Abstract
When the center one of three keys was illuminated with one of six stimuli, 40 pecks produced white light on both side keys. Three of the six stimuli set the conditions for reinforcement of a subsequent single peck on the left key, and three occasioned reinforcement for a right-key response. Three pigeons reached a criterion of 18 correct side-key responses in the last 20 presentations of each of the six stimuli. Prior to criterion, responding was stable and near chance levels; immediately thereafter, accuracy rose to 90% correct choices. Results of several statistical tests and good congruence with predictions of Bower's (1961) model suggested acquisition in an all-or-none manner and confirmed Rodewald's (1973) results.
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