Final answer:
Physiological theories of schizophrenia have focused on the role of dopamine as the neurotransmitter involved. Dysregulation of GABAergic transmission is also implicated in altered reward system function and addiction.
Step-by-step explanation:
In schizophrenia, physiological theories have focused on the role of dopamine as the neurotransmitter involved. There is strong evidence showing a strong interaction between dopamine, glutamate, and GABA in the basal ganglia. Dysregulation of GABAergic transmission is also present in altered reward system function and addiction.