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Doppler Optical Coherence Tomography of Retinal Circulation
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Expanding and contracting optic-flow patterns and vection.

Andrea Bubka1, Frederick Bonato, Stephen Palmisano

  • 1Department of Psychology, Saint Peter's College, Jersey City, NJ 07306, USA.

Perception
|July 9, 2008
PubMed
Summary

Contracting optic-flow patterns induce stronger visually induced self-motion perception (vection) than expanding patterns, potentially due to less sensory conflict. This finding impacts understanding simulator sickness (SS).

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Area of Science:

  • Visual perception
  • Human-computer interaction
  • Neuroscience

Background:

  • Optic-flow patterns can induce self-motion perception (vection) and simulator sickness (SS) in stationary observers.
  • Expanding flow patterns are hypothesized to cause more SS than contracting patterns due to heightened sensory conflict.

Purpose of the Study:

  • To investigate whether increased sensory conflict in expanding flow patterns inhibits vection.
  • To compare vection onset and magnitude between expanding and contracting optic-flow patterns.

Main Methods:

  • Participants (n=15) viewed expanding or contracting blue square patterns on a large screen.
  • Vection onset and magnitude were measured using a computer-interfaced slide device over 30 seconds.

Main Results:

  • Vection onset was significantly faster for contracting patterns.
  • Vection magnitude was significantly stronger for contracting patterns compared to expanding patterns.

Conclusions:

  • Contracting optic-flow patterns elicit stronger vection, contrary to expectations based on SS.
  • Neural expectancies from common forward self-motion (expanding flow) may reduce vection salience, while less common backward motion (contracting flow) generates less sensory conflict and stronger vection.