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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Strength and variability of the backscroll illusion.

Kiyoshi Fujimoto1, Akihiro Yagi, Takao Sato

  • 1Department of Psychology, School of Humanities, Kwansei Gakuin University, 1-1-155 Uegahara, Nishinomiya, Hyogo, 662-8501, Japan. kys.fujimoto@backscroll.jp

Vision Research
|February 25, 2009
PubMed
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The backscroll illusion, where a background appears to move oppositely to a walking person, was quantified. The illusion vanished when the background motion contrast aligned with the walker was twice that of the opposing motion.

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Area of Science:

  • Visual perception
  • Motion perception
  • Psychophysics

Background:

  • When observing a walking person in media, the background often appears to move in the opposite direction of the person's movement.
  • This phenomenon is known as the backscroll illusion.

Purpose of the Study:

  • To quantify the strength of the backscroll illusion.
  • To investigate interobserver and intraobserver variability in perceiving this illusion.

Main Methods:

  • Utilized movie clips featuring a walking person against a dynamic grating background.
  • Employed a motion-nulling psychophysical method, adjusting luminance contrast ratios of opposing gratings to eliminate perceived background motion.

Main Results:

  • The backscroll illusion was nullified when the luminance contrast of grating components moving with the walker was approximately double that of components moving against the walker.
  • Found relatively low intraobserver variability.
  • Observed greater variability in nulling points for individual observers with dynamic walkers compared to static walker images.

Conclusions:

  • The study quantifies the visual backscroll illusion, demonstrating a specific contrast ratio required to nullify the effect.
  • Highlights variability in perceptual judgments, particularly influenced by the dynamism of the walker stimulus.
  • Suggests underlying neural mechanisms related to motion perception and optic flow may explain the backscroll illusion.