Abstract
Independent groups of pigeons received different durations of reinforcement delay (0, 2.5, 5, 10, or 20 sec) during the second component of a multiple variable-interval 1-min variable-interval 1-min schedule of reinforcement; all birds received immediate reinforcement during the first component. In general, response rates during the delayed reinforcement component decreased as the duration of reinforcement delay was increased. Groups that received 5-, 10-, and 20-sec durations of reinforcement delay responded at a higher rate during the immediate reinforcement component than the groups that received 0- and 2.5-sec durations of reinforcement delay. A subsequent generalization test showed clear differences between the groups, with stronger and more consistent inhibitory control being exerted by the stimulus associated with a 20-sec duration of reinforcement delay.
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