One Or More Biological Explanation

Outline and Evaluate one or more biological explanation of Schizophrenia (25 marks) The biological approach assumes that Schizophrenia is caused by genetic predisposition and/or chemical imbalances. The dopamine gibe suggests that dopamine over- exertion causes Schizophrenia. Wise & Stein (1973) proposed that a omit of the enzyme that converts dopamine to noradrenaline causes Schizophrenia. This results in too much dopamine and non enough noradrenaline. This is a believable theory because norepinephrine is jazz in the brains reward system; so low levels of norepinephrine in the reward centre of the hypothalamus whitethorn lead to a malfunctioning of the reinforcement system, which could peak for symptoms of Anhedonia. Anhedonia is the inability to feel delight from activities or events that normally cause pleasure. More evidence in support of this model comes from findings that catecholamine, such as dopamine and norepinephrine, nicety up certain cognitive function s. For example, Foote et al., (1975) found that application of norepinephrine to the cells in the auditory cortex of squirrel monkeys increased the rate of fire of excitant specific cells (neurons that are firing in reply to a real sound) relative to compass cell activity.

This could fib for the auditory hallucinations experienced by those with Schizophrenia as they may be failing to discriminate between external stimuli and the background activity of their brain. A problem with this theory is that it does not explain wherefore symptoms improve only gradually when a forbearing is victorious appropriate me dication, although these drugs have an immed! iate effect on dopamine levels in the brain. Therefore this brook immoral that dopamine is not the ONLYY cause and as a result this can mean that this theory is seen as reductionist. It can also be seen as simplistic as it does not take into account of the serotonin and noradrenalin. And lastly it is only a correlational mull over and so it only shows us...If you want to get a plenteous essay, prepare it on our website: BestEssayCheap.com

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