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Related Experiment Videos

Specific and general contour adaptation effects found using a selective adaptation paradigm

E R Goedert, A S Rodwan, P G Salmon

    Perceptual and Motor Skills
    |April 1, 1977
    PubMed
    Summary

    Selective adaptation in the human visual system reveals contour adaptation involves general receptor fatigue and specific similarity effects. Complexity did not impact recognition, but density and deviation did.

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    Area of Science:

    • Visual perception
    • Neuroscience
    • Psychophysics

    Background:

    • Mammalian visual systems possess discrete property analyzers.
    • Prolonged stimulation of these analyzers leads to reduced sensitivity (selective adaptation).
    • Selective adaptation is used in psychophysical studies to investigate human visual feature extractors.

    Purpose of the Study:

    • To determine how figure density and deviation influence recognition thresholds.
    • To examine the role of complexity in recognition thresholds.
    • To understand the mechanisms of contour adaptation in the visual system.

    Main Methods:

    • Employed a selective adaptation paradigm.
    • Utilized simple and complex text figures for testing.
    • Measured recognition thresholds after adaptation.

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    Main Results:

    • Contrary to a strict property analyzer model, figure complexity did not affect recognition time.
    • Increased figure density led to increased recognition time.
    • Increased figure deviation also resulted in increased recognition time.

    Conclusions:

    • Contour adaptation appears to involve at least two distinct processes.
    • A general peripheral effect, likely due to visual receptor fatigue, is implicated.
    • A more specific effect, dependent on the similarity between test and adaptation contours, is also suggested, independent of stimulation site.