Novelty learning sets in rhesus monkeys.

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Abstract
"Thirty-three rhesus monkeys--7 normal, 13 given low-dose irradiation, and 13 given high-dose irradiation--were presented with 12 object-quality discrimination problems each day for 16 days. Four trials were allowed on each problem. Each problem involved one new, or novel, stimulus and one stimulus which had appeared in the preceding problem. Half the time, the stimulus brought forward had been positive (rewarded) and half the time negative (nonrewarded) in the preceding problem. In each problem, the new, or novel, stimulus was made positive (rewarded) and the stimulus retained from the preceding problem, regardless of previous sign, became negative. The monkeys attained significant first-trial solution of the successive problems. Previous exposure to whole-body radiation did not produce significant differences in performance in this experiment. A significantly greater likelihood of error resulted when the positive stimulus was retained with reversed sign than when the negative stimulus was retained without reversed sign." From Psyc Abstracts 36:02:2EN30B. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
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