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Biological explanations of schizophrenia; Biological;
- Genetics ­ prevalence of schizophrenia is the same all over the world (about - Genetics ­ the fact the prevalence doesn't vary worldwide shows that it is
1%) not due to environment (nurture) ­ there is a strong genetic link. However,
- Brain biochemistry ­ dopamine hypothesis. Dopamine is a neurotransmitter there are variations within broad geographical areas (e.g. Torrey 2002 ­
operating in the brain. Schizophrenics are thought to have excessive Croatia and Ireland).…read more

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Brain biochemistry; dopamine production makes you more aware of your
environment. Too much dopamine could lead to hallucinations etc. it
connects parts of the brain together that shouldn't be connected. The
most likely explanation for the dopamine hypothesis is that receptor cites
are very sensitive leading to a larger impulse being felt. However, another
explanation believes that schizophrenics may in fact have more receptor
cites. This is supported by the many post-mortem studies that show people
with schizophrenia have more receptor cites.…read more

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Cause and effect issues everywhere. Confounding effects of
drug treatment.
Psychological; - Behavioural; believe that schizophrenia runs in families as bizarre behaviour
- Behavioural ­ mental disorders regarded as sets of learned behaviours. The by parents is imitated by children. Parents then reinforce this and the
behaviour is acquired though observation of others (social learning theory) behaviour becomes progressively more unusual, until eventually the child
the behaviour is then maintained though operant processes. acquires the label of being `schizophrenic'.…read more


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