Figure 7.

Retrieval enhancers do not affect memory expression beyond the test session prior to which they were administered. Either animals implanted with cannulas aimed to the CA1 region of the dorsal hippocampus (CA1), the BLA, or the ENT or nonimplanted animals were trained in the IA task using a 0.5-mA, 2-sec foot-shock and, 24 h after training, were submitted to a retention test session (A,C; TT1) or to a 20-sec pure reactivation session (B,D). Fifteen minutes before those sessions, the animals received intra-CA1, intra-BLA, or intra-ENT infusions of noradrenaline (NOR; A,B) or intraperitoneal injections of ACTH (C,D). Memory was evaluated in a test session carried out 24 h later (TT2); that is, 48 h posttraining. ^*P < 0.001 versus VEH TT1 in Mann-Whitney test; n = 10 to 14 per group.