? Many students love to provide an overview of their background to the college so that the college can gain a better understanding of the student's academic performance. You can discuss your background, including accomplishments and even the resources you used to earn your degree.Your coursework may be limited and your essays are often given for evaluation purposes. You should think about which points are most important to discuss and outline those points in the essay. Essay writing often leads to essays in the same category and it may be helpful to write up your outlines so that you can continue to improve your essays and make them more useful.Negotiation essay topics can be tailored to suit a specific person. If you are an instructor who wants to discuss strategies for teaching, or if you are a parent who wan ts to consider using negotiation techniques to keep your children out of trouble, then the choices for your essay will vary. In other words, there is no right or wrong essay topic, but you should consider the reasons why it is important to write the essay and try to incorporate those motivations in your essay.Finally, the most important step in all of this is to be prepared and confident that you will be able to write a compelling and impressive essay on the topic of negotiation. You will certainly want to make sure that you have some preliminary work completed before you even start writing and then you will want to make sure that you have thoroughly checked your outline, taken the time to revise your draft, and have read over your essay thoroughly for spelling and grammar errors.

The Awakening By Kate Chopin - 1730 Words

The impalpability of passion is something that causes a person to act on sentiment often times rather than perhaps, more conceptually proper ideals. In many instances, an act of passion is committed to achieve a sense of satisfaction within one’s self. This concept lends itself to the perception that societal influence does not always subjugate that of personal inclination. The feeling that generates this emotion primarily ensues actions that, due to their anomalism, can seem selfish or at times even pathetic. The word pathetic, although often having iniquitous connotation, compatible with synonyms such as worthless or shameful, takes a different turn in the novel The Awakening by Kate Chopin. Protagonist and main character Edna†¦show more content†¦Edna Pontillier however, had very different feelings about this ordeal and through her series of awakenings throughout the novel, embarks on a journey that, for once, allowed her to put her own thoughts and feelings first without considering that of others. The disconnect between Edna and her husband Leonce Pontillier lays an adumbrate backdrop for the events to come from the beginning of the novel. It is evident that Mr. Pontillier is a man quite consumed with appearances and considers Edna, in a term more referenced to the present century, a trophy wife. Neither thoroughly amative nor ardent to her, he appreciates and is proud of the appearance that Edna offers, describing on page 5 how he looked upon Edna as one would look at â€Å"a valuable piece of personal property that has suffered some damage.† One can question however, is Leonce lost in vanity, or simply a man of his time? Mrs. Pontillier, described as being more handsome than beautiful links itself to the masculinity within her; representing the strong ill feelings she dared to feel while being a woman of the late 1800’s. â€Å"In short† says the novel â€Å"Mrs. Pontillier was not a mother-woman† (p.8) On a summer family vacation to the Grand Isle, Edna Pontiller is introduced to a dashing young man by the name of Robert Lebrun. The relationship begins as a simple camaraderie

The Contemporary American Rendition Of Othello By William...

Othello, composed by Shakespeare in 1603, is a standout amongst the most disputable and pertinent plays to both society and people. It investigates themes such as gender equality and Jealousy that are still pervasive today. The film O, on the other hand, is the contemporary American rendition of Othello. It too explores similar notions pertinent to society. At the core of both these texts there are universal themes that make it similar, however, each text has been altered by the composers, William Shakespeare and Tim Blake Nelson, in order to make it germane and engaging for the audience of their times. In Othello, Shakespeare challenges the desires and perspectives put on ladies in the public arena. He endeavours to change the attitude†¦show more content†¦Not just does this represent the inferiority of women to men, it likewise expresses that ladies are seen as a commodity to be given, transported and purchased. Moreover, it highlights the characterisation of Desdemona and how submissive she is. This accentuates that Shakespeare was a man who saw ladies simply the same as a man. His emphasis on gender equality permits viewers to get a look at how ladies are dealt within society and how men ought to treat ladies. He underscores that gender equality should be valued in society. Nelson in the movie O enforces viewers to view women as the same as men. He endeavours to ensure that gender inequality does not happen in society. He emphasises that women have a say in society and men should respect it. This gender equality is predominant in the characterisation of Desdemona. In O Desdemona is depicted as a lady of self-assurance and capacity. This nature of Desdemona is seen when she opposes her dad by saying that her association with Othello is none of your business. High modality is utilised to stress the confidence she has in herself. The scene is also a high angle shot with her father the dominant figure. This exemplifies how defiant women can be. Gender equality can also be seen when O and Dese fight over the handkerchief. The camera is steady and looking straight on. This leads the viewer to the perspective that women are on the same level as men. High modality is also utilised

Korean Pop Music And Its Effects - 1979 Words

For the past 4-5 years I have listened to Korean pop music as my main source of music. Over this time, a lot of changes have happened in the Kpop community but the most outstanding change was how much more popular Korean music has become worldwide. Kpop has been around since the 90’s but has recently become much more popular globally with thanks to the internet and social media. Globalisation and its effects have been amplified extremely by the Internet which has facilitated communications between different groups of people on a global scale. Sites such as Twitter, Facebook and YouTube have allowed Korean artists to reach a new, much larger audience and achieve global success. The surge in the visibility of Korean culture has been coined ‘The Korean Wave’ or ‘Hallyu’ which translated literally means the flow of Korea. The Hallyu wave first began by the spread of Korean dramas being televised in other areas of Asia and continued to grow once Kpop artists began utilising social networking services and in particular YouTube. Much of the Hallyu Wave’s success can be attributed to the video sharing website. YouTube has allowed Korean (and other nationalities) artists to post their content online and be viewed by the larger overseas audience. As of 2012, the most viewed video that has ever been uploaded to YouTube is a Korean pop music video, holding a world record for the achievement and now totalling over 1 billion views. Unless you’ve been living under a rock for the last 3Show MoreRelatedMusic Videos : The Video, You And I, By F. N. B Pop Music1210 Words   |  5 Pagesthe same token, visually stunning music videos al so captured fans from across the globe. 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Their images, clothing styles, music, and personalities all catered and appealed to the teens. For example, groups like H.O.T and Sechs Kies embraced rebellious identities and criticized the South Korean education system. At the same time, they released dance music along to clarifyRead MoreK Pop s Shady Business Secret Essay1239 Words   |  5 PagesK-pop s Shady Business Secret The Korean pop or K-pop industry over the last decade has experienced a major increase in popularity that has made it a billion dollar competition for foreign music industries. They are especially known for their extravagant music videos and visual aesthetics, which have attracted worldwide followings. K-pop companies are also infamous for being brutally strict on training and restrictions for their trainees and idols. 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Statement of the problem D. Definition of terms Anime addicton A. Reason of anime addiction 1.manga 2.video games 3.movies 4. anime series . B. positive effect of anime

A Land Far, Far Away Essay Example For Students

A Land Far, Far Away Essay When I was a small child, my mother told me about the incredible history of a foreign country that claimed to have countless opportunities to live and work. She told me that you could live in that country, and work hard so that my future was in that country and to succeed. That country, where I currently call home, is the United States of America. Each year my mother went to the United States to buy merchandise to sell in my native country of Ecuador, in a city near the coast called Portoviejo (the city I was born in). While my parents went to America, my grandparents cared for me; they are my second parents, and they gave me a lot of love and affection. A few weeks after my grandpahad passed away,I still felt incredibly sad, but I soon found out that my life would change forever. My mother called me. It was raining, and I was once again nervous of what she was going to say. She told me thatshe was going to the country that she always told me about. My mother told me that she did not have the necessary resources to ensure that we went; she only had enough money for her. She promised me that she would get me into the United States, but with the condition that I would improve in school, includingpassing eighth grade. At the time, I was a young boy who had neither good nor bad grades, and I didn’t know if I would ever see the â€Å"land of opportunity. † The time passed by, and I knew that in a week my mother would go to the United States without me. With her,I was able to go out a lot, and Imademany close friends. That day arrived, and she gave me a memory that I liked, a poem, (the best poem that a mother could give to a child). I started to cry. Even though my mother just left,I was sad and torn apart, and missed her immensely. From that moment on, I felt something change in my body that could not stop me. After not seeing my mom and living with my grandma for two years, I got the call of lifetime: it was my mom, saying that I was moving to the U. S. I managed to improve my grades in five subjects. Many teachers were amazed when my grades rose, and they began to congratulate me; I felt very happy. It was my last week in Ecuador, and I imagined that as I was making my way to a beautiful country. The day came and I got to travel alone (it was my first time traveling alone), got on the plane, and I felt joy and great sorrow, joy to see my mother again, but the great sadness of leaving my grandparents. It was night, and as I was coming to the United States, I only saw many lights were very bright and saw something white. It was snow, something that I always wanted to touch and feel. The buildings were twice the size of the buildings in my country, and then I remembered the twin towers and the terrible event that happened there. To be successful, you have to work hard and succeed. I want to be a successful person, and become someone in this world and for my mother to be proud of me. This is a life lesson, you do not know if tomorrow you will be with your family or not; you have to appreciate the people who are around you and know what you have. Since I arrived, I decided to excel in my studies and have more respect for teachers and other adults. I think Im doing the right thing for my family and me.

