use (e.g., the room in which the drug is taken or the people with which individuals take drug). Over time, the drug enhances the dopamine-related, classically-conditioned cues associated with drug taking. As a result, later encounters with these cues will produce and heighten dopamine activity and subsequently prompt individuals to crave drugs. Moreover, excessive mesolimbic dopamine activity plays a role in schizophrenia, a behavioral disorder characterized by delusions, hallucinations, blunted emotion, agitation, etc. On the other hand, a lack of mesolimbic dopamine activity may induce deficits in attention. See also Pontine tegmentum Notes External links Photo Midbrain