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The dopamine hypothesis of schizophrenia or the dopamine hypothesis of psychosis is a model that attributes the positive symptoms of schizophrenia to a disturbed and hyperactive dopaminergic signal transduction. The model draws evidence from the observation that a large number of antipsychotics have dopamine-receptor antagonistic effects. The ...
For years scientists have known that irregular levels of dopamine have some connection to psychosis and are a critical factor in schizophrenia, Alzheimer’s disease and other neuropsychiatric ...
The causes of schizophrenia that underlie the development of schizophrenia, a psychiatric disorder, are complex and not clearly understood.A number of hypotheses including the dopamine hypothesis, and the glutamate hypothesis have been put forward in an attempt to explain the link between altered brain function and the symptoms and development of schizophrenia.
There is evidence that schizophrenia involves altered levels of dopamine activity, and most antipsychotic drugs used to treat this are dopamine antagonists which reduce dopamine activity. [10] Similar dopamine antagonist drugs are also some of the most effective anti-nausea agents.
It is thought that the psychotic symptoms within schizophrenia are primarily due to overactive dopamine activity in the mesolimbic area of the brain. [4] Therefore, dopamine supersensitivity may reduce the effect of antipsychotics and increase the brain's response to endogenous dopamine, leading to worsening psychosis. [4]
The common dopamine and glutamate models proposed are not mutually exclusive; each is seen to have a role in the neurobiology of schizophrenia. [128] The most common model put forward was the dopamine hypothesis of schizophrenia, which attributes psychosis to the mind's faulty interpretation of the misfiring of dopaminergic neurons. [129]
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