Julius Caesar Essays (412 words) - Ancient Rome, 1st Millennium BC

Julius Caesar William Shakespeare writes the Tragedy of Julius Caesar. This tragic play is based on historical facts of the life of Julius Caesar. It displays the events before his death such as his conquest over Pompey's armies and his coronation to be king and after his death. Furthermore, this play describes the minds and motives of Caesar's assassins. He gives a description of Cassius that serves as a prediction on his choices regarding Cassius. In addition, my choices would differ from those of Caesar's if I was the exalted ruler. First, in Julius Caesar, Caesar describes Cassius in the first act and he made choices based on his description. Caesar referred to Cassius as having "a lean and hungry look [and] he thinks too much, such men are dangerous". What this means is that Cassius exhibits no signs of cheerfulness and he is not "gamesome", indicating that he may be a threat to Caesar. However, he describes Cassius as a one who "reads much, a great observer, and looks quite through the deeds of men". Moreover, Caesar felt that such a man could not be fully trusted and felt Cassius had little loyalty to him. Next, I predict Caesar will make thoughtless choices regarding Cassius. In the play, I predict that Caesar will keep an eye on Cassius and avoid him as much as possible. Nonetheless, these projected actions will still seal his fate later in the play. Some indications of his imminent demise were the angry talk of the tribunes and the warning given by the soothsayer: "Beware the Ides of March". Furthermore, I predict that Caesar will be stabbed to death by "augurers" near the Tiber River while protecting Calpurnia. Finally, I would do things in a different way if I were the exalted ruler of ancient Rome. I would not have trusted Cassius as much as Caesar did because of his "dangerous looks" such as his facial expression. As the exalted ruler of the Roman Em-pire, I would investigate many people whom I have suspicions on. By doing these inves-tigations on people, I can lower my chances of being assassinated. Moreover, unlike Caesar, I would consider some warnings from people such as the soothsayer. In conclusion, judgements made by Caesar about Cassius that predicted the future of the play. Caesar feels suspicious about Cassius and sees him as a danger to his power. I predict that various signs, such as the warning by the soothsayer and the dialogue of the tribunes, will contribute to a future danger awaiting Caesar. In addition, the events that followed would have been entirely different if I had been the exalted ruler.

Acadia National Park essays

Acadia National Park essays At first, Acadia National Park was only a monument. In 1913, President Woodrow Wilson named 6,000 acres Sieur de Monts National Monument. Soon, many citizens donated time and money to the park. In 1919 President Wilson signed an act changing the monument to a national park. The main reason that Acadia National Park was established was to protect the areas scenic values, the rocky coast, its islands, and the plants and wildlife. This park is unusual because it wasnt made on public lands, or bought with public funding. It was made because of the money the private citizens donated. John D Rockefeller Jr. alone built the carriage roads and bought the park more than 11,000 acres, which is about one third of the Acadia National Park has 35,000 acres of rocky seacoast, islands, forests, mountains, and lakes. Everything is open to the public to enjoy. there are over 120 miles of hiking trails. The trails range from short, sea level walks, to the extremely steep precipice trail. The trails are all connected together, so the hikers can visit a few mountains peaks in one trip. 57 miles of roads are open to bicyclists, horseback riders, and carriages. There are also 27 miles set aside for a scenic drive through Acadia has a huge history. The name Acadia was French before it turned into English and then American. Its first name was Mount Desert Island, named by the French explored, Champlain. Champlain had the first boating mishap on the rocky shoreline. He was sailing his boat near the shore when his got stuck on the rocks. Until the Civil War, This shorelines ledges and fog were hazards to sailors. Fours automatic lighthouses now run in the area of Egg Rock, Bass Harbor Head, Baker Island, and Great ...

Systems and Operations- Critical Evaluation of Relevant Issues Essay

Systems and Operations- Critical Evaluation of Relevant Issues - Essay Example Moreover, in the year 2002, Gerard J. Arpey became the Chief Operating Officer as well as the President of American Airlines. American Airlines under the leadership of Gerard J. Arpey became part of the ‘oneworld’, one of the foremost global alliances in the field of airlines (American Airlines, Inc., 2008). Current Operational Areas of American Airlines Product & Service Design According to Moritz, product & service design is â€Å"the design of the overall practices of a service as well as the design of the process along with different strategies in order to provide a particular service†. In addition, it is a process which covers the four D’s, that is define, discover, develop and deliver. It is all about recognising the market, client and organisation, developing ideas, transform them into practicable solutions and eventually to help in implementing them (Moritz, 2005). The operational areas of American Airlines includes such as product & service designs , supply chain management system, planning inventory control, resource planning and quality management among others. The product that the organisation deals basically with is the airline service and also it produces numerous service designs to its wide range of customers worldwide. One of the most significant services of American Airlines is their introduction of Admirals Club which is especially intended for their travelling customers (American Airlines Inc, 2008). Admirals Club as a quality feature offers an expansive range of facilities such as individual workstations, computers with internet facility; extensive distance telephones, children’s rooms, music rooms and a wide variety of sweet and flavourful snacks... According to the research findings with the advent of increased use of technology and competition in the airlines industry, there is a need of a very practical applicable theory that is maximising revenue and reducing cost for every organisation of the airlines industries in order to survive in today’s business environment. In the paper, the current operational areas of American Airlines that include the various operational fields like the organisations product and service design, supply chain management processes, planning inventory control processes, resource planning policies and quality management among others are focused. And also an analytical discussion has been made regarding these key processes within the operational areas of the organisation that significantly contributes to the competitive advantage. Also the various organisational, management and technical issues surrounding the information system has been elaborately discussed. In this connection, certain instruct ions were also recommended regarding the improvement to the specialised areas of the organisation which might eventually prove beneficiary as well successful for American Airlines. The concept of knowledge management is also highlighted and ultimately it can play a significant role or position within the organisation in alleviating the prevalent issues. Moreover, the ethical concerns and the security threats to the recommended information systems is also highlighted and certain controllable factors were also prescribed in order to cope up with several issues and threats that are prevailing within the organisation.

Current issues in financial reporting Essay Example | Topics and Well Written Essays - 1250 words - 1

Current issues in financial reporting - Essay Example 549-586). This paper explains the importance of financial reporting in organization, and gives the reasons for and against capitalising human resources in the financial statements of a company. Discussion Financial reporting entails communication of useful financial information for making credit, investment and other decisions in business. Reports to the stockholders on quarterly and annual basis, financial statement notes, prospectuses on issuance of security and common stock, and the external financial statements, like the income statements, stockholder’s equity statement, cash flow statements and the statements on stock equity. Financial reporting enhances delivery of information to the shareowners and lenders in business; it is usually component of the essential contract between them since they have the right to know the spending of their money and the returning profits (Ballweiser, 2004). In UK, big changes in financial reporting are under the Financial Services sector. T he Accounting Standards Board, ASB issued exposure drafts that detail the proposals for financial reporting in UK. ... The demand for more transparency ensures growth to the interests of an organization in order to meet such demand constructively. The organization will, therefore, have a strategic value in clarifying for the critical performance as well as internal management of the organization communication. This leads to effective allocation of capital in the organization, and critical in achieving a special attention within the accounting research. Reason for Capitalizing Human Resource in UK Human capital forms the main asset in service companies. The success of an organization can be rated depending on the  employees and customers they retain (Francis, Lafond, Olsson, & Schipper 2005, p. 295-327). Several studies on human resource measurement aim at providing the management of any organization with the traditional financial statements, as well as additional information. The intangible asset from many organizations is more critical than the tangible assets. Intangible assets comprise of the su ccess factors needed for maximization of profits and continual survival of the organization. Like human resource, while the intangible assets comprise of the fixed assets like property. The financial information from the financial statements is considered incomplete when they fail to cover and account the human resources. Financial measuring and reporting by businesses in UK enhance the management and evaluation of people’s performance. This ensures greater transparency on value creation through effective policies and practices that benefit stakeholders and the organization at large. The management of people by an organization impacts their performance. The feature of good managerial practices

