Figure 2.

Effect of vehicle, DL77, and RAMH on MK801-induced deficit in an inhibitory PAP in rats. Gray columns represent the mean STLs measured during the training trial before the delivery of the foot-shock (pre-shock latencies) and black columns the mean STLs measured during the retention test (test latencies). Rats were injected with DL77 (5 mg/kg, i.p.), RAMH, or a combination of RAMH (10 mg/kg)+DL77 (5 mg/kg) 15 min (RAMH) or 30 min (DL77) before the test session. ^$P < 0.001 for mean STLs vs. the value of the (Saline)-treated group. ^**P < 0.001 for mean STLs vs. the value of the (MK801)-treated group. Data are expressed as mean ± SEM (n = 7).