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. Author manuscript; available in PMC: 2010 May 16.
Published in final edited form as: Behav Brain Res. 2008 Dec 14;199(2):326–333. doi: 10.1016/j.bbr.2008.12.011

Figure 2.

Figure 2

Baseline investigatory behavior in the apparatus depicted in Figure 1. The top panel of graphs shows that in a 30 min test session, the time spent investigating at the social hole increases (top left) while the number of head pokes decreases (top middle), yielding an overall increase in mean poke duration (top right). Moreover, no habituation was observed in behavioral responding across 4 successive days of testing, and a robust preference to explore the hole where social reinforcement is possible was observed on all test days. In the bottom panel of graphs, data are cumulated across the entire 30 min test session. Although a significant preference for social investigation was observed in both sexes, female rats spent significantly more time in social investigation than male rats. All data are expressed as means ± SEM; an asterisk (*) indicates a significant difference between male and female rats at the social hole (p<.05).