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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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Spatial organization affects lightness perception on articulated surrounds.

Masataka Sawayama1, Eiji Kimura

  • 1Graduate School of Advanced Integration Science, Chiba University, Inage-ku, Chiba-shi, Chiba, Japan. masa.sawayama@gmail.com

Journal of Vision
|April 6, 2013
PubMed
Summary
This summary is machine-generated.

Perceptual grouping influences the articulation effect, a change in lightness contrast. When elements are grouped, the articulation effect is stronger, suggesting spatial organization impacts lightness perception.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Computational neuroscience

Background:

  • The articulation effect describes altered lightness contrast due to surrounding luminance patches.
  • Understanding how local luminance signals integrate is key to explaining this effect.

Purpose of the Study:

  • To investigate the role of spatial organization and perceptual grouping in the articulation effect.
  • To determine if grouping influences lightness contrast when average luminance is constant.

Main Methods:

  • Experiments utilized grouping factors: common-fate motion, similarity of orientation, and synchrony.
  • Participants viewed lightness contrast displays with varying spatial arrangements of surrounding patches.

Main Results:

  • The articulation effect was significantly larger when target and surrounding patches were strongly perceptually grouped.
  • This effect persisted across different grouping principles (motion, orientation, synchrony).

Conclusions:

  • Spatial organization demonstrably influences the articulation effect, impacting lightness perception.
  • Lightness computation appears to rely on mid-level visual representations where perceptual organization is established.
  • Findings align with and support the double-anchoring theory of lightness.