Abstract
Rats were trained to criterion (CT) and overtrained (OT) on a horizontal against vertical stripes discrimination in the jumping stand. A change in response strategy, from inspecting both stimuli to inspecting just the S−, was observed during overtraining. Replacing the S− with a novel stimulus disrupted performance in the OT Ss, but replacing the S+ did not. Performance in the CT Ss was disrupted, but not very severely, both when the S+ was replaced and when the S− was replaced. These results suggest that OT Ss in the jumping stand come to rely especially upon the S−. The overtraining effects found here are compared with those found in other types of apparatus.
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