Investigating mass surveillance

Investigating mass surveillance (How) Is Big Brother Watching Us? Big Brother is a fictional character in George Orwells dystopian novel Nineteen Eighty-Four, which tells the story of one mans attempt to rebel against the totalitarian state in which he lives. In the society that Orwell describes, everybody lives under complete twenty-four hour surveillance by the governing authorities. Since the publication of Nineteen Eighty-Four, the phrase Big Brother has entered the English language, to describe any attempts by governments to use mass surveillance.[1] The main surveillance tool described in Orwells novel is the imaginary telescreen, a cross between a television and a security camera[2], and in the past decade growing comparisons have been drawn between the imaginary telescreen and the Internet-connected personal computer that is in many modern homes. The purpose of this essay is to investigate the mass surveillance of Internet communications carried out by western governments today, and the technologies used to carry out that surveillance. The essay will first look at the current privacy landscape in the USA, the European Union, and the UK, in terms of policies and legislation. Then it will discuss some of the most interesting technical methods used to carry out mass Internet communications surveillance. The terrorist attacks on New Yorks World Trade Centre, of September 11th 2001, heralded the dawn of a new global political era. Following those atrocities and subsequent attacks in Egypt, the United Kingdom, Spain, Bali, Russia, Morocco, and Saudi Arabia, governments around the world have responded by tightening existing legislation and creating new anti-terror laws. Many of the countries that changed their laws to combat terrorist threats also increased the powers of their law enforcement and national security organisations to perform communications surveillance and carry out electronic data search and seizure. The Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001, more commonly known as The Patriot Act, was signed into law less than seven weeks after the Twin Towers attacks. The Act is organised into ten titles, including Title II: Enhanced Surveillance Procedures, and Title IX: Improved intelligence. The Patriot Act, which was Americas legislative response to the September 11th attacks, hugely increased American law enforcement and national security services authority both in the USA and abroad. The Patriot Act strengthened immigration, banking, and money laundering laws. The Patriot Act also amended the Foreign Intelligence Surveillance Act (FISA) of 1978, which includes subchapters covering electronic surveillance and trap and trace devices (used to capture non-content information regarding electronic communication). FISA was also expanded by the Intelligence Reform and Terrorism Prevention Act of 2004.[3] In July of 2002 the European Union passed the Directive on Privacy and Electronic Communications'[4]. This directive was amended in 2005 by the Electronic communications: personal data protection rules and availability of traffic data for anti-terrorism purposes directive.[5] These directives will lead to European telecom firms being required to store data regarding the time and duration of all fixed line, internet, and mobile telephone calls, the location of mobile telephone calls, and details of all internet connections and e-mail messages (although e-mail content is not recorded). The UK government was the prime mover in lobbying for this directive, stating that data was the golden thread in terrorist investigations.[6] We have seen then that current privacy landscape has been heavily influenced by the changing global political situation with specific reference to global terrorism. We know that legislation exists that allows western governments to carry out mass surveillance, but what do they actually do and how do they do it? Mass surveillance can take many forms, including physical surveillance in the form of identity systems, audio, video, RFID and satellite surveillance. Data surveillance can also be used in the areas of electronic commerce and public records.[7] For the purpose of this essay we will look specifically at some of the most interesting technologies (allegedly) used by government organisations to carry out mass surveillance of Internet communications. One of the most infamous alleged mass electronic communication surveillance technologies is ECHELON, a top-secret Anglo-American collaboration tasked with gathering signals intelligence around the world. Although its existence is still officially denied the European Parliament commissioned a report in 2001 entitled on the existence of a global system for the interception of private and commercial communications (ECHELON interception system)'[8]. They were sufficiently convinced of ECHELONs capabilities to recommend that European citizens and businesses should routinely encrypt their communications in order to maintain privacy[9]. The idea of the ECHELON network was supposedly agreed between London and Washington as far back as 1948, although its existence was not brought to public attention until the publication of New Statesman article in 1988. ECHELONs capabilities are the subject of much debate; some estimates report that it can sift through 90% of Internet traffic, though the European Union found that the technical capabilities of the system are probably not nearly as extensive. The hardware used to collect the information also remains something of a mystery, with some sources claiming that ECHELON controls over one hundred satellites and dozens of ground based listening stations. Others point out that very little (

Spelling and Differently: Kinship, Deception and Challenges :: Alice Munro Spelling Differently

Alice Munro's Spelling and Differently:  Ã‚   Kinship, Deception and Challenges  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚        Ã‚  Ã‚  Ã‚   The two short stories Spelling and Differently, written by Alice Munro, deal with female relationships.   These relationships paint a vivid picture of the kinship, deception, challenges, and associations that affect friends and family as they journey through life. "Spelling" is about the relationship of two women, Rose and Flo. Although from the outset the relationship between Rose and Flo is not clear, near the end the reader has no doubt they are mother and daughter.   Munro illustrates the awkward relationship between a parent and a child and the difficult problems that face children as their parents age.   After visiting the county home in an attempt to find a place for Flo to live,   "Rose spoke of the view and the pleasant rooms.   Flo looked angry; her face darkened and she stuck out her lip.   Rose handed her a mobile she had bought for 50 cents in the County Home crafts centre.... Stick it up your arse, said Flo" (Oates 151).   The reader sees no affection between the two.   In fact, the tone of the story illustrates a lack of acceptance and even disappointment by Flo and shows that there has always been a distance between the two. The title is derived from a patient Rose met at the nursing home whose only communication was spelling words.   After meeting this patient, Rose dreamed that Flo was in a cage and spelling words like the old patient she met in the nursing home.   Rose tells Flo about her visit to the nursing home and is obviously trying to influence Flo into going to the home.   Flo is suffering from some sort of dementia, perhaps Alzheimer's.  Ã‚   In this story the author doesn't tell the characters ages, Rose's occupation,   and other information necessary to develop a clear picture.   Instead, Munro makes the reader use more of ones imagination in developing the story.   Although Munro is not explicit, the story is about an unhappy relationship between a daughter and mother. In the story the narrator flashes back to a time in Rose's career when she was in a play with her breast exposed.   Flo showed her displeasure by writing her a letter that said "shame" and adding that if her father was not already dead, he would wish that he was (Oates 154).   Yet, the reader feels that Rose is still trying to earn her mother's respect and   love. Spelling and Differently: Kinship, Deception and Challenges :: Alice Munro Spelling Differently Alice Munro's Spelling and Differently:  Ã‚   Kinship, Deception and Challenges  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚        Ã‚  Ã‚  Ã‚   The two short stories Spelling and Differently, written by Alice Munro, deal with female relationships.   These relationships paint a vivid picture of the kinship, deception, challenges, and associations that affect friends and family as they journey through life. "Spelling" is about the relationship of two women, Rose and Flo. Although from the outset the relationship between Rose and Flo is not clear, near the end the reader has no doubt they are mother and daughter.   Munro illustrates the awkward relationship between a parent and a child and the difficult problems that face children as their parents age.   After visiting the county home in an attempt to find a place for Flo to live,   "Rose spoke of the view and the pleasant rooms.   Flo looked angry; her face darkened and she stuck out her lip.   Rose handed her a mobile she had bought for 50 cents in the County Home crafts centre.... Stick it up your arse, said Flo" (Oates 151).   The reader sees no affection between the two.   In fact, the tone of the story illustrates a lack of acceptance and even disappointment by Flo and shows that there has always been a distance between the two. The title is derived from a patient Rose met at the nursing home whose only communication was spelling words.   After meeting this patient, Rose dreamed that Flo was in a cage and spelling words like the old patient she met in the nursing home.   Rose tells Flo about her visit to the nursing home and is obviously trying to influence Flo into going to the home.   Flo is suffering from some sort of dementia, perhaps Alzheimer's.  Ã‚   In this story the author doesn't tell the characters ages, Rose's occupation,   and other information necessary to develop a clear picture.   Instead, Munro makes the reader use more of ones imagination in developing the story.   Although Munro is not explicit, the story is about an unhappy relationship between a daughter and mother. In the story the narrator flashes back to a time in Rose's career when she was in a play with her breast exposed.   Flo showed her displeasure by writing her a letter that said "shame" and adding that if her father was not already dead, he would wish that he was (Oates 154).   Yet, the reader feels that Rose is still trying to earn her mother's respect and   love.

