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. Author manuscript; available in PMC: 2010 Jun 3.
Published in final edited form as: Behav Pharmacol. 2008 Dec;19(8):777–785. doi: 10.1097/FBP.0b013e32831c3b18

Fig. 2.

Fig. 2

Experiment 1: testing phase. Bars represent means + SEMs, n = 12–18 per group. Extinction sessions totaled 6 h; the responding for cue session lasted 1 h. CON, controls; ENR2, housing the rats in pairs; ENR4, grouping four rats.