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THE BIOLOGICAL APPROACH TO PSYCHOPATHOLOGY

Approaches to psychopathology are based on different views of the CAUSE of abnormality. The models have different views about how abnormality comes about in the first place

Assumptions of the biological model • Abnormality is caused by physical factors – as all behaviour is associated with changes in brain function, abnormal behaviour will be caused by changes in either the structure or function of the brain. - For example in terms of the structure of the brain (neuroanatomy) a damaged hypothalamus has been linked to anorexia - In terms of the function of the brain, neurotransmitters and hormones have been linked to psychopathology, e.g. low levels of serotonin have been lined to depression.

• Abnormality is inherited – the genetic view is that there are abnormal genes that are inherited, i.e. passed down from parents to children, even though they may not be shown in every generation. Family, twin and adoption studies are used to establish concordance rates (this shows the extent to which members of the same family share a particular characteristic) to test for genetic predispositions as an explanation of abnormality. - For example Holland et al (1988) found a 56% concordance rate for identical twins (MZ) and only a 5% concordance rate for non-identical twins (DZ) in anorexia nervosa which supports the idea of a genetic basis for abnormality.

Evaluation of the biological model

Strengths 1. Physiological evidence – A strength of the biological model is that the use of brain scans and other modern techniques has identified and provided support for the biological aspects of many psychological disorders. Depression for example, seems to be associated with lowered levels of brain serotonin, while schizophrenia has been linked to over-activity of the neurotransmitter dopamine,

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