Outline of Chapter 2

chapter 2 chapter outline module 5 Neurons: The Basic Elements of Behavior The Structure of the Neuron How Neurons Fire Where Neurons Connect to One Another: Bridging the Gap Neurotransmitters: Multitalented Chemical Couriers module 6 module 7 The Brain The Nervous System and the Endocrine System: Communicating within the Body The Nervous System The Endocrine System: Of Chemicals and GlandsStudying the Brain’s Structure and Functions: Spying on the Brain The Central Core: Our â€Å"Old Brain† The Limbic System: Beyond the Central Core The Cerebral Cortex: Our â€Å"New Brain† Neuroplasticity and the Brain The Specialization of the Hemispheres: Two Brains or One? Exploring Diversity: Human Diversity and the Brain Try It! Assessing Brain Lateralization The Split Brain: Exploring the Two Hemispheres Becoming an Informed Consumer of Psychology: Learning to Control Your Heart—and Mind—through Biofeedback Psychology on the Web The Case of . . . The Fallen Athlete Full Circle: Neuroscience and Behavior 46Muscular System: Muscle MetabolismThe Deepest Cut Wendy Nissley carried her two-year-old daughter, Lacy, into O. R. 12 at Johns Hopkins Hospital to have half of her brain removed. Lacy suffers from a rare malformation of the brain, known as hemimegalencephaly, in which one hemisphere grows larger than the other. The condition causes seizures, and Lacy was having so many—up to forty in a day—that at an age when other toddlers were trying out sentences, she could produce only a few language-like sounds. As long as Lacy’s malformed right hemisphere was attached to the rest of her brain, it would prevent her left hemisphere from functioning normally.So Lacy’s parents had brought her to Johns Hopkins for a hemispherectomy, which is probably the most radical procedure in neurosurgery. (Kenneally, 2006, p. 36) neuroscience and behavior It took nearly a day, but the surgery to remove half of Lacy’s brain wa s a success. Within a few months, Lacy was crawling and beginning to speak. Although the long-term effects of the radical operation are still unclear, it brought substantial improvement to Lacy’s life. The ability of surgeons to identify and remove damaged portions of the brain is little short of miraculous. The greater miracle, though, is the brain itself.An organ roughly half the size of a loaf of bread, the brain controls our behavior through every waking and sleeping moment. Our movements, thoughts, hopes, aspirations, dreams—our very awareness that we are human—all depend on the brain and the nerves that extend throughout the body, constituting the nervous system. Because of the importance of the nervous system in controlling behavior, and because humans at their most basic level are biological beings, many researchers in psychology and other fields as diverse as computer science, zoology, and medicine have made the biological underpinnings of behavior thei r specialty.These experts collectively are called neuroscientists (Beatty, 2000; Posner & DiGirolamo, 2000; Gazzaniga, Ivry, & Mangun, 2002; Cartwright, 2006). Psychologists who specialize in considering the ways in which the biological structures and functions of the body affect behavior are known as Behavioral neuroscientists Psychologists who specialize in behavioral neuroscientists (or biopsychologists). They seek to answer sevconsidering the ways in which the eral key questions: How does the brain control the voluntary and involunbiological structures and functions tary functioning of the body?How does the brain communicate with other of the body affect behavior. parts of the body? What is the physical structure of the brain, and how does this structure affect behavior? Are psychological disorders caused by biological factors, and how can such disorders be treated? As you consider the biological processes that we’ll discuss in this chapter, it is important to keep in min d why behavioral neuroscience is an essential part of psychology: our understanding of human behavior requires knowledge of the brain and other parts of the nervous system.Biological factors are central to our sensory experiences, states of consciousness, motivation and emotion, development throughout the life span, and physical and psychological health. Furthermore, advances in behavioral neuroscience have led to the creation of drugs and other treatments for psychological and physical disorders. In short, we cannot understand behavior without understanding our biological makeup (Plomin, 2003a; Compagni & Manderscheid, 2006; Plomin et al. , 2008). 47 looking ahe ad module 5 Neurons The Basic Elements of Behavior learning outcomes 5. 1 Explain the structure of a neuron.The nervous system is the pathway for the instructions that permit our bodies to carry out everyday activities such as scratching an itch as well as more remarkable skills like climbing to the top of Mount Everest. He re we will look at the structure and function of neurons, the cells that make up the nervous system, including the brain. 5. 2 Describe how neurons fire. 5. 3 Summarize how messages travel from one neuron to another. 5. 4 Identify neurotransmitters. The Structure of the Neuron LO 1 Playing the piano, driving a car, or hitting a tennis ball depend, at one level, on exact muscle coordination.But if we consider how the muscles can be activated so precisely, we see that there are more fundamental processes involved. For the muscles to produce the complex movements that make up any meaningful physical activity, the brain has to provide the right messages to them and coordinate those messages. Such messages—as well as those which enable us to think, remember, and experience emotion—are passed through specialized cells called neurons. Neurons Nerve cells, the basic Neurons, or nerve cells, are the basic elements of the nervous system. Their elements of the nervous system. uan tity is staggering—perhaps as many as 1 trillion neurons throughout Dendrites A cluster of fibers at the body are involved in the control of behavior (Boahen, 2005). one end of the neuron that receives messages from other neurons. Although there are several types of neurons, they all have a similar strucAxon The part of the neuron that ture, as illustrated in Figure 1. In contrast to most other cells, however, carries messages destined for other neurons have a distinctive feature: the ability to communicate with other neurons. cells and transmit information across relatively long distances.Many of the body’s neurons receive signals from the environment or relay the nervous system’s messages to muscles and other target cells, but the vast majority of neurons communicate only with other neurons in the elaborate information system that regulates behavior. As you can see in Figure 1, a neuron has a cell body with a cluster of fibers called dendrites at one end. Thos e fibers, which look like the twisted Remember that Dendrites branches of a tree, receive messages from other neurons. On the opposite Detect messages from other of the cell body is a long, slim, tubelike extension called an axon.The axon neurons; Axons carry signals carries messages received by the dendrites to other neurons. The axon is conAway from the cell body. siderably longer than the rest of the neuron. Although most axons are several s tudy aler t 48 Chapter 2 neuroscience and behavior Dendrites Terminal buttons Cell body M o ec vem tric ent of al i mpu lse el Myelin sheath Axon (inside myelin sheath) Figure 1 The primary components of the specialized cell called the neuron, the basic element of the nervous system (Van De Graaff, 2000).A neuron, like most types of cells in the body, has a cell body and a nucleus, but it also contains structures that carry messages: the dendrites, which receive messages from other neurons, and the axon, which carries messages to other neuron s or body cells. In this neuron, as in most neurons, the axon is protected by the sausagelike myelin sheath. What advantages does the treelike structure of the neuron provide? millimeters in length, some are as long as three feet. A xons end in small bulges called terminal buttons, which send messages to other neurons.The messages that travel through a neuron are electrical in nature. Although there are exceptions, those electrical messages, or impulses, generally move across neurons in one direction only, as if they were traveling on a one-way street. Impulses follow a route that begins with the dendrites, continues into the cell body, and leads ultimately along the tubelike extension, the axon, to adjacent neurons. To prevent messages from short-circuiting one another, axons must be insulated in some fashion (just as electrical wires must be insulated).Most axons are insulated by a myelin sheath, a protective coating of fat and protein that wraps around the axon like links of saus age. Terminal buttons Small bulges at the end of the axons that send messages to other neurons. Myelin sheath A protective coat of fat and protein that wraps around the axon. All-or-none law The rule that neurons are either on or off. Resting state The state in which there is a negative electrical charge of about 70 millivolts within a neuron. s tudy aler t Think of a neuron as a sausage, and the myelin sheath as the case around it.LO 2 How Neurons Fire Like a gun, neurons either fire—that is, transmit an electrical impulse along the axon—or don’t fire. There is no in-between stage, just as pulling harder on a gun trigger doesn’t make the bullet travel faster. Similarly, neurons follow an all-or-none law: they are either on or off, with nothing in between the on state and the off state. Once there is enough force to pull the trigger, a neuron fires. Before a neuron is triggered—that is, when it is in a resting state—it has a negative electri cal charge of about 70 millivolts.When a message arrives at a neuron, gates along the cell membrane open briefly to allow positively charged ions to rush in at rates as high as 100 million ions per second. The sudden arrival of these positive ions causes the charge within the nearby part of the cell to change momentarily from negative to positive. When the positive charge reaches a critical level, the â€Å"trigger† is pulled, and an electrical impulse, known as an action potential, travels along the axon of the neuron (see Figure 2). psych 2. 0 www. mhhe. com/psychlife Neurons 49 Module 5 neurons: the basic elements of behaviorFigure 2 Movement of the action potential across the axon. Just before Time 1, positively charged ions enter the cell membrane, changing the charge in the nearby part of the neuron from negative to positive and triggering an action potential. The action potential travels along the axon, as illustrated in the changes occurring from Time 1 to Time 3 (fro m top to bottom in this drawing). Immediately after the action potential has passed through a section of the axon, positive ions are pumped out, restoring the charge in that section to negative.Time 1 Voltage Time 2 ++ +++ – – – – – – Time 3 Voltage Voltage Positive charge Negative charge Direction of impulse Action potential An electric nerve impulse that travels through a neuron when it is set off by a â€Å"trigger,† changing the neuron’s charge from negative to positive. Mirror neurons Neurons that fire when a person enacts a particular behavior and also when a person views others’ behavior. The action potential moves from one end of the axon to the other like a flame moving along a fuse.Just after an action potential has occurred, a neuron cannot fire again immediately no matter how much stimulation it receives. It is as if the gun has to be reloaded after each shot. Eventually, though, the neuron is ready to fire o nce again. Neurons differ not only in terms of how quickly an impulse moves along the axon but also in their potential rate of firing. Some neurons are capable of firing as many as a thousand times per second; others fire at much slower rates. The intensity of a stimulus determines how much of a neuron’s potential firing rate is reached.A strong stimulus, such as a bright light or a loud sound, leads to a higher rate of firing than a less intense stimulus does. Thus, even though all impulses move at the same strength or speed through a particular axon—because of the all-or-none law—there is variation in the frequency of impulses, providing a mechanism by which we can distinguish the tickle of a feather from the weight of someone standing on our toes. Although all neurons operate through the firing of action potentials, there is significant specialization among different types of neurons.For example, in the last decade, neuroscientists have discovered the existen ce of mirror neurons, neurons that fire not only when a person enacts a particular behavior, but also when a person simply observes another individual carrying out the same behavior (Lepage & Theoret, 2007; Schulte-Ruther et al. , 2007). 