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Related Experiment Videos

Concurrent schedules: undermatching and control by previous experimental conditions.

M C Davison, I W Hunter

    Journal of the Experimental Analysis of Behavior
    |September 1, 1979
    PubMed
    Summary

    Pigeon key pecking behavior shows a preference bias towards recent reinforcement history. This hysteresis effect, or memory of past conditions, influences choices, especially early after changes in reinforcement schedules.

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    Area of Science:

    • Behavioral psychology
    • Animal behavior studies
    • Operant conditioning

    Background:

    • Concurrent variable-interval schedules are used to study choice behavior.
    • Understanding how reinforcement history affects current choices is crucial in behavioral science.

    Purpose of the Study:

    • To investigate the influence of reinforcement history on pigeons' key-pressing preferences.
    • To analyze the temporal dynamics of choice behavior following changes in reinforcement schedules.

    Main Methods:

    • Five pigeons were trained on concurrent variable-interval schedules.
    • Reinforcement rates were systematically varied, and performance was observed over multiple sessions.
    • Analysis focused on session performance immediately after condition changes and later sessions.

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    Main Results:

    • Pigeons exhibited a preference bias towards the immediately preceding condition's reinforcement history.
    • This bias diminished over successive sessions, with preference becoming more sensitive to current reinforcement rates.
    • Session preference was influenced by both current and recent past reinforcement, indicating a hysteresis effect.

    Conclusions:

    • Reinforcement history plays a significant role in shaping choice behavior in pigeons.
    • Hysteresis in choice behavior can explain undermatching in transient conditions but may not account for stable-state undermatching.