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Related Experiment Videos

Motion in depth from interocular velocity differences revealed by differential motion aftereffect.

Julian Martin Fernandez1, Bart Farell

  • 1Institute for Sensory Research, Syracuse University, New York 13244-5290, USA. julian_fernandez@isr.syr.edu

Vision Research
|December 17, 2005
PubMed
Summary

Two binocular mechanisms detect motion in depth: disparity changes and interocular velocity differences. This study shows velocity differences alone can create motion in depth perception, occurring late in visual processing.

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Area of Science:

  • Visual Neuroscience
  • Perception Psychology

Background:

  • Two binocular mechanisms, disparity changes over time and interocular velocity differences, are proposed for motion in depth detection.
  • Previous research confirmed disparity changes elicit motion in depth perception, but the role of interocular velocity differences remains inconclusive.

Purpose of the Study:

  • To investigate whether interocular velocity differences can independently generate the perception of motion in depth.
  • To determine the stage of visual processing where motion aftereffects related to interocular velocity differences are generated.

Main Methods:

  • Utilized the motion aftereffect paradigm, inducing differential aftereffects (translational and rotational) to each eye.
  • Tested perception of motion in depth in a stationary random-dot pattern presented binocularly after adaptation.

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Main Results:

  • A rotational motion aftereffect significantly inhibited perceived motion in depth, despite real rotation inducing it.
  • A non-horizontal translational motion aftereffect did not inhibit motion in depth perception.
  • Differential translational motion aftereffects previously shown to strongly induce motion in depth.

Conclusions:

  • Pure interocular velocity differences are sufficient to generate motion in depth perception.
  • Illusory positional changes from motion aftereffects arise late in the visual processing hierarchy, after binocular combination.