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Related Experiment Videos

Peak shift following simultaneous discriminations.

A S Winton

    Journal of the Experimental Analysis of Behavior
    |November 1, 1975
    PubMed
    Summary
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    Pigeons trained with visual stimuli demonstrated peak shift, a phenomenon where generalization gradients shift away from the training stimulus. This effect occurred regardless of whether stimuli were presented simultaneously or successively.

    Area of Science:

    • Behavioral psychology
    • Animal cognition
    • Perception

    Background:

    • Differential training is used to study stimulus generalization in animals.
    • Peak shift is a well-documented phenomenon in animal learning.
    • Previous research has explored factors influencing peak shift, including stimulus presentation methods.

    Purpose of the Study:

    • To investigate peak shift in pigeons using visual stimuli that vary in flicker-rate or intensity.
    • To determine if the presentation method (simultaneous vs. successive) affects peak shift.
    • To evaluate existing explanations of peak shift based on the experimental data.

    Main Methods:

    • Pigeons were exposed to visual stimuli on two keys during differential training with concurrent schedules.
    • Stimuli varied in either flicker-rate or intensity.

    Related Experiment Videos

  • Generalization tests were conducted using the trained stimuli and novel stimuli along the same dimension.

    • Main Results:

    • All pigeons exhibited peak shift in the generalization tests.
    • The data indicated that peak shift occurred irrespective of simultaneous or successive stimulus presentation during training.
    • The findings did not support explanations of peak shift that emphasize presentation order.

    Conclusions:

    • Peak shift is a robust phenomenon in pigeons, observable with visual stimuli.
    • The method of stimulus presentation during differential training does not critically influence peak shift.
    • Further research may be needed to refine theoretical explanations of peak shift.