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Related Experiment Videos

Perceived lightness depends on perceived spatial arrangement

A L Gilchrist

    Science (New York, N.Y.)
    |January 14, 1977
    PubMed
    Summary
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    Journal of experimental psychology. Human perception and performance·1983

    The perceived gray shade relies on luminance between surfaces on the same plane, not adjacent ones. This suggests depth perception precedes lightness perception, challenging lateral inhibition theories for lightness constancy.

    Area of Science:

    • Visual perception
    • Neuroscience
    • Psychophysics

    Background:

    • Lightness constancy is the perceived stable lightness of an object despite changes in illumination.
    • Existing models often rely on lateral inhibition within the retinal image to explain visual phenomena.

    Purpose of the Study:

    • To investigate the primary factors influencing the perception of gray shades.
    • To determine whether luminance relationships on the same plane or adjacent retinal surfaces are more critical for lightness perception.
    • To test the explanatory power of lateral inhibition in lightness constancy.

    Main Methods:

    • Experimental manipulation of luminance relationships between surfaces.
    • Controlled visual stimuli presenting surfaces on the same plane and adjacent surfaces.

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  • Participant judgments of perceived gray shade.

    • Main Results:

    • Perceived gray shade is predominantly determined by luminance ratios between surfaces perceived to be coplanar.
    • Luminance relationships between merely adjacent retinal surfaces have a lesser impact on perceived gray shade.
    • The findings indicate depth perception influences lightness perception.

    Conclusions:

    • Depth perception is a prerequisite for accurate lightness perception.
    • Lateral inhibition mechanisms alone are insufficient to account for lightness constancy.
    • The study reframes the understanding of visual processing for surface properties.