50 Chapter 2 neuroscience and behavior Mirror neurons may help explain how (and why) humans have the capacity to understand others’ intentions. Specifically, mirror neurons may fire when we view others’ behavior, helping us to predict what their goals are and what hey may do next (Oberman, Pineda, & Ramachandran, 2007; Triesch, Jasso, & Deak, 2007). Mirror neurons may help explain how (and why) humans have the capacity to understand others’ intentions. LO 3 Where Neurons Connect to One Another: Bridging the Gap Synapse The space between two If you have looked inside a computer, you’ve seen that each part is physically connected to another part. In contrast, evolution has produced a neural transmission system that at some points has no need for a structural connection between its components.Instead, a chemical connection bridges the gap, known as a synapse, between two neurons (see Figure 3). The synapse is the space between two neurons where the axon of a sending neuron 1 Neurotransmitters are produced and stored in the axon. neurons where the axon of a sending neuron communicates with the dendrites of a receiving neuron by using chemical messages. 2 If an action potential arrives, the axon releases neurotransmitters. 3 Neurotransmitters travel across the synapse to receptor sites on another neuron’s dendrite. Axon Axon Synapse Dendrite Synapse Neurotransmitter Neurotransmitter Synapse Receptor siteReceptor site 4 When a neurotransmitter fits into a receptor site, it delivers an excitatory or inhibitory message. If enough excitatory messages are delivered, the neuron will fire. A Neurotransmitter Dendrite B Figure 3 (A) A synapse is the junction between an axon and a dendrite. The gap between the axon and the dendrite is bridged by chemicals called neurotransmitters (Mader, 2000). (B) Just as the pieces of a jigsaw puzzle can fit in only one specific location in a puzzle, each kind of neurotransmitter has a distinctive configuration that allows it to fit into a specific type of receptor cell (Johnson, 2000).Why is it advantageous for axons and dendrites to be linked by temporary chemical bridges rather than by the hard wiring typical of a radio connection or telephone hookup? Module 5 neurons: the basic elements of behavior 51 communicates with the dendrites of a receiving neuron by using chemical messages (Fanselow & Poulos, 2005; Dean & Dresbach, 2006). carry messages across the synapse to When a nerve impulse comes to the end of the axon and reaches a terminal the dendrite (and sometimes the cell button, the terminal button releases a chemical courier called a neurotransbody) of a receiver neuron. mitter.Neurotransmitters are chemicals that carry messages across the Excitatory messages Chemical synapse to a dendrite (and sometimes the cell body) of a receiving neuron. messages that make it more likely that a receiving neuron will fire and an The chemical mode of message transmission that occurs between neurons is action potential will travel down its axon. strikingly different from the means by which communication occurs inside Inhibitory messages Chemical neurons: although messages travel in electrical form within a neuron, they messages that prevent or decrease the move between neurons through a chemical transmission system. ikelihood that a receiving neuron will fire. There are several types of neurotransmitters, and not all neurons are Reuptake The reabsorption of capable of receiving the chemical message carried by a particular neuneurotransmitters by a terminal button. rotransmitter. In the same way that a jigsaw puzzle piece can fit in only one specific location in a puzzle, each kind of neurotransmitter has a distinctive configuration t hat allows it to fit into a specific type of receptor site on the receiving neuron (see Figure 3B). It is only when a neurotransmitter fits precisely into a receptor site that successful chemical communication is possible.If a neurotransmitter does fit into a site on the receiving neuron, the chemical message it delivers is basically one of two types: excitatory or inhibitory. Excitatory messages make it more likely that a receiving neuron will fire and an action potential will travel down its axon. Inhibitory messages, in contrast, do just the opposite; they provide chemical information that prevents or decreases the likelihood that the receiving neuron will fire. Because the dendrites of a neuron receive both excitatory and inhibitory messages simultaneously, the neuron must integrate the messages by using a kind of chemical calculator.Put simply, if the excitatory messages (â€Å"fire! †) outnumber psych 2. 0 the inhibitory ones (â€Å"don’t fire! †), the neu ron fires. In contrast, if the inhibitory www. mhhe. com/psychlife messages outnumber the excitatory ones, nothing happens, and the neuron remains in its resting state (Mel, 2002; Flavell et al. , 2006). If neurotransmitters remained at the site of the synapse, receiving neurons would be awash in a continual chemical bath, producing constant stimulation or constant inhibition of the receiving neurons—and effective communication across the synapse would no longer be possible.To solve this problem, neurotransmitters are either deactivated by enzymes or—more commonly— reabsorbed by the terminal button in an example of chemical recycling called reuptake. Like a vacuum cleaner sucking up dust, neurons reabsorb the neurotransmitters that are now clogging the synapse. All this activity Messages Traveling between Neurons occurs at lightning speed (Helmuth, 2000; Holt & Jahn, 2004). Neurotransmitters Chemicals that LO 4 Neurotransmitters: Multitalented Chemical Couriers Neurotransmitters are a particularly important link between the nervous system and behavior.Not only are they important for maintaining vital brain and body functions, a deficiency or an excess of a neurotransmitter can produce severe behavior disorders. More than a hundred chemicals have been found to act as neurotransmitters, and neuroscientists believe that more may ultimately be identified (Penney, 2000; Schmidt, 2006). Neurotransmitters vary significantly in terms of how strong their concentration must be to trigger a neuron to fire. Furthermore, the effects of a particular neurotransmitter vary, depending on the area of the nervous system in 52 Chapter 2 neuroscience and behavior Dopamine Pathways Name Acetylcholine (ACh)Location Brain, spinal cord, peripheral nervous system, especially some organs of the parasympathetic nervous system Brain, spinal cord Brain, spinal cord Effect Excitatory in brain and autonomic nervous system; inhibitory elsewhere Function Muscle movement, c ognitive functioning Glutamate Gamma-amino butyric acid (GABA) Excitatory Main inhibitory neurotransmitter Memory Eating, aggression, sleeping Serotonin Pathways Dopamine (DA) Brain Inhibitory or excitatory Muscle disorders, mental disorders, Parkinson’s disease Sleeping, eating, mood, pain, depression Pain suppression, pleasurable feelings, appetities, placebosSerotonin Brain, spinal cord Inhibitory Endorphins Brain, spinal cord Primarily inhibitory, except in hippocampus Figure 4 Some major neurotransmitters. which it is produced. The same neurotransmitter, then, can act as an excitatory message to a neuron located in one part of the brain and can inhibit firing in neurons located in another part. (The major neurotransmitters and their effects are described in Figure 4. ) One of the most common neurotransmitters is acetylcholine (or ACh, its chemical symbol), which is found throughout the nervous system. ACh is Michael J.Fox, who suffers from Parkinson’s disease, lik e Muhammad Ali, has become a strong advocate for research into the disorder. The pair is seen here asking Congress for additional funds for Parkinson’s research. Module 5 neurons: the basic elements of behavior 53 involved in our every move, because—among other things—it transmits messages relating to our skeletal muscles. ACh is also involved in memory capabilities, and diminished production of ACh may be related to Alzheimer’s disease (Mohapel et al. , 2005). Another major neurotransmitter is dopamine (DA), which is involved in movement, attention, and learning.The discovery that certain drugs can have a significant effect on dopamine release has led to the development of effective treatments for a wide variety of physical and mental ailments. For instance, Parkinson’s disease, from which actor Michael J. Fox suffers, is caused by a deficiency of dopamine in the brain. Techniques for increasing the production of dopamine in From the perspective o f . . . A Health Care Provider How might your understanding of the nervous system help you explain the symptoms of Parkinson’s disease to a patient with the disorder?Parkinson’s patients are proving effective (Kaasinen & Rinne, 2002; Willis, 2005; Iversen & Iversen, 2007). In other instances, over production of dopamine produces negative consequences. For example, researchers have hypothesized that schizophrenia and some other severe mental disturbances are affected or perhaps even caused by the presence of unusually high levels of dopamine. Drugs that block the reception of dopamine reduce the symptoms displayed by some people diagnosed with schizophrenia (Baumeister & Francis, 2002; Bolonna & Kerwin, 2005; Olijslagers, Werkman, & McCreary, 2006). recapExplain the structure of a neuron.  ¦ A neuron has a cell body (which contains a nucleus) with a cluster of fibers called dendrites, which receive messages from other neurons. On the opposite end of the cell body is a tubelike extension, an axon, which ends in a small bulge called a terminal button. Terminal buttons send messages to other neurons. (p. 48) message to fire, it releases an action potential, an electrical charge that travels through the axon. Neurons operate according to an all-ornone law: Either they are at rest, or an action potential is moving through them. There is no in-between state. p. 49) Summarize how messages travel from one neuron to another.  ¦ Once a neuron fires, nerve impulses are carried to other neurons through the production of chemical substances, neurotransmitters, that actually bridge the gaps—known as synapses—between neurons. Neurotransmitters Describe how neurons fire.  ¦ Most axons are insulated by a coating called the myelin sheath. When a neuron receives a 54 Chapter 2 neuroscience and behavior may be either excitatory, telling other neurons to fire, or inhibitory, preventing or decreasing the likelihood of other neurons firing. (p. 52) I dentify neurotransmitters. Neurotransmitters are an important link between the nervous system and behavior. Common neurotransmitters include the following: acetylcholine, which transmits messages relating to our muscles and is involved in memory capabilities; glutamate, which plays a role in memory; gamma-amino butyric acid (GABA), which moderates behaviors from eating to aggression; dopamine, which is involved in movement, attention, and learning; serotonin, which is associated with the regulation of sleep, eating, mood, and pain; and endorphins, which seem to be involved in the brain’s effort to deal with pain and elevate mood. p. 53) evaluate 1. The is the fundamental element of the nervous system. and send messages through their 2. Neurons receive information through their . 3. Just as electrical wires have an outer coating, axons are insulated by a coating called the . 4. The gap between two neurons is bridged by a chemical connection called a 5. Endorphins are one kind of , the chemical â€Å"messengers† between neurons. . rethink How might psychologists use drugs that mimic the effects of neurotransmitters to treat psychological disorders? Answers to Evaluate Questions 1. neuron; 2. dendrites, axons; 3. yelin sheath; 4. synapse; 5. neurotransmitter key terms Behavioral neuroscientists (or biopsychologists) p. 47 Neurons p. 48 Dendrites p. 48 Axon p. 48 Terminal buttons p. 49 Myelin sheath p. 49 All-or-none law p. 49 Resting state p. 49 Module 5 neurons: the basic elements of behavior Action potential p. 50 Mirror neurons p. 50 Synapse p. 51 Neurotransmitters p. 52 Excitatory messages p. 52 Inhibitory messages p. 52 Reuptake p. 52 55 module 6 The Nervous System and the Endocrine System Communicating within the Body learning outcomes 6. 