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Related Experiment Videos

Visual mislocalisation induced by translational and radial background motion.

H Honda1

  • 1Department of Psychology, Niigata University, Japan. psychonda@cc.niigata-u.ac.jp

Perception
|October 2, 2001
PubMed
Summary

Transient background motion can create a visual illusion, causing observers to mislocalize stationary lights. This effect, observed with both striped and circular patterns, shifts perceived positions toward the center.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Neuroscience

Background:

  • Visual localization is crucial for interacting with the environment.
  • Background motion can influence the perceived location of objects.
  • Previous research has not fully explored the impact of transient motion direction.

Purpose of the Study:

  • To investigate how translational and radial background motion affects visual localization.
  • To determine if the direction of motion relative to the visual field influences mislocalization.
  • To understand the conditions under which a visual illusion of mislocalization occurs.

Main Methods:

  • Three experiments using different background patterns (vertical stripes, concentric circles).
  • Subjects indicated the apparent position of a flashed light spot.

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  • Backgrounds underwent rapid translational or radial motion before or after the spot flash.

    • Main Results:

    • A flashed spot was mislocalized towards the central fixation point when presented before background motion.
    • Mislocalization was more pronounced when background motion was opposite to the visual half-field of the spot.
    • Contracting radial motion and motion in the lower visual field also induced mislocalization.

    Conclusions:

    • Transient background motion can induce a visual illusion of mislocalization.
    • The direction of background motion relative to the visual field and fixation point is critical.
    • This illusion appears to be a specific response to motion directed towards the central visual field.