Abstract
Pigeons were exposed to a fixed-interval schedule of contingent reinforcement (t = 120 sec). Subsequently, noncontingent reinforcement was added to the baseline schedule. Subjects received contingent reinforcement for the first keypeck in each interval and noncontingent reinforcement at a specified temporal locus in the interval. Subjects were exposed to different loci of noncontingent reinforcement (20, 60, and 100 sec) during different phases of the study, and the. probability of noncontingent reinforcement was systematically varied at each locus across sessions. Several subjects showed decreases in response rates as the probability of noncontingent reinforcement was increased. Other subjects either did not show systematic changes in rate or showed increases in rate with increases in noncontingent reinforcement probability. Changes in temporal separation between contingent and noncontingent reinforcement did not produce systematic differences in the relation between response rate and noncontingent reinforcement probability. Postreinforcement pauses after contingent and noncontingent reinforcement varied consistently with temporal location, but not with probability, of noncontingent reinforcement.
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