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Related Experiment Videos

Occlusion and the solution to the aperture problem for motion.

S Shimojo1, G H Silverman, K Nakayama

  • 1Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115.

Vision Research
|January 1, 1989
PubMed
Summary

The aperture problem in motion perception is solved by edge terminators, but this effect is abolished by uncrossed stereoscopic disparity. Occluding edges, unlike intrinsic terminators, influence motion perception by signaling occlusion constraints.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Cognitive psychology

Background:

  • The aperture problem describes the ambiguity in perceiving motion direction from a single oriented contour.
  • Edge terminators, particularly along aperture boundaries, are thought to resolve this ambiguity, leading to perceived motion aligned with the aperture's longer axis (e.g., barber pole illusion).

Purpose of the Study:

  • To investigate the role of stereoscopic disparity and terminator type (intrinsic vs. extrinsic) in resolving the aperture problem.
  • To determine if the disambiguating effect of terminators can be manipulated or abolished using stereoscopic cues.

Main Methods:

  • Utilized a barber pole display with diagonal stripes within a rectangular aperture.
  • Manipulated the stereoscopic disparity of the striped pattern relative to the aperture.

Related Experiment Videos

  • Investigated motion perception in vertically aligned apertures separated by stereoscopically coded occluding segments.

    • Main Results:

    • The disambiguating effect of edge terminators was abolished when the striped pattern had uncrossed stereoscopic disparity relative to the aperture.
    • Motion in separate apertures, normally perceived as horizontal, was perceived as vertically linked when the separating segments appeared as occluders.

    Conclusions:

    • Stereoscopic disparity, specifically uncrossed disparity, can override the influence of edge terminators in solving the aperture problem.
    • Accidental (extrinsic) terminators created by occlusion are processed differently from intrinsic terminators, suggesting that occlusion constraints are integral to motion ambiguity resolution.