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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Pharmacol Biochem Behav. 2015 Jan 31;131:51–56. doi: 10.1016/j.pbb.2015.01.019

Figure 3.

Figure 3

Baseline breakpoints for self-administered cocaine under the PR schedule in adult SHR receiving vehicle during adolescence and adulthood (VEH/VEH), methylphenidate during adolescence and vehicle during adulthood (MPH/VEH), methylphenidate during adolescence and adulthood, with adult treatment occurring 1-hr before self-administration sessions (MPH/MPH 1-hr Pre), or methylphenidate during adolescence and adulthood, with adult treatment occurring 1-hr after self-administration sessions (MPH/MPH 1-hr Post). Values are the mean ± S.E.M. last FR completed. * p ≤ 0.04 compared to the VEH/VEH control.