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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: Physiol Behav. 2016 Sep 14;167:282–288. doi: 10.1016/j.physbeh.2016.09.007

Figure 1.

Figure 1

Rats were tested five days each week, on a FR5 schedule for five trials, then on a FR10 schedule for five trials. Afterwards, rats were tested four days a week on a FR20 schedule for the remaining trials with PR probe tests on Fridays.