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'Coarse-to-fine' cyclopean processing.

A V Popple1, J M Findlay

  • 1Department of Psychology, University of Durham, UK. a.v.popple@dur.ac.uk

Perception
|January 1, 2000
PubMed
Summary
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Increasing the size of a depth pedestal in stereograms improves stereoacuity by engaging vergence. This effect, however, also shows contributions from other factors beyond vergence, especially in very brief stimuli.

Area of Science:

  • Visual perception
  • Stereopsis
  • Computational neuroscience

Background:

  • Previous research indicated vergence increases with cyclopean disc size.
  • A corresponding improvement in stereoacuity was predicted due to reduced fixation disparity.

Purpose of the Study:

  • To investigate the effect of spatial extent of a cyclopean depth pedestal on stereoacuity thresholds.
  • To differentiate the roles of vergence and cyclopean integration in this phenomenon.

Main Methods:

  • Utilized random-dot stereograms with a brief presentation (< or = 500 ms).
  • Observers judged the depth of a central disc relative to a surrounding pedestal disc.
  • Varied the size and disparity of the pedestal disc.

Main Results:

Related Experiment Videos

  • Stereoacuity thresholds significantly decreased with increasing pedestal disc size.
  • The size effect diminished when pedestal disparity was too small to elicit vergence.
  • A size effect persisted for stimuli too brief (< or = 100 ms) to permit vergence.

Conclusions:

  • The observed improvement in stereoacuity is largely attributable to vergence.
  • Cyclopean integration alone does not fully explain the size effect.
  • Non-vergence factors also contribute to the pedestal size effect on stereoacuity.