Probabilistic discrimination learning in the pigeon.

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Abstract
Conducted 2 experiments with 10 White Carneaux pigeons using a successive discrimination method, 100 discrete trials per session, a correction procedure, and tilted lines as stimuli. In Exp. I, at the end of approximately 50 sessions, the relative frequency of choosing an alternative in the presence of a stimulus deviated from the probability-matching value toward maximizing. In Exp. II, all possible combinations of 4 tilted lines provided 15 stimuli. At the end of 70 sessions, the function relating the relative frequency of choosing an alternative in the presence of a stimulus to the average of the reinforcement probabilities for the components in that stimulus was S-shaped and was consistent with the outcome of Exp. I and of a previous probability-learning experiment. Results point out various inadequacies of 3 theories of choice behavior. (21 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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