Journal
JOURNAL OF COMPARATIVE PSYCHOLOGY
Volume 118, Issue 1, Pages 58-64Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0735-7036.118.1.58
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Squirrel monkeys (Saimiri sciureus) that had learned to reach toward I piece of food instead of 4 in a reverse-reward contingency were tested after an 8-month delay with no intervening relevant experiences. All monkeys except 1 continued to show inhibitory control by reliably reaching toward the smaller quantity, most of them doing so within 2 sessions. Performance was maintained when a low-preference food replaced prized foods as arrays and rewards. When the quantities 1 and 4 were replaced with different ones, there was strong evidence of transposition at group level, although individual differences in bias toward the smaller quantities became apparent. Individual differences in mastering the original task more than 8 months previously were quite stable, suggesting robustness in the operations required for this form of self-control.
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