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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: Addict Biol. 2016 Dec 1;23(1):102–110. doi: 10.1111/adb.12479

Figure 3.

Figure 3

Self-administration of cocaine or MDPV, load-up. (A) Latency to receive infusions 1-10 of cocaine (grey bars) or MDPV (black bars) relative to lever extension. (B) 50-kHz USVs per infusion where infusion “0” represents USV rate prior to infusion 1. (C, upper) Cumulative time to earn infusions 1-10 plotted using horizontal lines with corresponding 50-kHz USVs across anticipation and load-up (C, lower). Vertical dashed line represents lever extension. * p < 0.05, ** p < 0.01, *** p < 0.001 main effect of Drug Type. Data in A and B are mean ± S.E.M. n's=7-8.