HUMAN FIXED‐INTERVAL PERFORMANCE WITH CONCURRENTLY PROGRAMMED SCHEDULES: A PARAMETRIC ANALYSIS

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Abstract
Young adults pressed a lever for points, exchangeable for money, programmed on concurrent schedules in which one component was a fixed‐interval and the other component either a fixed‐ratio (Experiment 1) or a differential‐reinforcement‐of‐low‐rate (Experiment 2). Two general patterns of fixed‐interval responding, postreinforcement pause or constant rate, occurred in both experiments as a function of the parameter values of each component. Also patterns of interaction between the component schedules developed, in which responding or point delivery on one component appeared to be discriminative for responding on the other component. Once a pattern of responding was established, it tended to persist when the parameter values of the schedule were changed. On many schedules, subjects with an experimental history responded differently than did naive subjects, although certain schedule values were resistant to the history effects. The role of verbal strategies in mediating history effects was discussed.

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