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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: Pharmacol Biochem Behav. 2009 Sep 13;94(2):262–270. doi: 10.1016/j.pbb.2009.09.005

Figure 6.

Figure 6

Mean number of infusions self-administered by low and high drug-taking rats across the three SD conditions during PR testing. Low drug-takers (SD0: n=7, SD4: n=6, and SD8: n=7) can be viewed in the left panel and high drug-takers (SD0: n=7, SD4: n=8, and SD8: n=7) in the right panel.