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Biological theory
· Assumes there's relationship between behaviour and
body's psychological behaviour
· Low levels of Serotonin ­ Depression
· Too much Dopamine- Schizophrenia…read more

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Assumes that all behaviour is associated with changes in the
brain function. Mental illnesses may be caused by changes in
the structure or function of the brain + that the
development of body (brain) heavily influenced by genetics
· Might involve changes in:
-size of brain
-activity of brain neurotransmitters and hormones
-Chemicals that carry a signal
Hormones- Blood stream…read more

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Strengths and weakness of Biological theory
*Brain scanning supports- has identified biological parts of many
psychopathologies eg: depression associated with low levels of
serotonin & Schizophrenia associated with over activity of
*Brain scanning also found- patients suffering from
schizophrenia appeared to have loss of tissue in some parts of
their brain.
*Drug treatments based on biological theory targets biological
bases of the disorder- can be very effective for depression,
schizophrenia or anxiety.…read more

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Strengths and weakness of Biological theory
*this approach is reductionist- assumes that most important part
of behavioural disorders are the biological changes in the brain
DOESN'T look at other factors: behaviour, symptoms and
environmental influences. Eg: Depression linked to low levels of
serotonin however environmental factors have a large impact
*Even though drug treatments provide support for biological
approach not always effective for everyone or particular
conditions like phobias or eating disorders- drugs are largely
ineffective here.…read more

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Anti-psychotic drugs
Conventional antipsychotics- Used mainly to combat
positive symptoms of schizophrenia: delusions &
hallucinations. They block action of Dopamine in the
brain- bind to dopamine receptors.
A-typical antipsychotic drugs ­ Act by only temporarily
occupying dopamine receptors and quickly leaving
them to allow normal dopamine transmission. They
have less side effects than conventional antipsychotics.…read more

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