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Eye movements cannot explain vibration-induced visual motion and motion aftereffect.

Tatjana Seizova-Cajic1, W L Ben Sachtler, Ian S Curthoys

  • 1Department of Psychology, The University of Sydney, Brennan Building A18, Sydney, NSW 2006, Australia. tanjas@psych.usyd.edu.au

Experimental Brain Research
|March 24, 2006
PubMed
Summary

This study found that eye movements do not cause visual motion illusions experienced during neck vibration. Instead, a global spatial constancy mechanism, considering head movement, is responsible for these perceptions.

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Area of Science:

  • Neuroscience
  • Vision Science
  • Perception

Background:

  • Visual motion illusions are often attributed to eye movements.
  • Two main eye movement accounts include retinal slip and nystagmus suppression.

Purpose of the Study:

  • To investigate the role of eye movements in visual motion illusions and aftereffects induced by neck vibration.
  • To test the retinal slip and nystagmus-suppression explanations for these illusions.

Main Methods:

  • Neck muscles were vibrated in participants (N=10) while eye movements and perceived illusory motion of a light target in darkness were recorded.
  • The direction of slow eye movements and suppressed slow-phase eye movements were compared to the direction of illusory motion.

Main Results:

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  • Neither actual nor suppressed eye movements correlated with the direction of the illusory visual motion.
  • Eye movement direction did not reverse when the illusory motion reversed after vibration ceased.
  • Significant individual differences in eye movements were observed despite consistent illusory experiences.

Conclusions:

  • Eye movements are not the cause of visual motion illusions or aftereffects from neck vibration.
  • A global spatial constancy mechanism, incorporating head movement, likely underlies these illusions.
  • The findings challenge the idea of a single central signal governing both perception and oculomotor behavior.