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Related Experiment Videos

Counterphase lightness induction.

M White, T White

    Vision Research
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Apparent lightness of visual elements changes based on their alignment with an induction grating. This counterphase induction effect is similar to grating induction and suggests a global explanation for visual perception.

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    Area of Science:

    • Visual perception
    • Psychophysics
    • Neuroscience

    Background:

    • Visual illusions demonstrate how the brain constructs reality.
    • Grating induction and related phenomena reveal principles of visual processing.

    Purpose of the Study:

    • To investigate the relationship between test elements and induction gratings.
    • To characterize the phenomenon of counterphase induction.
    • To determine the underlying perceptual mechanism.

    Main Methods:

    • Superimposing half-cycle wide mid-grey test elements onto black and white square wave induction gratings.
    • Assessing apparent lightness of test elements based on their phase relationship with the grating.
    • Comparing square and rectangular test elements.

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    Main Results:

    • Apparent lightness showed a linear function of the phase relationship with the induction grating.
    • Test elements appeared lightest when in phase with black bars and darkest when in phase with white bars.
    • The linear relationship held for both square and rectangular test elements.

    Conclusions:

    • The term "counterphase induction" accurately describes this visual effect.
    • The effect is similar to McCourt's grating induction, suggesting shared mechanisms.
    • The consistency across shapes supports a global over a local explanation for the phenomenon.