individual differences: the biological approach

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Biological approach for explaining mental illness
All mental disorders are caused by a biological change in the body e.g:
These causes may be linked. Abnormal genes may lead to abnormal neural
development (schizophrenia and ventricles) or abnormal levels of
neurotransmitters (too little serotonin causes depression)
Exposure to viruses when in the womb can lead to schizophrenia. The virus
may lay dormant in a person until puberty
Neurotransmitters are the chemical released at the synapse (gap between 2
neurons) that transports electrical signals from one neuron to another
across the synapse. Depression can be caused by a lack of serotonin (a
neurotransmitter) so positive signals travelling towards the synapse cannot
cross the synapse and reach the conscious part of the brain. Schizophrenia
can be caused by having too much Dopamine meaning electrical signals can't
reach the synapse. The increase in Dopamine causes false signals to be
created leading to hallucinations
The Neuroanatomy of the brain can cause mental illness such as
schizophrenia. Spaces in the brain are called ventricles. If the ventricles
are bigger the brain has less brain cells, meaning the person may not be
able to do as much as other people can. It could therefore lead to negative
symptoms of schizophrenia such as Avolition, Algoia and affective thinking.


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