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Related Experiment Videos

Prior depth information can bias motion perception.

Erich W Graf1, Wendy J Adams, Martin Lages

  • 1Department of Psychology, University of Southampton, Southampton, UK. erich@soton.ac.uk

Journal of Vision
|August 28, 2004
PubMed
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Prior visual scene information influences motion perception. Even without explicit depth cues, the brain uses learned depth ordering to resolve the motion aperture problem, biasing perceived motion direction.

Area of Science:

  • Visual Perception
  • Computational Neuroscience
  • Cognitive Psychology

Background:

  • The motion aperture problem describes how the brain perceives motion direction when an object is only visible through an aperture.
  • Previous research utilized binocular disparity to define aperture borders as intrinsic or extrinsic, influencing perceived motion.
  • The role of prior depth information, established before the main stimulus, remained unclear.

Purpose of the Study:

  • To investigate if prior depth ordering information from structure-from-motion can bias perceived motion direction in the motion aperture problem.
  • To determine if this bias is analogous to effects seen with binocular disparity cues.

Main Methods:

  • An aperture stimulus was presented, rotating to reveal intrinsic/extrinsic depth relationships of its borders.

Related Experiment Videos

  • A translating grating was then shown within the aperture, without explicit depth information.
  • Observers reported the perceived direction of the grating's motion.

    • Main Results:

    • Perceived motion direction was significantly shifted towards the direction of the occluding (extrinsic) edges.
    • Results align with predictions based on intrinsic-extrinsic border assignments.

    Conclusions:

    • Prior knowledge of scene depth ordering, established through structure-from-motion, influences motion perception.
    • The brain integrates pre-existing depth information to resolve the motion aperture problem, extending beyond cues present in the immediate stimulus.