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Related Experiment Videos

The autoshaping procedure as a residual block clock.

J A Dinsmoor, J D Dougan, J Pfister

    Journal of the Experimental Analysis of Behavior
    |September 1, 1992
    PubMed
    Summary
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    Pigeons pecked less when a key turned dark, especially if it happened at the end of a food delivery interval. This suggests darkening keys in autoshaping procedures may suppress pecking behavior.

    Area of Science:

    • Behavioral Psychology
    • Animal Cognition

    Background:

    • Autoshaping procedures involve pigeons learning to peck a key associated with food delivery.
    • The 'block clock' paradigm uses temporal sequences to study learned behaviors.

    Purpose of the Study:

    • To investigate the effect of key darkening versus color change on pigeon pecking rates.
    • To explore the efficacy of darkening stimuli in modifying behavior within an autoshaping context.

    Main Methods:

    • Experiment 1: Pigeons (n=4) experienced a color sequence followed by food; colors were then replaced by key darkening.
    • Experiment 2: Pigeons (n=3) were exposed to a darkened key, a novel color, and the original color in successive conditions.
    • Pecking rates were measured across different temporal segments of the interval between food deliveries.

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    Main Results:

    • Key darkening significantly reduced pecking rates, more so than a novel color stimulus.
    • Darkening during the final interval portion suppressed pecking throughout the entire interval.
    • The effects of key darkening were more severe, extensive, and persistent than color changes.

    Conclusions:

    • Key darkening is a potent suppressor of pecking behavior in pigeons within autoshaping.
    • Autoshaping may be conceptualized as a block clock where key darkening suppresses behavior for most of the interval.
    • Temporal stimulus control can be influenced by the modality and timing of stimulus changes.