Differentiation learning by monkeys

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A variety of 6-trial differentiation problems were presented to 10 Java monkeys in the Wisconsin General Test apparatus. Only one stimulus was presented on each trial, latencies and directions of choice being measured. “The results indicate that the tendency to respond to a stimulus, as measured by latency and by probability of withholding response longer than 5 sec., is strikingly reduced when there had been one previous unrewarded presentation of the stimulus, but that additional presentations do not enhance this effect.” (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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