Figure 4.

Active lever responses recorded during extinction training and reinstatement testing in Experiment 2. (A) Mean (±SEM) number of active lever responses per 90-min extinction session during the first extinction phase, followed by the initial cue reinstatement test session. (B) Mean (±SEM) number of active lever responses per 90-min extinction session during the second extinction phase, followed by the final cue reinstatement test session. Filled symbols indicate pretreatment with 30 mg/kg CDPPB on Days 1–7, and open symbols indicate corresponding vehicle treatment. *p < 0.05 difference between reinstatement testing and average of final two extinction sessions, in all treatment groups (paired t-tests). +p < 0.05 difference between CDPPB/veh group and both veh/veh and veh/CDPPB groups (paired t-tests).