Fig. 2. Effect of 0 and 3 mg/kg midazolam (A ) and 0 and 9 mg/kg propofol (B ) on memory of a nonaversive event (Experiment 3), as assessed by the suppressing effect of an initial preexposure to the small dark compartment on the successive fear conditioning. Control rats were not preexposed (see Methods section for further explanation). Results are expressed on a log scale as the mean latency (and SD) to enter the small dark compartment where rats experienced electric foot shocks. *P < 0.05 (with Bonferoni's correction for three comparisons).