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Number of avoidance responses (a), 22 kHz USV counts (b) and intertrial crossings (c) made by the rats in the risperidone (0.5 mg/kg), risperidone (1.0 mg/kg) and vehicle groups on the last retraining (predrug) day and on the risperidone challenge test (sensitization assessment). * p < 0.05 relative to the VEH group, & p < 0.05 relative to the RIS 0.5 group.
