Outline and evaluate the role of neural mechanisms in eating behaviour AO1: One way in which eating behaviour is controlled is by a process called homeostasis. This involves mechanisms which both detect the state of the internal environment and also correct the situation to restore that environment to its optimal state. The body has evolved two separate systems‚ one for turning eating on and another for turning it off. Glucose levels play an important role in producing feelings of hunger. When
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Outline and evaluate the role of neural mechanisms in controlling eating behaviour (24 marks) Today there is enormous interest in the psychological factors that can affects a person’s eating habits‚ but some of the clearest research findings have come from research into the brain (neural) mechanisms controlling eating behaviour. One important mechanism to consider is the role of homeostasis in all mammals. Homeostasis is how the body maintains a constant internal environment. Our diet is essential
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Outline and evaluate neural and hormonal mechanisms in aggression. There are two main biological explanations to aggression‚ neural and hormonal. The neural explanation is the serotonin and dopamine neurotransmitters and how they affect our aggression; the hormonal mechanisms are the testosterone and cortisol chemicals. Testosterone is a hormone that is more concentrated in men than in women as it is a male sex hormone‚ it is thought to influence aggression from a young age onwards‚ due to its actions
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Discuss the role of neural mechanisms involved in controlling eating and satiation. 8+16 or 4+8 1. The body is regulated by homeostatic mechanisms; concerning food intake this is dependent on glucose levels. Decrease in glucose levels means hunger levels increase‚ whereas an increase in glucose levels means satiation is reached. 2. Research has revealed two significant eating centres in the hypothalamus; the lateral hypothalamus (LH) and the ventro-medial hypothalamus (VMH). Research from the 1940s
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Aggression in both animals and humans has been associated with low levels of serotonin and high levels of dopamine. Serotonin appears to stop aggression. So it is harder to stop aggression for those people with low levels of serotonin. David et al suggests that serotonin levels found in criminals are lower than in non-violent criminals. It has also been found that reducing serotonin levels in Vervet monkeys increases their aggressive behaviour‚ and increasing serotonin levels reduces aggressiveness
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DISCUSS THE ROLE OF NEURAL AND HORMONAL MECHANISMS IN HUMAN AGGRESSION Neurotransmitters are chemicals that enable impulses within the brain to be transmitted from one area of the brain to another. Serotonin is thought to reduce aggression by inhibiting responses to emotional stimuli that might otherwise lead to an aggressive response. Low serotonin in the brain has been associated with an increased susceptibility to impulsive behaviour‚ aggression and even violent suicide. A meta-analysis found
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Neural and Hormonal Mechanisms in Aggression Aggression in humans has been associated with low levels of serotonin and high levels of dopamine. Usually‚ serotonin has a calming effect‚ which inhibits aggression. When serotonin levels are low‚ this inhibitory effect is removed and people are less able to control their aggressive behaviour. Evidence for the importance of serotonin comes from two main sources. Brown (1982) found that there were low levels of the waste products of serotonin in the
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“Outline and evaluate fators that affect eating behaviours.” There is huge debate as to which factors affect the eating behaviours of an individual. A key issue is whether our food choices are down to innate behaviours and our genetics or whether they are an outcome of the environment in which we are brought up in‚ such as our cultures and socio-economic circumstances. One key factor which affects our food choices is our mood. It is generally accepted that food can be comforting when we feel upset
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It has been shown that impulsive behavior and aggression have been associated with having low levels of serotonin. Evidence for the role of serotonin comes from the use of drugs that raise levels of serotonin in the brain‚ such as antidepressants. In clinical studies‚ antidepressant drugs which increase serotonin levels also tend to reduce irritability and impulsive aggression. This suggests that increased serotonin levels do lead to reduced aggression. Mann et all gave 35 healthy subjects dexfenfluramine
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Outline and Evaluate Psychological Explanations for one eating disorder The psychodynamic approach suggests unconscious conflicts from childhood may be the reason for an eating disorder. As adolescent girls are most likely to have the disorder‚ it suggests that anorexia might be due to fear of increasing sexual desires and starvation is a way to avoid becoming pregnant because one of the symptoms of anorexia nervosa is the absence of a menstrual cycle. Another psychodynamic explanation suggests anorexia
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