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Related Experiment Videos

A spatial frequency dependent grating-induction effect

M E McCourt

    Vision Research
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    A surrounding visual grating can induce the appearance of a second grating in a test field. This visual illusion

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    Area of Science:

    • Visual perception
    • Neuroscience
    • Grating induction

    Background:

    • Visual stimuli can create illusory perceptions.
    • Surrounding patterns influence the perception of central stimuli.

    Purpose of the Study:

    • To investigate the phenomenon of grating induction.
    • To quantify the perceived contrast of induced gratings.
    • To determine the neural basis of this visual effect.

    Main Methods:

    • Presenting a vertical sinewave luminance grating around a test field.
    • Measuring perceived contrast using a cancellation technique.
    • Varying spatial frequency and test field dimensions.

    Main Results:

    • Induced gratings appeared with opposite phase and high perceived contrast (up to 90% of inducing contrast).

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  • Perceived contrast decreased with higher spatial frequencies and larger test field dimensions.
  • Sinewave gratings induced stronger effects than square wave gratings.

    • Conclusions:

    • The visual system generates illusory gratings through an induction process.
    • The neural locus of this effect is likely in the cortex, beyond initial spatial frequency channels.