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Related Experiment Videos

Stereo sensitivity depends on stereo matching.

Suzanne P McKee1, Preeti Verghese, Bart Farell

  • 1Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. Suzanne@ski.org

Journal of Vision
|January 31, 2006
PubMed
Summary
This summary is machine-generated.

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Stereoacuity thresholds increase with target disparity, similar to bar targets. This suggests stereoacuity relies on stereo matching operations, not just disparity-encoding mechanisms.

Area of Science:

  • Vision science
  • Perceptual psychology

Background:

  • Stereoacuity thresholds typically increase with larger target disparities.
  • One hypothesis suggests coarser stereo mechanisms are engaged at greater disparities, leading to reduced sensitivity.

Purpose of the Study:

  • To investigate whether stereoacuity is limited by disparity-encoding mechanisms or stereo matching operations.
  • To test the hypothesis that coarser mechanisms explain rising stereoacuity thresholds.

Main Methods:

  • Stereoacuity was measured using 3 cycles per degree (cpd) gratings in a rectangular envelope.
  • Grating and edge disparities were parametrically varied from 0 to 20 arcmin.
  • Interocular phase was varied to isolate carrier disparity judgments, while edge disparity remained fixed.

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Main Results:

  • Stereoacuity thresholds rose monotonically with increasing edge disparity for gratings.
  • The pattern of threshold increase was similar to that observed with bar targets.
  • Thresholds did not oscillate with pedestal phase disparity as predicted by the coarse mechanism hypothesis.

Conclusions:

  • Stereoacuity is not solely determined by the sensitivity of disparity-encoding mechanisms.
  • The results support the view that stereoacuity is contingent on stereo matching operations that generate perceived depth.