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Discuss two or more biological explanations of schizophrenia (24 marks)

The biological approach assumes that schizophrenia has an organic cause, though this does not ignore
any psychological factors that may play a part in the onset of the disorder. There may be a
`diathesis-stress' relationship whereby a biological predisposition develops…

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The second explanation is the dopamine hypothesis which suggests that schizophrenia develops due
to the sensitivity and density of dopamine receptors. Weinberger (1987) claimed that schizophrenia
is due to the over activity and underactivity of the pathways in the midbrain linking to the limbic
system.

Supporting evidence for the dopamine…

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