1 Explain how the structures f the nervous system are linked together. The complexity of the nervous system is astounding. Estimates of the number of connections between neurons within the brain fall in the n eighborhood of 10 quadrillion—a 1 followed by 16 zeros. Furthermore, connections among neurons are not the only means of communication within the body; as we’ll see, the endocrine system, which secretes chemical messages that circulate through the blood, also communicates messages that influence behavior and many aspects of biological functioning (Kandel, Schwartz, & Jessell, 2000; Forlenza & Baum, 2004; Boahen, 2005). . 2 Describe the operation of the endocrine system and how it affects behavior. Central nervous system (CNS) The part of the nervous system that includes the brain and spinal cord. Spinal cord A bundle of neurons LO 1 The Nervous System that leaves the brain and runs down the length of the back and is the main means of transmitting messages between the brain and the body. The human nervous system has both logic and elegance. We turn now to a discussion of its basic structures. Central and Peripheral Nervous SystemsAs you can see from the schematic repres entation in Figure 1, the nervous system is divided into two main parts: the central nervous system and the peripheral nervous system. The central nervous system (CNS) is composed of the brain and spinal cord. The spinal cord, which is about the thickness of a pencil, contains a bundle of neurons that leaves the brain and runs down the length of the back (see Figure 2). As you can see in Figure 1, the spinal cord is the primary means for transmitting messages between the brain and the rest of the body. 56 Chapter 2 euroscience and behavior The Nervous System Consists of the brain and the neurons extending throughout the body Peripheral Nervous System Made up of long axons and dendrites, it contains all parts of the nervous system other than the brain and spinal cord Central Nervous System Consists of the brain and spinal cord Somatic Division (voluntary) Specializes in the control of voluntary movements and the communication of information to and from the sense organs Autonomic Divi sion (involuntary) Concerned with the parts of the body that function involuntarily without our awarenessBrain An organ roughly half the size of a loaf of bread that constantly controls behavior Spinal Cord A bundle of nerves that leaves the brain and runs down the length of the back; transmits messages between the brain and the body Sympathetic Division Acts to prepare the body in stressful emergency situations, engaging resources to respond to a threat Parasympathetic Division Acts to calm the body after an emergency situation has engaged the sympathetic division; provides a means for the body to maintain storage of energy sources Figure 1 A schematic diagram of the relationship of the parts of the nervous system.However, the spinal cord is not just a communication channel. It also Reflex An automatic, involuntary controls some simple behaviors on its own, without any help from the response to an incoming stimulus. brain. An example is the way the knee jerks forward when it is tap ped with a rubber hammer. This behavior is a type of reflex, an automatic, involuntary response to an incoming stimulus. A reflex is also at work when psych 2. 0 you touch a hot stove and immediately withdraw your hand. Although the www. mhhe. com/psychlife brain eventually analyzes and reacts to the situation (â€Å"Ouch—hot stove— pull away! ), the initial withdrawal is directed only by neurons in the spinal cord. Three kinds of neurons are involved in reflexes. Sensory (afferent) neurons transmit information from the perimeter of the body to the central nervous system. Motor (efferent) neurons communicate information from the nervous system to muscles and glands. Interneurons connect sensory and motor neurons, carrying messages between the two. Organization of the Nervous System Module 6 the nervous system and the endocrine system 57 Central Nervous System Brain Spinal cord Peripheral Nervous System Spinal nervesFigure 2 The central nervous system, consisting of th e brain and spinal cord, and the peripheral nervous system. Sensory (afferent) neurons Neurons that transmit information from the perimeter of the body to the central nervous system. Motor (efferent) neurons Neurons that communicate information from the nervous system to muscles and glands. Interneurons Neurons that connect sensory and motor neurons, carrying messages between the two. Peripheral nervous system The part As suggested by its name, the peripheral nervous system branches out from the spinal cord and brain and reaches the extremities of the body.Made up of neurons with long axons and dendrites, the peripheral nervous system encompasses all the parts of the nervous system other than the brain and spinal cord. There are two major divisions— the somatic division and the autonomic division— both of which connect the central nervous system with the sense organs, muscles, glands, and other organs. The somatic division specializes in the control of voluntary moveme nts—such as the motion of the eyes to read this sentence or those of the hand to turn this page—and the communication of information to and from the sense organs.On the other hand, the autonomic division controls the parts of the body that keep us alive—the heart, blood vessels, glands, lungs, and other organs that function involuntarily without our awareness. As you are reading at this moment, the autonomic division of the peripheral nervous system is pumping blood through your body, pushing your lungs in and out, and overseeing the digestion of your last meal. Activating the Divisions of the Autonomic Nervous System The autonomic division plays a particularly crucial role during emergencies. Suppose that as you are reading in bed you suddenly sense that someone is outside your bedroom window.As you look up, you see the glint of an object that might be a knife. As confusion and fear overcome you, what happens to your body? If you are like most people, you react immediately on a physiological level. Your heart rate increases, you begin to sweat, and you develop goose bumps all over your body. The physiological changes that occur during a crisis result from the activation of one of the two parts of the autonomic nervous system: the sympathetic division. The sympathetic division acts to prepare the body for action in stressful situations by engaging all of the organism’s resources to run away or confront the threat.This response is often called the â€Å"fight-orflight† response. In contrast, the parasympathetic division acts to calm the body after the emergency has ended. When you find, for instance, that the stranger at the window is actually your boyfriend who has lost his keys and is climbing in the window to avoid waking you, your parasympathetic division begins to predominate, lowering your heart rate, stopping your sweating, and returning your body to the state it was in before you became alarmed. The parasympathetic div ision also directs the body to store energy for use in emergencies.The sympathetic and parasympathetic divisions work together to regulate many functions of the body (see Figure 3). of the nervous system that includes the autonomic and somatic subdivisions; made up of neurons with long axons and dendrites, it branches out from the spinal cord and brain and reaches the extremities of the body. Somatic division The part of the peripheral nervous system that specializes in the control of voluntary movements and the communication of information to and from the sense organs.Autonomic division The part of the peripheral nervous system that controls involuntary movement of the heart, glands, lungs, and other organs. 58 Chapter 2 neuroscience and behavior Parasympathetic Sympathetic Eyes Contracts pupil Dilates pupil (enhanced vision) Heart Slow heartbeat Accelerates, strengthens heartbeat (increased oxygen) Lungs Constricts bronchi Relaxes bronchi (increased air to lungs) Stomach, Intestin es Stimulates activity Inhibits activity (blood to muscles) Blood Vessels of Internal Organs Dilates vesselsContracts vessels (increases blood pressure) Figure 3 The major functions of the autonomic nervous system. The sympathetic division acts to prepare certain organs of the body for stressful situations, and the parasympathetic division acts to calm the body after the emergency has passed. Can you explain why each response of the sympathetic division might be useful in an emergency? (Source: Adapted from Passer & Smith, 2001. ) Behavioral Genetics Our personality and behavioral habits are affected in part by our genetic and evolutionary heritage.Behavioral genetics studies the effects of heredity on behavior. Behavioral genetics researchers are finding increasing evidence that cognitive abilities, personality traits, sexual orientation, and psychological disorders are determined to some extent by genetic factors (Reif & Lesch, 2003; Viding et al. , 2005; Ilies, Arvey, & Bouchard, 2006). Behavioral genetics lies at the heart of the nature-nurture question, one of the key issues in the study of psychology. Although no one would argue that our behavior is determined solely by inherited factors, evidenceSympathetic division The part of the autonomic division of the nervous system that acts to prepare the body for action in stressful situations, engaging all the organism’s resources to respond to a threat. Parasympathetic division The part of the autonomic division of the nervous system that acts to calm the body after an emergency or a stressful situation has ended. Behavioral genetics The study of the effects of heredity on behavior. Module 6 the nervous system and the endocrine system 59 ollected by behavioral geneticists does suggest that our genetic inheritance predisposes us to respond in particular ways to our environment, and even to seek out particular kinds of environments. For instance, research indicates that genetic factors may be related to such diverse behaviors as level of family conflict, schizophrenia, learning disabilities, and general sociability (Harlaar et al. , 2005; Moffitt & Caspi, 2007). Furthermore, important human characteristics and behaviors are related to the presence (or absence) of particular genes, the inherited material that controls the transmission of traits.For example, researchers have found evidence that novelty-seeking behavior is determined, at least in part, by a certain gene. As we will consider later in the book when we discuss human development, researchers have identified some 25,000 individual genes, each of which appears in a specific sequence on a particular chromosome, a rod-shaped structure that transmits genetic informaGenetic testing can be done to determine potential risks to an unborn child based on family history of tion across generations. In 2003, after a decade of effort, illnesses. esearchers identified the sequence of the 3 billion chemical pairs that make up human DNA, t he basic component of genes. Understanding the basic structure of the human genome—the â€Å"map† of humans’ total genetic makeup—brings scientists a giant step closer to understanding the contributions of individual genes to specific human structures and functioning (Plomin et al. , 2003; Plomin & McGuffin, 2003; Andreasen, 2005). Our personality and behavioral habits are affected in part by our genetic and evolutionary heritage. s tudy aler t The endocrine system produces hormones, chemicals that circulate through the blood via the bloodstream.Behavioral Genetics, Gene Therapy, and Genetic Counseling. Behavioral genetics also holds the promise of developing new diagnostic and treatment techniques for genetic deficiencies that can lead to physical and psychological difficulties. In gene therapy, scientists inject genes meant to cure a particular disease into a patient’s bloodstream. When the genes arrive at the site of defective genes that are pro ducing the illness, they trigger the production of chemicals that can treat the disease (Rattazzi, LaFuci, & Brown, 2004; Jaffe, Prasad, & Larcher, 2006; Plomin et al. 2008). The number of diseases that can be treated through gene therapy is growing, as we will see when we discuss human development. For example, gene therapy is now being used in experimental trials involving people with certain forms of cancer, leukemia, and blindness (Nakamura et al. , 2004; Wagner et al. , 2004; Hirschler, 2007). From the perspective of . . . A Physician’s Assistant How valuable would an understanding of the brain and neurosystem be in your job as a physician’s assistant? 