The effect of visual preference on the development of reversal-learning sets was studied in each of three species of rodents (Rattus, Sciurus, and Eutamias). Ss from each species were divided into two groups, and within each species each group was trained on a different pattern discrimination. Following initial learning, Ss were then trained on 10 reversals of their respective discrimination. Within each training group, all 3 species improved over the reversals. However, there was a significant Species X Discrimination interaction. The implications of this research on interspecies comparisons were discussed.
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