Figure 5.

Antagonism of dopamine D2-receptors has no effect on decision-time during context-dependent extinction learning, or renewal of the learned response. The graphs represent the amount of time that was needed to reach the end of an arm (both correct and incorrect choices) after door opening. For each day the time for five contiguous trials was averaged (i.e., four time-points per day are shown). Decision times recorded in animals that were treated with the dopamine D2-receptor antagonist, Remoxipride, or vehicle are shown. The vehicle or antagonist solution was injected 30 min prior to extinction learning in day 4. The dopamine D2-receptor antagonist had no significant effect on decision time during extinction learning on day 4, or renewal on day 5.