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Davison, Michael; Elliffe, Douglas; Marr, M. Jackson – Journal of the Experimental Analysis of Behavior, 2010
Four pigeons were trained on two-key concurrent variable-interval schedules with no changeover delay. In Phase 1, relative reinforcers on the two alternatives were varied over five conditions from 0.1 to 0.9. In Phases 2 and 3, we instituted a molar feedback function between relative choice in an interreinforcer interval and the probability of…
Descriptors: Behavioral Science Research, Animals, Animal Behavior, Reinforcement
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Machado, Armando; Rodrigues, Paulo – Journal of the Experimental Analysis of Behavior, 2007
Two experiments examined how pigeons differentiate response patterns along the dimension of number. In Experiment 1, 5 pigeons received food after pecking the left key at least N times and then switching to the right key (Mechner's Fixed Consecutive Number schedule). Parameter N varied across conditions from 4 to 32. Results showed that run length…
Descriptors: Item Response Theory, Probability, Mathematical Models, Animals
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Zentall, Thomas R.; Singer, Rebecca A. – Journal of the Experimental Analysis of Behavior, 2007
When behavior suggests that the value of a reinforcer depends inversely on the value of the events that precede or follow it, the behavior has been described as a "contrast" effect. Three major forms of contrast have been studied: "incentive contrast," in which a downward (or upward) shift in the magnitude of reinforcement produces a relatively…
Descriptors: Probability, Reinforcement, Behavior Modification, Animals