The passive avoidance test STL1 (short memory) and STL2 (long memory) results of testosterone replacement-treated with flutamide (10 mg/kg, ip, for 6 d), letrozole (4 mg/kg, ip, for 6 d) and tamoxifen (1 mg/kg, ip, for 6 d) in intact and STZ (A), castrated and (STZ+Cas)- lesion rats (B). Each bar represent the mean±SEM of STL time (s). n=8 rat for each group. cP<0.01 compared with intact or testosterone replacement of castrated rats. Also fP<0.01 compared with testosterone replacement of STZ or STZ+Cas groups. (STZ=stroptozotocin, Cas=castration, T=testosterone, Flu=flutamide, Let=letrozole, Tmx=tamoxifen, ip=intraperitoneal).