What is one of the key physiological abnormalities associated with schizophrenia?

Choice A reason: While serotonin dysregulation may play a role in mood disorders, decreased serotonin in the prefrontal cortex is not the primary abnormality in schizophrenia. Choice B reason: Schizophrenia is strongly associated with increased dopamine activity in mesolimbic brain regions, contributing to positive symptoms such as hallucinations and delusions. This is the key physiological abnormality. Choice C reason: Acetylcholine receptor activity is not a defining abnormality in schizophrenia. It is more relevant to cognitive disorders such as Alzheimer’s disease. Choice D reason: Excessive GABA production is not linked to schizophrenia. In fact, GABA dysfunction is more associated with anxiety disorders.