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Surround articulation. I. Brightness judgments.

J A Schirillo1

  • 1Department of Psychology, Wake Forest University, Winston-Salem, North Carolina 27109, USA.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|April 8, 1999
PubMed
Summary

Brightness perception is influenced by illumination estimates. Articulation, a visual manipulation, helps distinguish between illumination and reflectance changes, shifting brightness judgments for increments but not decrements.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Color science

Background:

  • Brightness judgments are complex, influenced by luminance edges.
  • Distinguishing between illumination and reflectance changes is challenging.
  • Existing research highlights shifts in brightness perception with ecological stimuli.

Purpose of the Study:

  • To investigate how articulation affects brightness judgments.
  • To determine if articulation aids in inferring illumination changes over reflectance changes.
  • To compare findings with previous studies on brightness shifts in complex stimuli.

Main Methods:

  • Articulation: adding incremental and decremental patches to a surround.
  • Preserving the surround's space-average luminance during articulation.
  • Measuring shifts in brightness judgments for test-patch increments and decrements.

Main Results:

  • Articulation enhanced the inference of illumination changes.
  • Brightness judgments shifted for test-patch increments under articulation.
  • No significant shift in brightness judgments was observed for decrements.

Conclusions:

  • Articulation serves as a cue to differentiate illumination from reflectance edges.
  • The findings support the role of illuminant estimation in brightness perception.
  • Results align with studies showing brightness shifts in more ecologically valid visual scenes.

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