Left panel: between-subjects assessment. Right panel: within-subjects assessment. (A) Extinction responding: Total number of active lever presses in rats tested in the extinction context (context A, with cue) after 1 day, 1 week, or 1 month of withdrawal. (B) Extinction time course: Number of active lever presses over six 1-h extinction sessions in rats tested in context A (with cue) after 1 day, 1 week, or 1 month of withdrawal. (C) Priming-induced reinstatement: Total number of active lever presses for priming induced reinstatement (0, 0.25, and 0.5 mg/kg, i.p.) after 1 day, 1 week, or 1 month of withdrawal * Differences between 1 day and 1 month, # differences between 1 day and 1 week, p<0.05.