Two-choice behavior of rhesus monkeys in a noncontingent situation.

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Abstract
"Ten monkeys were trained in a probability learning situation, one response being rewarded on 75% of the trials, and the alternative response on the remaining 25% of the trials. After each response, S also could see whether the response he did not make would have been rewarded if it had been made." When correction of an unrewarded response was not permitted, all Ss reached an asymptote of 100% choice on the .75 side. When immediate correction was allowed, the data did not support the conclusion that all Ss were approaching an asymptote of 75% choice of the .75 side. "The behavior of monkeys in this situation is not compatible with either an 'information' or a 'secondary reinforcement' model." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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