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Performance on variable-interval schedules arranged singly and concurrently.

M C Davison, I W Hunter

    Journal of the Experimental Analysis of Behavior
    |May 1, 1976
    PubMed
    Summary
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    Pigeons showed undermatching behavior when allocating responses and time across multiple variable-interval schedules. A modified quantitative account accurately described these findings, improving upon Herrnstein

    Area of Science:

    • Behavioral psychology
    • Animal behavior

    Background:

    • Operant conditioning principles govern how animals learn and respond.
    • Reinforcement schedules significantly influence response rates and allocation.

    Purpose of the Study:

    • To investigate pigeons' response allocation and preference under concurrent variable-interval schedules.
    • To test the applicability of Herrnstein's quantitative account to concurrent schedules.

    Main Methods:

    • Pigeons were exposed to concurrent variable-interval schedules with one, two, or three response keys.
    • Data collected included response counts, time spent responding, and reinforcements obtained.
    • Analysis involved comparing allocation ratios to reinforcement ratios and fitting data to quantitative models.

    Related Experiment Videos

    Main Results:

    • Response rates increased with local reinforcement rates but decreased with reinforcement rates on other keys.
    • Both response and time allocation ratios undermatching reinforcement ratios across conditions.
    • Herrnstein's original model showed inconsistencies, but a power-function modification provided a good fit.

    Conclusions:

    • Pigeons exhibit undermatching in concurrent schedule situations, indicating a deviation from perfect reinforcement proportionality.
    • A modified power-function model better describes response allocation than Herrnstein's original quantitative account.
    • Findings contribute to understanding choice behavior and reinforcement principles in animal learning.