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. Author manuscript; available in PMC: 2016 Jan 1.
Published in final edited form as: Drug Alcohol Depend. 2014 Nov 20;0:52–60. doi: 10.1016/j.drugalcdep.2014.11.003

Fig. 6.

Fig. 6

Continuous 14-day D-amphetamine treatment effects on demand for cocaine and food. Model predictions were derived from averaging the parameter estimates of the best-fitting model for individual monkeys. Ordinates: normalized consumption (reinforcers earned/total reinforcers). Abscissae: unit price of cocaine (UP = FR/dose). The unit price at which cocaine and food consumption are predicted to be equal is indicated in the insets as UP50.