60 Chapter 2 neuroscience and behaviorAdvances in behavioral genetics also have led to the development of a profession that did not exist several decades ago: genetic counseling. Genetic counselors help people deal with issues related to inherited disorders. For example, genetic counselors provide advice to prospect ive parents about the potential risks in a future pregnancy, based on their family history of birth defects and hereditary illnesses. In addition, the counselor will consider the parents’ age and problems with children they already have.They also can take blood, skin, and urine samples to examine specific chromosomes. Endocrine system A chemical communication network that sends messages throughout the body via the bloodstream. Hormones Chemicals that circulate through the blood and regulate the functioning or growth of the body. Pituitary gland The major component of the endocrine system, or â€Å"master gland,† which secretes hormones that control growth and other parts of the endocrine system. LO 2 The Endocrine System: Of Chemicals and Glands psych 2. www. mhhe. com/psychlife Another of the body’s communication systems, the endocrine system is a chemical communication network that sends messages throughout the body via the bloodstream. Its job is to secrete h ormones, chemicals that circulate through the blood and regulate the functioning or growth of the body. It also influences—and is influenced by—the functioning of the nervous system. As chemical messengers, hormones are like neurotransmitters, although their speed and mode of transmission are quite different.Whereas neural messages are measured in thousandths of a second, hormonal communications may take minutes to reach their destination. Furthermore, neural messages move through neurons in specific lines (like a signal carried by wires strung along telephone poles), whereas hormones travel throughout the body, similar to the way radio waves are transmitted across the entire landscape. Just as radio waves evoke a response only when a radio is tuned to the correct station, hormones flowing through the bloodstream activate only those cells which are receptive and â€Å"tuned† to the appropriate hormonal message.A key component of the endocrine system is the tiny pituitary gland. The pituitary gland has sometimes been called the â€Å"master gland† because it controls the functioning of the rest of the endocrine system. But the pituitary gland is more than just the taskmaster of other glands; it has important functions in its own right. For instance, hormones secreted by the pituitary gland control growth. Extremely short people and unusually tall ones usually have pituitary gland abnormalities. Other endocrine glands, shown in Figure 4, affect emotional reactions, sexual urges, and energy levels.Although hormones are produced naturally by the endocrine system, there are a variety of artificial hormones that people may choose to take. For example, physicians sometimes prescribe hormone replacement therapy (HRT) to treat symptoms of menopause in older women. Other artificial hormones can be harmful. For example, some athletes use testosterone, a male hormone, and drugs known as steroids, which act like testosterone. For athletes and ot hers who want to bulk up their appearance, steroids provide a way to add muscle weight and increase strength.However, these drugs can lead to heart attacks, strokes, cancer, and even violent behavior, making them extremely dangerous (Kolata, 2002; Arangure, 2005; Klotz, Garle, & Granath, 2006; Pagonis, Angelopoulos, & Koukoulis, 2006). The Endocrine System Steroids can provide added muscle strength, but they have dangerous side effects. A number of well-known athletes have been accused of using the drugs illegally. Jose Conseco is one of the few major league baseball players to admit steroid use. Module 6 the nervous system and the endocrine system 61 Anterior Pituitary Gland Produces 6 hormones with diverse actionsHypothalamus Secretes several hormones that stimulate or inhibit anterior pituitary function Posterior Pituitary Gland Secretes oxytocin, which stimulates uterine contractions during birth; also secretes antidiuretic hormone, which increases water retention in the kidney Pineal Makes melatonin, which regulates daily rhythms Parathyroids (behind the thyroid) Make parathyroid hormone, which increases blood calcium Thyroid Regulates metabolic rate and growth Stomach and Small Intestine Secrete hormones that facilitate digestion and regulate pancreatic activityHeart Makes atrial natriuretic peptide, which lowers blood sodium Adrenal Glands Medulla Makes epinephrine and norepinephrine, which mediate the â€Å"fight-or-flight† response Cortex Makes aldosterone, which regulates sodium and potassium balance in the blood; also makes glucocorticoids (such as cortisol), which regulate growth, metabolism, development, immune function, and the body’s response to stress Liver and Kidneys Secrete erythropoietin, which regulates production of red blood cells Pancreas Makes insulin Ovaries Produce estrogens such as progesterone, which control reproduction in femalesAdipose Tissue Produces adipokines (for example, leptin), which regulate appetite and me tabolic rate Testes Produce androgens, such as testosterone, which control reproduction in males Figure 4 Location and function of the major endocrine glands. The pituitary gland controls the functioning of the other endocrine glands and in turn is regulated by the brain. Steroids can provide added muscle and strength, but they have dangerous side effects. (Source: Adapted from Brooker et al, 2008, p. 1062) recap Explain how the structures of the nervous system are linked together. The nervous system is made up of the central nervous system (the brain and spinal cord) and the peripheral nervous system. The peripheral 62 Chapter 2 neuroscience and behavior nervous system is made up of the somatic division, which controls voluntary movements and the communication of information to and from the sense organs, and the autonomic division, which controls involuntary functions such as those of the heart, blood vessels, and lungs. (p. 56)  ¦ The autonomic division of the peripheral nervous system is further subdivided into the sympathetic and parasympathetic divisions.The sympathetic division prepares the body in emergency situations, and the parasympathetic division helps the body return to its typical resting state. (p. 58)  ¦ Behavioral genetics examines the hereditary basis of human personality traits and behavior. (p. 59) Describe the operation of the endocrine system and how it affects behavior.  ¦ The endocrine system secretes hormones, chemicals that regulate the functioning of the body, via the bloodstream. The pituitary gland secretes growth hormones and influences the release of hormones by other endocrine glands, and in turn is regulated by the hypothalamus. (p. 61) valuate 1. If you put your hand on a red-hot piece of metal, the immediate response of pulling it away would be . an example of a(n) 2. The central nervous system is composed of the and . 3. In the peripheral nervous system, the division controls voluntary movements, whereas the division c ontrols organs that keep us alive and function without our awareness. 4. Maria saw a young boy run into the street and get hit by a car. When she got to the fallen child, she was in a state of panic. She was sweating, and her heart was racing. Her biological state resulted from the activation of what division of the nervous system? . Parasympathetic b. Central c. Sympathetic rethink In what ways is the â€Å"fight-or-flight† response helpful to humans in emergency situations? Answers to Evaluate Questions 1. reflex; 2. brain, spinal cord; 3. somatic, autonomic; 4. sympathetic key terms Central nervous system (CNS) p. 56 Spinal cord p. 56 Reflex p. 57 Sensory (afferent) neurons p. 57 Motor (efferent) neurons p. 57 Interneurons p. 57 Peripheral nervous system p. 58 Somatic division p. 58 Module 6 the nervous system and the endocrine system 63 Autonomic division p. 58 Sympathetic division p. 58 Parasympathetic division p. 58 Behavioral genetics p. 9 Endocrine system p. 61 Hormon es p. 61 Pituitary gland p. 61 module 7 The Brain learning outcomes 7. 1 Illustrate how researchers identify the major parts and functions of the brain. 7. 2 Describe the central core of the brain. 7. 3 Describe the limbic system of the brain. 7. 4 Describe the cerebral cortex of the brain. 7. 5 Recognize neuroplasticity and its implications. 7. 6 Explain how the two hemispheres of the brain operate interdependently and the implications for human behavior. It is not much to look at. Soft, spongy, mottled, and pinkish-gray in color, it hardly can be said to possess much in the way of physical beauty.Despite its physical appearance, however, it ranks as the greatest natural marvel that we know and has a beauty and sophistication all its own. The object to which this description applies: the brain. The brain is responsible for our loftiest thoughts—and our most primitive urges. It is the overseer of the intricate workings of the human body. Many billions of neurons make up a str ucture weighing just three pounds in the average adult. However, it is not the number of cells that is the most astounding thing about the brain but its ability to allow the human intellect to flourish by guiding our behavior and thoughts.We turn now to a consideration of the particular structures of the brain and the primary functions to which they are related. However, a caution is in order. Although we’ll discuss specific areas of the brain in relation to specific behaviors, this approach is an oversimplification. No simple one-to-one correspondence exists between a distinct part of the brain and a particular behavior. Instead, behavior is produced by complex interconnections among sets of neurons in many areas of the brain: our behavior, emotions, thoughts, hopes, and dreams are produced by a variety of neurons throughout the nervous system working in concert.LO 1 Studying the Brain’s Structure and Functions: Spying on the Brain Modern brain-scanning techniques pro vide a window into the living brain. Using these techniques, investigators can take a â€Å"snapshot† of the interRemember that EEG, fMRI, nal workings of the brain without having to cut open a person’s skull. The PET, and TMS differ in terms most important scanning techniques, illustrated in Figure 1, are the elecof whether they examine troencephalogram (EEG), positron emission tomography (PET), functional brain structures or brain magnetic resonance imaging (fMRI), and transcranial magnetic stimulation functioning. maging (TMS). The electroencephalogram (EEG) records electrical activity in the brain through electrodes placed on the outside of the skull. Although traditionally the EEG could produce only a graph of electrical wave patterns, new techniques are now used to transform the brain’s electrical activity into a pictorial representation of the brain that allows more precise diagnosis of disorders such as epilepsy and learning disabilities. s tudy aler t 6 4 Chapter 2 neuroscience and behavior A EEG B fMRI scan C TMS apparatus D PET scan Figure 1 Brain scans produced by different techniques. A) A computerproduced EEG image. (B) The fMRI scan uses a magnetic field to provide a detailed view of brain activity on a moment-by-moment basis. (C) Transcranial magnetic stimulation (TMS), the newest type of scan, produces a momentary disruption in an area of the brain, allowing researchers to see what activities are controlled by that area. TMS also has the potential to treat some psychological disorders. (D) The PET scan displays the functioning of the brain at a given moment. Positron emission tomography (PET) scans show biochemical activity within the brain at a given moment.PET scans begin with the injection of a radioactive (but safe) liquid into the bloodstream, which makes its way to the brain. By locating radiation within the brain, a computer can determine which are the more active regions, providing a striking picture of the brain at work. Functional magnetic resonance imaging (fMRI) scans provide a detailed, three-dimensional computer-generated image of brain structures and activity by aiming a powerful magnetic field at the body. With fMRI scanning, it is possible to produce vivid, detailed images of the functioning of the brain.Transcranial magnetic stimulation (TMS) is one of the newest types of scan. By exposing a tiny region of the brain to a strong magnetic field, TMS causes a momentary interruption of electrical activity. Researchers then are able to note the effects of this interruption on normal brain functioning. The procedure is sometimes called a â€Å"virtual lesion† because it produces effects analogous to what would occur if areas The brain (shown here in cross section) may not be much to of the brain were physically cut. The enormous look at, but it represents one of the great marvels of human advantage of TMS, of course, is that the virtual development.Why do most scientist believe that it will be difficult, if not impossible, to duplicate the brain’s abilities? cut is only temporary. Module 7 the brain 65 Cerebral cortex (the â€Å"new brain†) LO 2 The Central Core: Our â€Å"Old Brain† Although the capabilities of the human brain far exceed those of the brain of any other species, humans share some basic functions, such as breathing, eating, and sleeping, with more primitive animals. Not surprisingly, those activities are directed by a relatively primitive part of the brain.A portion of the brain known as the central core (see Figure 2) is quite similar in all vertebrates Central core (species with backbones). The central core is sometimes referred to as the â€Å"old (the â€Å"old brain†) brain† because its evolution can be traced back some 500 million years to primFigure 2 The major itive structures found in nonhuman species. divisions of the brain: the If we were to move up the spinal cord from the base of the skull to loca te cerebral cortex and the the structures of the central core of the brain, the first part we would come central core. Source: Seeley, to would be the hindbrain, which contains the medulla, pons, and cerebellum Stephens, & Tate, 2000. ) (see Figure 3). The medulla controls a number of critical body functions, the most important of which are breathing and heartbeat. The pons comes next, joining the two halves of the cerebellum, which lies adjacent to it. Containing large bundles of nerves, the pons acts as a transmitter of motor information, coordinating muscles and integrating movement between the right and left Central core The â€Å"old brain,† which halves of the body.It is also involved in regulating sleep. controls basic functions such as eating The cerebellum is found just above the medulla and behind the pons. and sleeping and is common to all Without the help of the cerebellum we would be unable to walk a straight vertebrates. line without staggering and lurching forw ard, for it is the job of the cerebelCerebellum (ser uh BELL um) The lum to control bodily balance. It constantly monitors feedback from the part of the brain that controls bodily muscles to coordinate their placement, movement, and tension. In fact, balance. rinking too much alcohol seems to depress the activity of the cerebellum, leading to the unsteady gait and movement characteristic of drunkenness. Hypothalamus Responsible for regulating basic biological needs: hunger, thirst, temperature control Cerebral Cortex Pituitary Gland â€Å"Master† gland that regulates other endocrine glands Corpus Callosum Bridge of fibers passing information between the two cerebral hemispheres Pons Involved in sleep and arousal Thalamus Relay center for cortex; handles incoming and outgoing signals Reticular Formation A network of neurons related to sleep, arousal, and attention Cerebellum Controls bodily balanceSpinal Cord Responsible for communication between brain and rest of body; involv ed with simple reflexes Medulla Responsible for regulating largely unconscious functions such as breathing and circulation Figure 3 66 The major structures in the brain. (Source: Johnson, 2000. ) Chapter 2 neuroscience and behavior The cerebellum is also involved in several intellectual functions, ranging from the analysis and Like an ever-vigilant guard, the coordination of sensory information to problem reticular formation is made up of solving (Bower & Parsons, 2004; Paquier & Marien, 2005; Vandervert, Schimpf, & Liu, 2007). roups of nerve cells that can activate The reticular formation extends from the other parts of the brain immediately medulla through the pons, passing through the middle section of the brain—or midbrain—and to produce general bodily arousal. into the front-most part of the brain, called the forebrain. Like an ever-vigilant guard, the reticular formation is made up of groups of nerve cells that can activate other parts of the brain immediately to produce general bodily arousal.If, for example, we Reticular formation The part of the brain extending from the medulla are startled by a loud noise, the reticular formation can prompt a heightened through the pons and made up state of awareness to determine whether a response is necessary. The reticuof groups of nerve cells that can lar formation serves a different function when we are sleeping, seeming to immediately activate other parts of the brain to produce general bodily filter out background stimuli to allow us to sleep undisturbed. arousal.Hidden within the forebrain, the thalamus acts primarily as a relay staThalamus The part of the brain tion for information about the senses. Messages from the eyes, ears, and skin located in the middle of the central travel to the thalamus to be communicated upward to higher parts of the core that acts primarily to relay brain. The thalamus also integrates information from higher parts of the information about the senses. brain, sorting it out so that it can be sent to the cerebellum and medulla. Hypothalamus A tiny part of the The hypothalamus is located just below the thalamus.Although tiny— brain, located below the thalamus, that about the size of a fingertip—the hypothalamus plays an extremely impor- maintains homeostasis and produces tant role. One of its major functions is to maintain homeostasis, a steady and regulates vital behavior, such as eating, drinking, and sexual behavior. internal environment for the body. The hypothalamus helps provide a conLimbic system The part of the brain stant body temperature and monitors the amount of nutrients stored in the that controls eating, aggression, and cells.A second major function is equally important: the hypothalamus produces and regulates behavior that is critical to the basic survival of the spe- reproduction. cies, such as eating, self-protection, and sex. LO 3 The Limbic System: Beyond the Central Core The limbic system of the brain consists of a series of doughnut-shaped structures that include the amygdala and hippocampus, the limbic system borders the top of the central core and has connections with the cerebral cortex (see Figure 4).The structures of the limbic system jointly control a variety of basic functions relating to emotions and self-preservation, such as eating, aggression, and reproduction. Injury to the limbic sysFrontal lobe tem can produce striking changes in behavior. For example, injury to the amygdala, which is involved in fear and aggression, can turn animals that are usually docile and tame into belligerent savages. Conversely, animals that are usually wild and uncontrollable may become meek and obedient following injury to the amygdala (Bedard & Persinger, 1995; Amygdala Gontkovsky, 2005).Hippocampus The limbic system is involved in Spinal cord several important functions, including Figure 4 The limbic system consists of a series of doughnut-shaped structures that are involved in selfpreservation, l earning, memory, and the experience of pleasure. 67 Module 7 the brain self-preservation, learning, memory, and the experience of pleasure. These functions are hardly unique to humans; in fact, the limbic system is sometimes referred to as the â€Å"animal brain† because its structures and functions are so similar to those of other mammals.To identify the part of the brain that provides the complex and subtle capabilities that are uniquely human, we need to turn to another structure—the cerebral cortex. LO 4 Cerebral cortex The â€Å"new brain,† responsible for the most sophisticated information processing in the brain; contains four lobes. The Cerebral Cortex: Our â€Å"New Brain† As we have proceeded up the spinal cord and into the brain, our discussion has centered on areas of the brain that control functions similar to those found in less sophisticated organisms.But where, you may be asking, are the Lobes The four major sections of portions of the bra in that enable humans to do what they do best and that the cerebral cortex: frontal, parietal, distinguish humans from all other animals? Those unique features of the temporal, and occipital. human brain—indeed, the very capabilities that allow you to come up with Motor area The part of the cortex that such a question in the first place—are embodied in the ability to think, evalis largely responsible for the body’s uate, and make complex judgments. The principal location of these abilities, voluntary movement. long with many others, is the cerebral cortex. The cerebral cortex is referred to as the â€Å"new brain† because of its relatively recent evolution. It But where, you may be asking, are consists of a mass of deeply folded, rippled, convoluted tissue. Although only about one-twelfth of the portions of the brain that enable an inch thick, it would, if flattened out, cover an area more than two feet square. This configurahumans to do what they do best and tion allows the surface area of the cortex to be that distinguish humans from all considerably greater than it would be if it were smoother and more uniformly packed into the other animals? kull. The uneven shape also permits a high level of integration of neurons, allowing sophisticated information processing. The cortex has four major sections called lobes. If we take a side view of the psych 2. 0 brain, the frontal lobes lie at the front center of the cortex and the parietal lobes www. mhhe. com/psychlife lie behind them. The temporal lobes are found in the lower center portion of the cortex, with the occipital lobes lying behind them. These four sets of lobes are physically separated by deep grooves called sulci. Figure 5 shows the four areas.Another way to describe the brain is in terms of the functions associated with a particular area. Figure 5 also shows the specialized regions within the lobes related to specific functions and areas of the body. Three major areas are k nown: the motor areas, the sensory areas, and the association areas. Although we will discuss these areas as though they were separate and independent, keep in mind that this is an oversimplification. In most instances, The Brain behavior is influenced simultaneously by several structures and areas within the brain, operating interdependently.The Motor Area of the Cortex If you look at the frontal lobe in Figure 5, you will see a shaded portion labeled motor area. This part of the cortex is largely responsible for the body’s voluntary movement. Every portion of the motor area corresponds to a specific locale within the body. If we were to insert an electrode into a particular part of the motor area of the cortex and apply mild electrical stimulation, there would be involuntary 68 Chapter 2 neuroscience and behavior Somatosensory area Somatosensory association area Motor area Frontal Lobe Broca’s areaParietal Lobe Primary auditory area Wernicke’s area Auditory as sociation area Temporal Lobe Visual area Visual association area Occipital Lobe Figure 5 The cerebral cortex of the brain. The major physical structures of the cerebral cortex are called lobes. This figure also illustrates the functions associated with particular areas of the cerebral cortex. Are any areas of the cerebral cor