Female hooded-Lister rats received either subchronic phencyclidine (PCP) (2 mg/kg, n = 20) or vehicle (1 ml/kg, n = 20) intraperitoneally twice daily for 7 days, followed by a 7-day washout period. Rats were challenged with acute PCP or vehicle and tested for locomotor activity to ensure hyperactivity was observed in the subchronic PCP-treated rats. Rats were then tested on the elevated plus...