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Related Experiment Videos

Hunger and contrast in a multiple schedule.

R J Herrnstein, D H Loveland

    Journal of the Experimental Analysis of Behavior
    |May 1, 1974
    PubMed
    Summary

    Pigeons

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    Area of Science:

    • Behavioral psychology and animal cognition.

    Background:

    • Understanding how hunger affects animal behavior is crucial in behavioral psychology.
    • Previous research suggests a link between physiological states and reinforcement schedules.

    Purpose of the Study:

    • To investigate the impact of body weight variations (hunger) on pigeon behavior within a multiple schedule of reinforcement.
    • To test the matching-law interpretation of contrast in multiple schedules.

    Main Methods:

    • Pigeons were trained on a multiple schedule with two variable-interval components (1-min and 4-min).
    • Body weight was manipulated to alter hunger levels.
    • Response proportions in each schedule component were recorded.

    Main Results:

    • As pigeon body weight increased (indicating greater hunger), the proportion of responses in each component more closely matched the proportion of reinforcements available in that component.
    • This effect was observed across both the 1-minute and 4-minute variable-interval schedules.

    Conclusions:

    • Hunger levels significantly influence response allocation in multiple schedules, aligning with the matching law.
    • The findings support the matching-law interpretation of behavioral contrast in pigeons under varying hunger states.

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