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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Behav Pharmacol. 2014 Dec;25(8):758–765. doi: 10.1097/FBP.0000000000000094

Fig. 2.

Fig. 2

Effects of prior MPD (0.56 mg/kg/inf) or saline self-administration on (A) food-maintained responding and (B) subsequent METH self-administration (0.1 mg/kg/inf). Each condition represents the mean ± SEM of 6-7 rats. Horizontal axes: Ticks indicate daily consecutive sessions. For clarity, only the last 3 sessions of the food components and all sessions for drug components are shown. Vertical axes: mean (± SEM) food pellets or infusions earned. * p<0.05, values significantly different compared with saline or saline/saline. ± p<0.05, values significantly different compared with saline/METH.