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Related Experiment Videos

Feedback functions for variable-interval reinforcement.

J A Nevin, W M Baum

    Journal of the Experimental Analysis of Behavior
    |September 1, 1980
    PubMed
    Summary
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    The average reinforcement rate on variable-interval schedules depends on how often animals respond. This study derives a mathematical expression for this feedback effect, explaining reinforcement rates based on response patterns.

    Area of Science:

    • Behavioral psychology
    • Operant conditioning
    • Mathematical modeling

    Background:

    • Variable-interval (VI) schedules are fundamental in understanding reinforcement learning.
    • The rate of reinforcement obtained is known to be influenced by the rate of responding.
    • A precise mathematical description of this feedback effect in free-operant behavior is needed.

    Purpose of the Study:

    • To derive a mathematical expression for the feedback effect in free-operant responding under variable-interval schedules.
    • To model how the average rate of reinforcement depends on the average rate of responding.

    Main Methods:

    • Assumed free-operant responding occurs in bursts at a constant tempo, interspersed with other activities.
    • Modeled durations of bursts and other activities using exponential distributions.

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  • Incorporated the inverse relationship between rates of initiating and terminating bursts.

    • Main Results:

    • Derived a novel expression quantifying the feedback effect of response rate on reinforcement rate.
    • The derived expression successfully accounted for data from three independent experiments.
    • Demonstrated the utility of the burst/pause model in explaining reinforcement schedules.

    Conclusions:

    • The derived mathematical expression accurately describes the feedback effect in variable-interval schedules.
    • The burst-and-pause model of responding provides a robust framework for understanding operant behavior.
    • This work offers a quantitative approach to analyzing reinforcement schedules and response rates.