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The effect of spatial adaptation on perceived contrast.

M A Georgeson1

  • 1Department of Psychology, University of Bristol, UK.

Spatial Vision
|January 1, 1985
PubMed
Summary

Visual adaptation to gratings follows a subtractive rule, not simple gain reduction. Perceived contrast decreases by a fixed amount, suggesting a specific neural mechanism for contrast perception.

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Area of Science:

  • Vision science
  • Psychophysics
  • Neuroscience

Background:

  • Contrast perception is fundamental to vision.
  • Adaptation influences how we perceive visual stimuli.
  • Previous models suggested gain reduction as the primary adaptation mechanism.

Purpose of the Study:

  • To investigate the mechanism of visual adaptation to contrast.
  • To differentiate between subtractive and multiplicative adaptation models.
  • To characterize the effect of contrast adaptation on perceived contrast.

Main Methods:

  • Contrast matching of sinusoidal gratings (3 cycles/degree).
  • Adaptation to gratings of varying contrasts.
  • Analysis of perceived contrast before and after adaptation.

Main Results:

  • Adaptation effects were significant for test contrasts below adapting contrast.
  • A simple gain-reduction model was insufficient to explain the data.
  • Results closely fit a subtractive rule: perceived contrast reduced by approximately one-third of adapting contrast.
  • Threshold elevation was also observed.

Conclusions:

  • Visual adaptation to contrast operates via a subtractive mechanism at the psychophysical level.
  • This finding challenges simple gain-reduction hypotheses.
  • Deviations may stem from response variance and nonlinearity.
  • A subtractive effect is compatible with single-cell level gain reduction evidence.

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