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Related Experiment Videos

Brightness contrast from inhomogeneous surrounds

J A Schirillo1, S K Shevell

  • 1Department of Psychology, University of Chicago, IL 60637, USA.

Vision Research
|June 1, 1996
PubMed
Summary

Brightness perception is complex. A test patch appears dimmer in a checkerboard surround than a uniform one, especially for incremental changes, challenging simple luminance averaging models.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Achromatic vision

Background:

  • Brightness perception is influenced by surrounding context.
  • Inhomogeneous surrounds present unique challenges to understanding visual processing.
  • Previous models often rely on space-averaged luminance, which may not capture complex interactions.

Purpose of the Study:

  • To investigate how inhomogeneous surrounds affect perceived brightness.
  • To compare brightness perception in checkerboard versus uniform surrounds.
  • To evaluate existing models of brightness perception and explore alternatives.

Main Methods:

  • Participants adjusted the luminance of a test patch in an inhomogeneous surround to match a comparison patch in a uniform surround.
  • Stimuli were achromatic, with surrounds matched for space-averaged luminance.
  • Both incremental and decremental comparison patches were used.

Main Results:

  • An incremental test patch appeared dimmer within a checkerboard surround compared to a uniform surround.
  • A decremental test patch's perceived brightness was less affected by surround inhomogeneity.
  • Perceived brightness was not solely determined by space-averaged luminance or an equivalent uniform surround.

Conclusions:

  • Brightness perception is not adequately explained by space-averaged luminance in inhomogeneous surrounds.
  • The nature of the surround (inhomogeneous vs. uniform) significantly impacts perceived brightness.
  • Alternative models are needed to explain brightness perception for stimuli with complex surrounds.

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