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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 4.

Figure 4

The impact of light/dark cycle on investigatory behavior. During the 30 min test sessions, the time spent investigating (top panel), the number of head pokes (middle panel), and mean poke duration (bottom panel) at both the social and non-social holes were measured in both light and dark phases of daily light cycling for 5 successive days. No effects of light/dark cycling were found; Time and number of social hole were stably greater than those of non-social hole in both light and dark phases on all test sessions. All data are expressed as means ± SEM.