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Related Experiment Videos

Radial motion looks faster

P J Bex1, W Makous

  • 1Center for Visual Science, University of Rochester, NY 14627-0268, USA. bex@cvs.rochester.edu

Vision Research
|January 13, 1998
PubMed
Summary
This summary is machine-generated.

Motion perception models may be too simple. Radial motion appears faster than translational motion, suggesting current models based on local motion signals are insufficient.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Cognitive psychology

Background:

  • Current models of motion perception rely on unidirectional motion-sensitive mechanisms.
  • These mechanisms provide local inputs for complex pattern motion like optic flow.

Purpose of the Study:

  • To test the generality of existing motion perception models.
  • To investigate discrepancies in perceived speed between radial and translational motion.

Main Methods:

  • Observers compared the perceived speed of radial gratings against translational vertical gratings.
  • Controlled for all visual parameters except motion pattern.

Main Results:

  • Radial gratings were consistently overestimated in speed by 20-60% compared to translational gratings.

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  • This speed bias was independent of general spatial/temporal processing or high relative speeds at the center.
  • Bias increased non-linearly with the exposed size of radial pattern sectors.

    • Conclusions:

    • Apparent speed cannot be explained solely by local motion signals, challenging current models.
    • The overestimation of radial motion speed may relate to perceived motion in depth.