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Related Experiment Videos

T-junctions in inhomogeneous surrounds.

T O Melfi1, J A Schirillo

  • 1Department of Psychology, Wake Forest University, 27109, Winston Salem, NC, USA.

Vision Research
|November 25, 2000
PubMed
Summary

Altering checkerboard patterns with T-junctions changes how test patches appear. These modifications enhance visual induction effects, making lighter areas seem darker and darker areas lighter, but asymmetry persists.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • Checkerboard surrounds create asymmetrical induction effects on test patches.
  • Lighter checks darken incremental patches more than darker checks lighten decremental patches.
  • Previous research established these asymmetrical induction effects (Schirillo & Shevell, 1996).

Purpose of the Study:

  • To investigate how manipulating checkerboard surrounds with T-junctions affects visual induction.
  • To determine if perceptual grouping via T-junctions alters asymmetrical induction.
  • To quantify changes in perceived lightness and darkness of test patches.

Main Methods:

  • Utilizing inhomogeneous checkerboard surrounds with modified spatial arrangements.
  • Introducing T-junctions to create perceptual grouping between checks and test patches.
  • Measuring changes in perceived lightness/darkness for incremental and decremental test patches.

Main Results:

  • Modified surrounds with T-junctions enhanced induction effects compared to original surrounds.
  • Increments appeared darker (approx. 8%) and decrements lighter (approx. 10-23%) in modified surrounds.
  • One modified surround, resembling White's illusion, showed a significant increase in lightness induction for decrements (approx. 23%).

Conclusions:

  • T-junctions in checkerboard surrounds can enhance visual induction effects.
  • Perceptual grouping through T-junctions modulates the inducing effects of surrounding checks.
  • Despite enhanced grouping, the fundamental asymmetrical induction effects remain dominant (Schirillo & Shevell, 1996).

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