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Related Experiment Videos

White's effect: a dual mechanism.

B Moulden1, F Kingdom

  • 1Department of Psychology, University of Reading, Whiteknights, U.K.

Vision Research
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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Grey bars appear darker on a white grating than on a black grating. This brightness perception phenomenon is influenced by bar dimensions, suggesting two underlying visual processes are at play.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • A phenomenon exists where grey bars appear darker on a white grating compared to a black grating.
  • Understanding the mechanisms of this brightness illusion is crucial for visual perception models.

Purpose of the Study:

  • Investigate the properties of the grey bar brightness illusion.
  • Determine the underlying neural and computational mechanisms responsible for the effect.

Main Methods:

  • Conducted four experiments manipulating flank and coaxial inducing bar dimensions (heights and widths).
  • Quantified the impact of these manipulations on the perceived brightness of central grey bars.

Main Results:

  • Identified that both local corner effects and spatially extensive processes contribute to the illusion.

Related Experiment Videos

  • Demonstrated that the dimensions of inducing bars significantly modulate the perceived brightness.

    • Conclusions:

    • The findings support a dual-process model for brightness perception.
    • Further research is suggested to refine models of visual processing and spatial filtering.