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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 6.

Figure 6

A: Active lever presses in trained (n = 25) and untrained (n = 15) rats during the first 3 days of cocaine access. Analysis of variance demonstrated a significant main effect for group ( p = .002), and post hoc tests revealed a significant difference between groups on Day 2. *p < .05. B: Cocaine self-administration median split from trained (n = 25) and untrained (n = 15) rats. High = high cocaine self-administration; low = low cocaine self-administration. Analysis of variance demonstrated a significant main effect for group ( p < .001), and post hoc tests showed the trained high group to be significantly different from all other groups. *p < .01. Error bars represent standard error.