The experimental protocol was similar to that performed in experiment 1. However, in this experiment, rats (n= 24) received saline injections (i.p.) on days 1, 3, 5, 7, 14 and 21, and a single cocaine challenge (15 mg/kg, i.p.) was performed on day 28. Daily administration of SR 48692 (1 mg/kg, i.p., n= 12) or vehicle (n=12) was performed from day 15 to day 28. Data represent mean ± SEM of crossovers (A) or rearings (B) summed over 5 minutes.