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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Brain Res. 2016 Oct 19;1654(Pt A):34–42. doi: 10.1016/j.brainres.2016.10.018

Figure 3. HR rats exhibited greater levels of responding than LR rats on the first day of extinction.

Figure 3

(A) Active lever presses during 10 days of extinction in HR and LR rats. (B) HR rats responded significantly more than LR rats on extinction day 1. By the last day of extinction, active lever responses were equivalent between HR and LR groups. ** p<0.01.