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Related Experiment Videos

Effects of concurrent schedules on human fixed-interval performance.

R Poppen

    Journal of the Experimental Analysis of Behavior
    |July 1, 1972
    PubMed
    Summary

    Human behavior on fixed-interval schedules is shaped by concurrent reinforcement. Different schedules, like differential reinforcement of low rate versus fixed ratio, significantly alter lever-pressing rates and pauses.

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    Area of Science:

    • Behavioral psychology
    • Operant conditioning

    Background:

    • Fixed-interval schedules are fundamental in understanding reinforcement patterns.
    • Previous research indicated conditioning history strongly influences fixed-interval performance.

    Purpose of the Study:

    • To investigate how concurrent reinforcement schedules impact fixed-interval performance in young adults.
    • To compare the effects of differential reinforcement of low rate (DRL) versus fixed ratio (FR) schedules when paired with fixed-interval (FI) schedules.

    Main Methods:

    • Young adults completed a lever-pressing task under two concurrent schedules: FI 1-min-DRL 20-sec and FI 1-min-FR 100.
    • Subjects were trained on both schedule conditions.

    Main Results:

    • FI performance concurrent with DRL showed high, constant rates without post-reinforcement pauses.
    • FI performance concurrent with FR exhibited low rates and significant post-reinforcement pauses.
    • These findings contrast with prior studies using non-concurrent procedures.

    Conclusions:

    • Concurrent contingencies are a critical determinant of human fixed-interval performance.
    • The specific nature of the concurrent schedule significantly alters response patterns, challenging previous assumptions based solely on conditioning history.

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