Abstract
Cerebral stimulation during the course of learning of a black-white discrimination at repetition rates of 75/sec. and 300/sec, continued during the 25-sec. period of food-eating following correct choices but discontinued during 25-sec. confinement in empty compartment following erroneous choices produced an adverse effect on learning of animals treated with 300/sec. stimulus rate, but had no effect on those treated at the slower rate. Comparisons with data from an earlier study where post-choice stimulation was continued following errors rather than correct choices are made.

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