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Related Experiment Videos

Backscroll illusion in far peripheral vision.

Kiyoshi Fujimoto1, Akihiro Yagi

  • 1Department of Psychology, Kwansei Gakuin University, Nishinomiya, Hyogo, Japan. kys.fujimoto@kwansei.ac.jp

Journal of Vision
|August 10, 2007
PubMed
Summary
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The backscroll illusion, where background motion appears to move opposite to a walking person, occurs even in peripheral vision. This suggests the visual system uses high-level motion signals across the entire visual field.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Psychology

Background:

  • The backscroll illusion is the perceived motion in a movie's background when a locomotive object is present.
  • This illusion typically involves a perceived motion opposite to the object's actual movement.

Purpose of the Study:

  • To investigate if the backscroll illusion occurs in far peripheral visual fields.
  • To determine the extent of the visual field involved in this illusion.

Main Methods:

  • Psychological experiments using a walking person stimulus against a counterphase grating background.
  • Stimuli were presented at various retinal eccentricities (0-50 degrees) on a hemispheric screen.
  • Short stimulus durations (350 ms) prevented eye movements, with observers reporting perceived grating motion.

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Main Results:

  • The backscroll illusion was observed with high probability even at eccentricities beyond 30 degrees.
  • The perceived motion of the grating was consistently in the opposite direction of the walking person.
  • Walking action was recognizable from far peripheral stimulation.

Conclusions:

  • The backscroll illusion extends into the far peripheral visual field.
  • The visual system likely employs high-level, object-centered motion signals to interpret peripheral visual information.