Figure 1.

Behaviors Exhibited During Repeated Social Defeat. Adult female rats (d69–71 of age; n=19) and adolescent female rats (d29–31 of age; n=15) were subjected to 7 days of repeated social defeat with an aggressive lactating female resident. Adolescent and adult rats exhibited distinct behavioral repertoires in response to an aggressive conspecific. Over the 7 days, adolescent rats exhibited significantly fewer numbers of upright postures and boxing behaviors and fewer instances of under the cover of and being aggressively groomed by the lactating female resident compared to adults. Self-grooming and freezing/crouching behaviors were also assessed but not significantly different between adolescent and adult female rats. The average of these behaviors over the 7 days are shown in the first and third rows and the second and fourth rows shows these behaviors on each of the 7 days.

# p≤ .05 indicates a significant Age effect with a significant difference between adolescent and adult female rats

& p≤ .05 indicates a significant Day effect with a significant difference across the 7 days, regardless of age