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. Author manuscript; available in PMC: 2016 Mar 15.
Published in final edited form as: Behav Brain Res. 2014 Dec 23;0:222–228. doi: 10.1016/j.bbr.2014.12.034

Figure 2. Operant Lever-Press Acquisition.

Figure 2

a) Mean reinforcers (±SEM) per session earned by STs and GTs during acquisition of food- and cocaine-maintained lever pressing (averaged over the last 5 sessions of each type). b) Mean total (±SEM) food and cocaine reinforcers earned by STs and GTs upon meeting the response acquisition criterion for each response/reinforcement alternative. * p < 0.05.