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Variation of stereothreshold with random-dot stereogram density.

Liat Gantz1, Harold E Bedell

  • 1Gonda Multidisciplinary Brain Research Center, Bar Ilan University, Ramat Gan, Israel. liat.gantz@gmail.com

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|June 7, 2011
PubMed
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Stereoscopic thresholds for random-dot targets vary with density due to element spacing and crowding effects. Despite these differences, a single disparity-processing mechanism likely handles all tested random-dot stimuli.

Area of Science:

  • Vision Science
  • Perception

Background:

  • Stereoscopic thresholds can differ between contour and random-dot (RD) targets.
  • This may indicate distinct local vs. global processing mechanisms or stimulus property variations.

Purpose of the Study:

  • To investigate if stereothresholds from low- and high-density RD stimuli align with local and global disparity processing distinctions.
  • Evaluate the impact of RD stimulus density on stereoscopic perception.

Main Methods:

  • Measured stereothresholds in eight subjects using a line segment superimposed on RD surrounds.
  • Varied RD densities from 0.07% to 28.3%.

Main Results:

  • Stereothresholds were lowest (0.23 arc min) at 0.39% RD density.

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  • Thresholds approximately doubled at lower and higher densities.
  • Low-density increases are due to element spacing; high-density increases are due to crowding.

    • Conclusions:

    • Low- and high-density RD stimuli present different constraints, suggesting distinct target types.
    • However, similar thresholds across densities to local targets imply a single disparity-processing mechanism.