Reinforcing behavioral variability: An analysis of dopamine-receptor subtypes and intermittent reinforcement

► Dopamine agonists induce both behavioral variability and stereotypy. ► d-Amphetamine and quinpirole increase variability when it is not required. ► SKF 38393 had no effect on variability, even at doses that lowered total responding. ► d-amphetamine and quinpirole had little effect on reinforced variability.