Mean (+SEM) numbers of avoidance responses (A), 22 kHz USV counts (B), amount of defecations (C), percent change of the averaged startle activity under the CS+startle and the startle-alone conditions from the baseline to the drug days (D), and to the drug-free days (E) of the four groups of rats that were treated with risperidone (1.0 mg/kg, sc) or vehicle (sterile water) and tested under the immediate CS termination (RIS-I and VEH-I) or the delayed CS termination condition (RIS-D and VEH-D). * p<0.05 significantly different from the vehicle group.