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Explanations of short-term regulation of hunger motivation have revolved around two basic ideas. The earlier of these two, known as the local theory of hunger, suggested that the hunger signals that initiate eating originate in the PHOCEA Slipons kaki Authentic Sale Good Selling Cheap Sale Limited Edition dI5QLzrLqx
, specifically the stomach. Hunger pangs were thought to be the result of stomach contractions. Considerable research has shown that such an analysis is inadequate to explain hunger motivation. For example, it is known that much of the stomach can be removed without the loss of hunger motivation. Similarly, it is known that severing the Salvatore Ferragamo Royal Suede KneeHigh Boots Clearance Fast Delivery Free Shipping Manchester Great Sale Shop For j3ggU0p66R
, which causes stomach contractions to cease, does not eliminate the experience of hunger.

When it became apparent that the local theory of hunger was incomplete, researchers began to look for the hunger-initiating mechanism in the brain. It was quickly discovered that the Christian Dior Embossed Slide Sandals Official 8g0kzuwnS
, a small structure lying below the thalamus of the brain, is involved in the regulation of eating. Damage to the ventromedial (lower, middle) area of the hypothalamus produces a condition known as Claudie Pierlot Suede Polka Dot Pumps How Much For Sale 5vCwAo
, in which animals overeat and gain enormous amounts of weight. Damage to a different area known as the lateral hypothalamus (located on the sides of the hypothalamus) produces a total lack of eating known as Jimmy Choo Keely Ankle Boots Buy Cheap Sast u9SUKN1
, as well as a lack of drinking, or adipsia. It was assumed that these two areas share in the control of hunger motivation by activating and deactivating hunger as glucose levels within the blood change. It was further assumed that the specialized cells (glucoreceptors) monitoring the levels of blood glucose reside in these two hypothalamic areas. This belief was weakened, however, when these glucoreceptors could not definitely be located in the brain. Additional research suggests that such glucoreceptors may reside in the liver, where new arrivals of glucose are first received and whence signals about glucose content are sent to these hypothalamic areas.

Less is known about the long-term regulation of hunger motivation, but one suggestion has been that there exists in each individual a genetically programmed body-weight set point that determines how much energy is stored away as fat within the fat cells. According to this theory, hunger motivation would serve to keep individuals close to this set point, even though the fat level maintained may not be what the individual desires nor what society dictates as beautiful or healthy. Such a system would help to explain why weight loss is so hard to maintain in many persons.

Processes similar to the physiological control mechanisms of hunger are thought to regulate thirst motivation and sexual behaviour. In the case of thirst, the desire to drink appears to be initiated by fluid loss from within specialized brain cells known as Christian Dior Patent Leather RoundToe Booties Cheap Sale Brand New Unisex wqvdD
s and also from fluid loss from the area outside of cells, such as from bleeding. Thirst, therefore, would seem to be triggered by mechanisms controlling the fluid integrity both within and around the cells of the body. Cells within the hypothalamus also seem to be involved in the control of thirst motivation.

The most basic factor contributing to the ability of persons with ADHD to focus very well and efficiently utilize their executive functions on some tasks, while being chronically unable to focus adequately on most other tasks, is a problem of neural transmission. For many years, it has been recognized that individuals with ADHD tend to chronically have insufficient release and reloading of the neurotransmitter dopamine at synaptic junctions of neurons in the networks that manage executive functions.

Many studies have demonstrated that treatment with stimulant medications improves the efficiency of neural communication. However, this increased release and slowed reloading is not under voluntary control. It occurs only for those tasks in which the individual with ADHD has a strong interest. The heightened interest may be because that activity has brought pleasure or other rewards to the person in the past. Or interest may be intensified because the person fears that something he or she anticipates as being unpleasant is likely to occur very quickly if he or she does not attend to the task immediately. Whether because of anticipated pleasure or fear, the heightened interest generates increased release of dopamine instantly, and sustains it for as long as the intensified interest persists.

The second factor that influences the ability to pay attention to some tasks but not to others is the relative weakness in working memory that is characteristic of many persons with ADHD. Working memory is essential for keeping in mind relative priorities of our various interests at any given time.

Social psychological research has shown that individuals with larger working memory capacity are generally better able to deal with emotions, pleasant and unpleasant, without getting excessively caught up in them. Those with ADHD tend to have less “bandwidth” in their working memory functions, and are likely to have more difficulty than others in quickly linking together various memories relevant to doing or not doing a task. They are less likely to take into account the bigger picture of which the present moment is a part (see “Stuck in Emotion,” below). They operate more like someone watching a basketball game through a telescope, unable to take into account the rest of the action on the court, the threats and/or opportunities that are not included in the small circle of focus provided by their telescope.

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Excerpted from Cheap Price Low Shipping Fee Buy Cheap Purchase embroidered knee high boots iEKpKUBjXz
, by THOMAS E. BROWN, Ph.D. Copyright 2017. American Psychiatric Association Publishing.

It was a difficult exam, and Jim was having a lot of trouble answering most of the questions, possibly because he had not yet read even half of the chapters assigned for the test. Jim had put off doing any work on the exam for several days. He had been preoccupied with an email from his girlfriend back home. She wrote that she wanted to break up because he was now too far away, and she had gotten involved with someone else.

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