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The effect of interocular phase difference on perceived contrast.

Daniel H Baker1, Stuart A Wallis, Mark A Georgeson

  • 1School of Life and Health Sciences, Aston University, Birmingham, United Kingdom. d.h.baker1@aston.ac.uk

Plos One
|April 10, 2012
PubMed
Summary

Binocular contrast perception depends on image phase. Perceived contrast decreases with phase offset at low levels, but shows complex, non-monotonic changes at higher contrasts, challenging phase-invariant models.

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Area of Science:

  • Vision science
  • Perceptual psychology

Background:

  • Binocular vision involves fusing similar images and suppressing dissimilar ones (e.g., binocular rivalry).
  • Interocular suppression is phase-insensitive, while binocular summation requires in-phase stimuli.

Purpose of the Study:

  • To investigate how interocular phase offsets affect the perception of binocular contrast.
  • To challenge existing models of contrast perception and propose a new framework.

Main Methods:

  • A matching paradigm was used to measure perceived contrast.
  • Stimuli with varying interocular phase offsets (0-180°) and contrasts (2-32%) were presented.

Main Results:

  • At low contrasts, perceived contrast decreased with increasing phase offset.
  • At higher contrasts, perceived contrast was veridical for in-phase/antiphase stimuli but increased at intermediate phase angles.
  • Results contradicted phase-invariant models and supported a binocular contrast gain control model.

Conclusions:

  • Binocular contrast perception is complex and phase-dependent.
  • A novel binocular contrast gain control model, incorporating monocular gain controls and interocular suppression, accurately predicts the observed results.
  • This unified model explains both fusion and suppression within a single framework, even with vertical disparity.