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. Author manuscript; available in PMC: 2020 Dec 1.
Published in final edited form as: Psychopharmacology (Berl). 2019 Jul 26;236(12):3677–3685. doi: 10.1007/s00213-019-05339-4

Figure 2.

Figure 2.

Dose-response curves for the self-administration of cocaine, methamphetamine, MDPV, and α-PVP in each of 4 rhesus monkeys (M1-M4) responding under a progressive ratio (PR) schedule of reinforcement. Data represent the mean (± 1 SEM) for the total number of infusions earned for cocaine (0.0032-0.32 mg/kg/inf), methamphetamine (0.0032-0.1 mg/kg/inf), MDPV (0.001-0.1 mg/kg/inf) and α-PVP (0.001-0.1 mg/kg/inf; left ordinate), as well as the corresponding final ratio completed (right ordinate).