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Related Experiment Videos

White's effect and assimilation.

F Kingdom1, B Moulden

  • 1Physiological Laboratory, University of Cambridge, U.K.

Vision Research
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

White's effect causes grey bars to appear darker on white backgrounds than on black backgrounds. This study finds contrast, not assimilation, explains this visual illusion, supporting a dual-mechanism model.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Computational neuroscience

Background:

  • White's effect is a visual illusion where grey bars appear darker on white than black backgrounds.
  • The phenomenon's direction suggests brightness assimilation, challenging contrast-based explanations.

Purpose of the Study:

  • To investigate the mechanisms underlying White's effect.
  • To determine the relative contributions of assimilation and contrast to the phenomenon.
  • To test a dual-mechanism model of brightness induction.

Main Methods:

  • Two experiments were conducted using simplified stimuli: a single grey test bar and three inducing bars.
  • Spatial arrangements of test and inducing bars were manipulated to favor assimilation.
  • The degree of perceived brightness difference was quantitatively measured.

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Main Results:

  • Experimental results did not support assimilation as a primary driver of White's effect.
  • The observed brightness differences were inconsistent with assimilation-dominant theories.
  • Data strongly align with a model incorporating both local and spatially extensive contrast mechanisms.

Conclusions:

  • Assimilation is not a significant factor in producing White's effect.
  • White's effect is explained by a combination of local and widespread contrast mechanisms.
  • The findings support a nuanced model of brightness induction in visual perception.