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Pigeons pecked keys for food reinforcers delivered by multiple schedules. Three experiments examined changes in the size of positive contrast with changes in component duration. They used a within-session procedure which measured rates of... more
Pigeons pecked keys for food reinforcers delivered by multiple schedules. Three experiments examined changes in the size of positive contrast with changes in component duration. They used a within-session procedure which measured rates of responding during the baseline and contrast phases within the same session. Contrast was largest for shorter components, a result similar to that found using traditional procedures. Therefore, the present results provide preliminary support for the use of the within-session procedure to study contrast. They also showed that the inverse relation between key-peck contrast and component duration is a robust finding which survives major changes in procedure. Finally, they suggest that different functions relate the size of contrast to component duration for key pecking and treadle pressing.