Abstract
Two experiments were run in order to ascertain the learning set (LS) phenomenon in rats. The task was a series of two-choice pattern discrimination problems in Y-maze and 100 trials were given per problem. In both Experiments I and II, the rats' correct responses gradually increased over ten independent pattern discrimination tasks, thus showing interproblem transfer effect or the LS phenomenon. In Experiment II, there was evidence of extradimensional transfer effect; rats exposed to a series of pattern discrimination problems showed better performance in a subsequent black-white discrimination task. Theoretical discussions of the results were attempted with reference to Harlow's and Reese's theories on LS.
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