Biochemical explanations are down to the dysfunction of the neurotransmitters: dopamine, serotonin and glutamate.
The Dopamine Hypothesis
- Schizophrenia is caused by an excess of DA (dopamine) activity either in terms of too much of it being released or there being too many receptors (particularly D2).
- This causes the brain to function abnormally and become depentend on dopamine, thus causing schizophrenic symptoms. Depending on where the excess of dopamine is different symptoms are shown, when in the mesolimbic pathway results in positive symptoms such as hallucinations and the mesocortical system resulting in negative symptoms such as affective flattening.
- The excess may be a result of there being no/little enzymes to destroy spare neurotransmitters that don't find their receptors. Too much dopamine can result in transmitters can leap to other receptors in a different area causing mixed messages, meaning that the person can become confused and mixed up resulting in schizophrenic symptoms.
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