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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Egocentric and allocentric localization during induced motion.

Robert B Post1, Robert B Welch, David Whitney

  • 1Department of Psychology, University of California, Davis, CA 95616, USA. rbpost@ucdavis.edu

Experimental Brain Research
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

Induced motion (IM) causes a dissociation between where we think we are pointing (egocentric) and where things actually are (allocentric). This study shows egocentric and allocentric locations differ under IM. Motor and perceptual measures revealed this spatial perception difference.

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Area of Science:

  • Visual perception
  • Spatial cognition
  • Human psychophysics

Background:

  • Induced motion (IM) is a visual illusion where a stationary object appears to move due to the motion of its surroundings.
  • Previous research suggests IM can influence spatial judgments, but the dissociation between egocentric (self-referenced) and allocentric (environment-referenced) spatial representations remains unclear.
  • Understanding this dissociation is crucial for comprehending how the brain integrates motion cues to construct spatial awareness.

Purpose of the Study:

  • To investigate whether induced motion (IM) causes a dissociation between egocentric and allocentric spatial location measures.
  • To differentiate the effects of IM on motor responses (egocentric) versus perceptual judgments (allocentric).
  • To determine if the Roelofs effect contributes to the observed dissociations.

Main Methods:

  • Experiments involved presenting a stationary target with an oscillating surround stimulus to induce motion.
  • Motor responses (open-loop pointing) were used to measure apparent egocentric location.
  • Perceptual judgments (Vernier alignment) were used to measure apparent allocentric location.
  • Stationary and oscillating surrounds were manipulated across different experimental conditions.

Main Results:

  • Induced motion (IM) led to egocentric pointing responses being displaced in the direction of perceived motion.
  • Allocentric Vernier judgments showed no perceptual displacement of the target relative to flashed stimuli.
  • This dissociation between egocentric and allocentric measures was observed under specific IM conditions, but not with stationary surrounds.

Conclusions:

  • Induced motion (IM) creates a dissociation between egocentric and allocentric spatial representations.
  • Motor-based egocentric localization is susceptible to IM, while perceptual allocentric localization is more robust.
  • The findings suggest distinct neural mechanisms underlie egocentric and allocentric spatial processing, particularly in response to motion stimuli.