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Related Experiment Videos

Choice between fixed-interval schedules: Graded versus step-like choice functions.

R L Shull

    Journal of the Experimental Analysis of Behavior
    |July 1, 1992
    PubMed
    Summary
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    Pigeons demonstrated graded choice behavior between food reinforcement schedules, not all-or-none selection. Their choices were sensitive to the differences in fixed-interval schedule durations, impacting reinforcement rates.

    Area of Science:

    • Behavioral science
    • Animal behavior studies
    • Operant conditioning research

    Background:

    • Pigeons were trained to choose between two fixed-interval (FI) schedules of food reinforcement.
    • Each key press initiated an FI schedule, requiring completion before the next choice.

    Purpose of the Study:

    • To investigate pigeon choice behavior between two concurrent fixed-interval schedules.
    • To determine how varying disparities in schedule durations influence choice and reinforcement rates.

    Main Methods:

    • Pigeons selected between two keys, each linked to a distinct fixed-interval schedule.
    • Schedule durations ranged from 15 to 40 seconds across experimental conditions.
    • Choice behavior was analyzed based on the relative durations of the two schedules.

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    Main Results:

    • Pigeon choice was not absolute; they did not exclusively select the shorter schedule.
    • Relative choice and the rate of initiating schedules varied gradually with the difference in schedule durations.
    • Choice ratios were highly sensitive to the ratios of the fixed-interval schedule lengths.

    Conclusions:

    • Pigeon choice between reinforcement schedules is graded, not binary.
    • The magnitude of difference between fixed-interval schedules significantly influences choice behavior and reinforcement efficiency.
    • This study highlights the sensitivity of choice behavior to schedule parameters in operant conditioning.