Search results
Results From The WOW.Com Content Network
Dopamine supersensitivity may be caused by the dopamine receptor D 2 antagonizing effect of antipsychotics, causing a compensatory increase in D 2 receptors within the brain that sensitizes neurons to endogenous release of the neurotransmitter dopamine. Because psychosis is thought to be mediated—at least in part—by the activity of dopamine ...
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 symptoms of dissociative intoxication are also considered to mirror the symptoms of schizophrenia, including negative symptoms. [98] NMDA receptor antagonism, in addition to producing symptoms reminiscent of psychosis, mimics the neurophysiological aspects, such as reduction in the amplitude of P50, P300, and MMN evoked potentials. [99]
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.
The dopamine hypothesis drew additional support from the observation that psychotic symptoms were often intensified by dopamine-enhancing stimulants such as methamphetamine, and that these drugs could also produce psychosis in healthy people if taken in large enough doses. [120]
Elevated dopamine levels in the neural circuit concerned with neuropsychiatric disorders are postulated to be responsible for the manic and psychosis symptoms and other signs, including fluctuations in body temperatures and fear. [17]
Dopamine can increase or decrease the activity of the area of the brain it acts on depending on where in the brain it is. Dopamine is lower than normal in people with catatonia, which is thought to cause many of the motor symptoms, because dopamine is the main neurotransmitter which activates the parts of the brain responsible for movement.