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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 2.

Figure 2

Responding on Lever 1 (L1, top) and Lever 2 (L2, bottom) during the test session of Experiment 1. L2 was inserted 15 mins into the session. Lever pressing during the resurgence treatment (0) is at center, and the bin length varies by subject; the remaining data points correspond to the 3-minute bins that preceded (left) and followed (right) the resurgence treatment. Note that L1 and L2 ordinates differ.