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. Author manuscript; available in PMC: 2006 Dec 15.
Published in final edited form as: Behav Processes. 2006 Sep 20;73(3):360–366. doi: 10.1016/j.beproc.2006.08.007

Fig. 4.

Fig. 4

Number of active and inactive lever responses for EC (A), SC (B), and IC (C) rats in the Control group during the last session with no light (Session 8) and the four sessions with light (Sessions 9–12) in Experiment 2. Data are expressed as mean ± S.E.M. lever presses for each session. Asterisk (*) denotes a significant within-subject difference (p < .05) compared to Session 8.