The injection solution of haloperidol (5 mg/ml ampoules, 5 mg/ml ampoules, Sabex Inc. Boucherville, Quebec, Canada) was obtained by mixing drugs with sterile water. The injection solution of phencyclidine hydrochloride (gift from National Institute on Drug Abuse Chemical Synthesis and Drug Supply Program) was obtained by mixing drugs with 0.9% saline. Clozapine (gift from the NIMH drug supply program) and olanzapine (Toronto Research Chemical Inc., Canada) were dissolved in 1.5% glacial acetic acid distilled water. The doses of haloperidol (0.03 or 0.05 mg/kg), olanzapine (1.0 or 2.0 mg/kg), Clozapine (5 and 10 mg/kg) and PCP (1.60 or 3.20 mg/kg) were chosen based on our previous work (Sun et al., 2009 (link); Sun et al., 2010 (link); Zhang and Li, 2012 (link); Zhao et al., 2012b (link); Feng et al., 2013 (link)). All drugs were administered s.c. at 1.0 ml/kg.