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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: Drug Alcohol Depend. 2008 Dec 3;100(3):272–276. doi: 10.1016/j.drugalcdep.2008.10.01

Figure 2.

Figure 2

Dose-response curves for self-administration of cocaine and cocaine:PB mixtures under a PR schedule of reinforcement. Squares represent cocaine alone; diamonds represent cocaine with PB 0.05 mg/kg/injection; triangles represent cocaine with PB 0.1 mg/kg/injection; circles represent cocaine with PB 0.2 mg/kg/injection. Symbols represent the mean values for four monkeys and vertical line are s.e.m.