In a previous study from this laboratory ((2) pp. 64-67) it was indicated that chimpanzees respond more accurately in delayed response when a large, as contrasted with a small, piece of food is used as incentive. Apparently the quantitative nature of the food-incentive used in a given trial influenced the accuracy of the response which preceded actual attainment and ingestion of that incentive. In the same study it was shown that, in addition to such a specific effect of an incentive seen but not yet received by the subject, performance was strongly influenced also by the size of incentives which had been seen and received on preceding trials. The latter phenomenon was termed the general perseverative effect of the incentive.
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