Influence of body roll on visually induced sensations of self-tilt and rotation
article
We investigated whether illusory self-tilt and self-motion induced by rotation of a visual scene about the subject's roll-axis was enhanced by actual rotation of the subject during acceleration of the visual scene. Rotation of the subject to a tilt of 15° was with or without a delay between initial rotation (onset) and subsequent return to the vertical position (washout). In one set of conditions, visual motion and subject-motion were in opposite directions (concordant) and in another set they were in the same direction (discordant). For concordant motion the main effect of body rotation was to reduce the time taken by the subject to indicate self-tilt. The magnitude of perceived self-tilt consisted of the summed effects of actual body tilt and illusory body tilt induced by visual rotation. This effect did not persist after washout. The vection magnitude was not markedly influenced by body rotation. For discordant motion, subjects were confused and their responses were very variable, suggesting a non-linear visual-vestibular interaction.
Topics
TNO Identifier
9489
Source
Perception, 28(3), pp. 287-297.
Pages
287-297
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