Iverson - found that post mortem studies of diagnosed 'SZ' showed higher than normal concentrations of dopamine in the limbic system. Falkai et al found the same but in the amygdala (associated with aggression, emotion and language comphrension).
Wong et al - he discovered that SZ sufferers (who had never taken drugs, this is important as you can rule out drug abuse effects on the brain) had a greater density of dopamine receptors in the 'Caudate nuclei' compared to the control group who had fewer. Caudate nuclei (associated with learning, memory and language comphrension).
Davis et al - In non 'SZ', cocaine and amphetamines produce delusions and hallucinations similar to those who have 'SZ'. Both drugs are known to stimulate dopamine receptors and both exacerbate 'SZ' symptoms. Davis et al - found that 'SZ' have 6 times more D4 receptors than non 'SZ'. D4 is a particular type of dopamine found in the brain.
Kimble - Drugs which treat 'SZ' reduce the concentration of brain dopamine by blocking dopamine receptors.
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