Biological Explanation of Schizophrenia Essay

893 WordsOct 14, 20144 Pages
Best Student Essay: Chloe Parkinson Score: 11/12 Feedback from Miss Earl: In order to ensure that you are always in the top mark band ensure that you always have thorough (i.e. detailed) discussion. You should work towards immediate evaluation of any A01 points rather than leaving it until the end of a section so that your A02 runs throughout. Outline and evaluate the biological explanation of schizophrenia (12 marks) The biological explanation of schizophrenia is also known as the ‘medical model’. This approach sees mental disorders as having physical causes. A number of biological explanations for schizophrenia have emerged including genetic, neurochemical and neuro-anatomical explanations. The genetic explanation of schizophrenia says that the disorder tends to run in families, studies have shown the closer the generic relatedness; the higher is the likelihood of schizophrenia. The risk of schizophrenia in the general population is 1%. Gottesman and Shields carried out early familial studies and gave % likelihood rates for various relatives. For example, if you have a parent with schizophrenia, the life-time risk of schizophrenia for you is 5.6%. Family studies have confirmed that the disorder does tend to run in families; however it is not clear whether this is due to genetics or environmental factors. Twin and adoption studies have been carried out to investigate this. As monozygotic twins have 100% of genes in common, it is suggested that the concordance rate for them is greater then dizygotic twins. Gottesman and Shields confirmed that the average concordance rate for monozygotic twins is 46% whereas is it only 14% in dizygotic twins. These averages were worked out from five studies that they conducted. Adoption studies can separate the environment from genes. An early adoption study by Heston in 1966 of 47 mothers with schizophrenia whose
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