Sep 25, 2012

Influence of head orientation and viewpoint oscillation on linear vection

Journal of Vestibular Research : Equilibrium & Orientation
Pearl S GutermanJames E Zacher

Abstract

Sensory conflict theories predict that adding simulated viewpoint oscillation to self-motion displays should generate significant and sustained visual-vestibular conflict and reduce the likelihood of illusory self-motion (vection). However, research shows that viewpoint oscillation enhances vection in upright observers. This study examined whether the oscillation advantage for vection depends on head orientation with respect to gravity. Displays that simulated forward/backward self-motion with/without horizontal and vertical viewpoint oscillation were presented to observers in upright (seated and standing) and lying (supine, prone, and left side down) body postures. Viewpoint oscillation was found to enhance vection for all of the body postures tested. Vection also tended to be stronger in upright postures than in lying postures. Changing the orientation of the head with respect to gravity was expected to alter the degree/saliency of the sensory conflict, which may explain the overall posture-based differences in vection strength. However, this does not explain why the oscillation advantage for vection persisted for all postures. Thus, the current postural and oscillation based vection findings appear to be better explained by ...Continue Reading

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Mentioned in this Paper

Prone Position
Illusions, Visual
Optic Flow
Motion Perception
Posture brand of calcium phosphate, tribasic
Vestibular Diseases
Supine Position
Ambulation
Utricle Structure
Psychological Orientation

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