Effect of 8-OH-DPAT, NAN-190 and WAY-100635 on passive avoidance retention in rats pretreated with EEDQ (10 mg kg−1 s.c.) 48 h before. 8-OH-DPAT (0.1 mg kg−1 s.c.) given 30 min and NAN-190 (1 mg kg−1 i.p.) or WAY-100635 (0.5 mg kg−1 i.p.) 45 min before the acquisition session. Values are mean±s.e.mean of 10–25 animals. *P<0.05, **P<0.01 vs control; †P<0.05, ††P<0.01 vs 8-OH-DPAT (one-way ANOVA, F5,96=11.7, followed by Student-Newman-Keul's test).