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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Learn Motiv. 2011 May 1;42(2):154–164. doi: 10.1016/j.lmot.2011.01.002

Figure 5.

Figure 5

Responding on Lever 1 during the sessions of acquisition and extinction in Experiment 3. Groups that received no free pellets or free pellets during extinction are each shown in the left and right panels, respectively.