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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: Pharmacol Biochem Behav. 2016 Mar 19;145:17–23. doi: 10.1016/j.pbb.2016.03.008

Figure 2.

Figure 2

Mean (±SEM) lever presses over the 21 sessions of extinction. The horizontal bar with an asterisk indicates a significant decrease in responding over 21 sessions of extinction in both males (n=43) and females (n=45). * = p < 0.05.