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Related Experiment Videos

Session duration and the VI response function: Within-session prospective and retrospective effects.

J D Dougan, J A Kuh, K L Vink

    Journal of the Experimental Analysis of Behavior
    |November 1, 1993
    PubMed
    Summary

    Session duration significantly impacts animal behavior on variable-interval schedules. Longer sessions reveal complex response patterns influenced by both future and past events, unlike shorter sessions.

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    Physiology & behavior·1993

    Area of Science:

    • Behavioral Psychology
    • Animal Behavior Studies
    • Operant Conditioning

    Background:

    • Variable-interval (VI) schedules are fundamental in operant conditioning.
    • Previous research has debated the form of the VI response function.
    • The influence of session duration on VI responding requires further investigation.

    Purpose of the Study:

    • To investigate how session duration affects response rates under simple variable-interval schedules.
    • To explore the underlying behavioral processes (prospective and retrospective) that contribute to observed response patterns.
    • To clarify the controversy surrounding the shape of the variable-interval response function.

    Main Methods:

    • Two experiments were conducted using rats as subjects.
    • Experiment 1 involved exposure to various session durations (10 min, 30 min) and reinforcement rates.

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  • Experiment 2 used a discrimination procedure where pellet flavor signaled session duration.

    • Main Results:

    • Response rate functions were monotonic in short (10-min) sessions but bitonic in long (30-min) sessions.
    • Analysis within sessions indicated the involvement of both prospective and retrospective behavioral processes.
    • Rats adjusted their responding based on predicted session duration, responding faster in shorter sessions.

    Conclusions:

    • Session duration is a critical variable influencing responding on variable-interval schedules.
    • Both prospective and retrospective processes operate simultaneously, shaping behavior over time.
    • The findings contribute to understanding the variable-interval response function and the complexities of reinforcement schedules.