Figure 5.

Aggressive behavior of mice in the resident–intruder paradigm over 3 consecutive days. A, Latency to anogenital chemoinvestigation of intruders with no significant effect of genotype (F_(1,40) = 0.62, p = 0.44). B, Percentage of males showing aggressive bouts on days 1, 2, and 3 (^ap < 0.05 vs control mice). C, Latency to attack intruder mice. For residents that did not show aggressive behavior on days 2 and 3 of the test, the latency was 600 and 1200 s, respectively. There was a significant effect of genotype (F_(1,24) = 8.55, p < 0.05). n = 20 per genotype; post hoc analysis showed significant decreased latency for control mice to attack at days 2 or 3 versus day 1 (^ap < 0.05).