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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: J Exp Anal Behav. 2020 Feb 20;113(2):468–484. doi: 10.1002/jeab.586

Figure 2.

Figure 2.

Timeline of the reinforcement schedules and doses of cocaine used across the 50 sessions of self-administration. d = day, FR = fixed ratio, VR = variable ratio, mg/kg = milligrams of drug per kilogram body weight per intravenous infusion.