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Related Experiment Videos

Discriminative effects of massed extincttion.

M Yarczower

    Journal of the Experimental Analysis of Behavior
    |July 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

    Massed extinction steepened generalization gradients in pigeons, especially after prior discrimination or reinforcement training. This effect was observed using a response-rate criterion, differing from previous time-dependent methods.

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    Stimulus control during conditional discrimination.

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    Area of Science:

    • Behavioral psychology
    • Animal cognition

    Background:

    • Stimulus control is crucial for understanding learning and behavior.
    • Generalization gradients illustrate how learned responses extend to novel stimuli.
    • Previous research indicated massed extinction does not always steepen generalization gradients.

    Purpose of the Study:

    • To investigate factors influencing the steepness of generalization gradients.
    • To examine the effect of massed extinction preceded by different training paradigms on stimulus control in pigeons.
    • To compare the impact of a response-rate extinction criterion versus a time-dependent criterion.

    Main Methods:

    • Pigeons were exposed to massed extinction sessions targeting a 570 nm stimulus.
    • Preceding training included discriminative training, non-differential reinforcement, or simple reinforcement with a 550 nm stimulus.

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  • Extinction continued until response rates to the target stimulus reached one-tenth of baseline rates.

    • Main Results:

    • Massed extinction steepened generalization gradients along the wavelength dimension.
    • This effect was observed following discriminative training, non-differential reinforcement, and simple reinforcement.
    • The use of a response-rate criterion for extinction may explain differences from prior studies.

    Conclusions:

    • Massed extinction can effectively steepen generalization gradients in pigeons.
    • The nature of prior training significantly influences the efficacy of massed extinction.
    • Response-rate criteria in extinction procedures may yield different outcomes than time-dependent criteria.