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Related Experiment Videos

When is a background equivalent? Sparse chromatic context revisited

E Brenner1, F W Cornelissen

  • 1Department of Physiology I, Erasmus University Rotterdam, The Netherlands. BRENNER@FYS1.FGG.EUR.NL

Vision Research
|November 3, 1998
PubMed
Summary
This summary is machine-generated.

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A red background with white dots influences apparent color differently than a uniform background, but this effect vanishes when only the surround is altered. This suggests local contrast mechanisms with limited spatial resolution are key.

Area of Science:

  • Vision Science
  • Color Perception
  • Visual Neuroscience

Background:

  • Previous research indicated that a non-uniform background (red with white dots) affects target apparent color differently than a uniform background of equivalent averaged properties.
  • The methodology used in prior studies involved averaging background properties and superimposing the target, altering both target and surround characteristics.

Purpose of the Study:

  • To re-evaluate the influence of non-uniform backgrounds on apparent color perception.
  • To determine if the observed effects are dependent on the definition of an 'equivalent' background.
  • To investigate the role of local contrast mechanisms in color perception.

Main Methods:

  • Manipulating background properties by altering only the surround, independent of the target.

Related Experiment Videos

  • Comparing apparent color of a target presented against a non-uniform (red with white dots) surround versus a uniform surround with identical space-averaged chromaticity and luminance.
  • Analyzing the impact of these different surrounds on the target's perceived color.

    • Main Results:

    • The difference in apparent color previously reported between non-uniform and uniform backgrounds disappears when only the surround is modified.
    • Whether the surround is uniform or non-uniform (red with white dots) has no differential effect on the target's apparent color, provided their space-averaged chromaticity and luminance are matched.
    • The findings are contingent on how the 'equivalent' background is defined and manipulated.

    Conclusions:

    • The influence of background texture on apparent color is not absolute but depends on the experimental manipulation.
    • When controlling for local surround properties, the distinction between uniform and non-uniform backgrounds diminishes.
    • Results support a visual processing model based on local contrast mechanisms with limited spatial resolution.