Figure 5.

Experiment 4.2. Effects of atenolol, applied 10 min before the first context session, on defensive behavior exhibited by rats exposed to a cat odor. The familiarization, the conditioning to the cat odor, and the two context sessions were conducted during 4 consecutive days, during which the percentage of approach time, the percentage of hide time, and the head-out time were recorded in 10 min sessions each. Hatched horizontal bars represent the mean and the confidence limits (p < 0.05) for the data obtained during the conditioning session. Percentage of approach time, percentage of hide time, and head-out time in the groups microinjected with PBS (n = 6) and 40 nmol atenolol (A40; n = 7) in the PMd and the A-out group (n = 6) 10 min before the first context exposure. *p < 0.05 compared with control group.