Abstract
Monkeys were trained to avoid or approach a cue-object depending upon the presence of one or the other of 2 additional cue-objects, e.g., if the pair AC were presented the animal was to select A, if BC were presented he was to select C. The monkey learned the problem in fewer trials, 40 as compared with 300, and made more errors in the AC than in the BC situation than did the chrimpanzees in Thompson''s study. However, in a transfer test fewer errors appeared after AC than BC training.
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