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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Pharmacol Biochem Behav. 2018 Feb 2;166:48–56. doi: 10.1016/j.pbb.2018.01.008

Figure 1.

Figure 1

(A) Mean (± SEM) distance traveled in 5-minute blocks during locomotor testing. Mean (± SEM) number of response on the active and inactive levers (B) and infusions per session (C) during acquisition in Experiment 1. (D) Mean (± SEM) number of infusions at each morphine SA unit dose during demand testing. (E) Exponential demand curve describing morphine consumption as a function of unit price for rats as a group. Demand curves for individual rats with relatively low (rat #6) and high (rat #14) elasticity of demand are also shown.