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. Author manuscript; available in PMC: 2015 Feb 14.
Published in final edited form as: Behav Neurosci. 2005 Apr;119(2):464–472. doi: 10.1037/0735-7044.119.2.464

Figure 5.

Figure 5

A: Responses on the inactive lever during the first 3 days of exposure to the operant task in rats receiving either food (n = 32) or cocaine (n = 15) access. B: Responses on the inactive lever during the first 3 days of cocaine self-administration in rats that were either trained (with food, n = 32) or untrained (n = 15) on the operant task prior to cocaine access. Note that untrained rats in Figure 4B are the same group as cocaine self-administration rats in Figure 4A. Analysis of variance demonstrated a significant main effect for group ( p < .001), and post hoc tests revealed a significant difference between groups on Day 1 and Day 2. *p < .05. Error bars represent standard error.