@article{ref1,
title="Postural adjustment response to depth direction moving patterns produced by virtual reality graphics",
journal="Japanese journal of physiology",
year="1999",
author="Kuno, S. and Kawakita, T. and Kawakami, O. and Miyake, Y. and Watanabe, Shoko",
volume="49",
number="5",
pages="417-424",
abstract="PURPOSE: Human posture is controlled by a combination of vestibular, somatosensory and visual information. This paper is concerned with postural readjustment responses induced by vection. In the visual control of posture, visually-induced perception of self-motion plays an important role and is called vection. Vection is difficult to measure quantitatively because it is a highly subjective phenomenon. HYPOTHESIS: An optokinetic stimulus that moves in depth induces vection. We hypothesize that the magnitude of the visually-induced body sway is correlated with the degree of vection. METHODS: A depth optokinetic stimulus (DOKS) was projected onto a head-mounted display (HMD) worn by standing subjects. The DOKS consisted of a random dot pattern that was perceived three-dimensionally and moved in depth sinusoidally. Vection was estimated in two ways, a verbal assessment and a joystick maneuver. In addition, visually-induced body sway was measured by monitoring five reference points on the body by two video-motion analyzers. RESULTS: The magnitude of the subjective vection was highly correlated with visually-induced body sway and was strongly dependent on the velocity of the visual stimulus. The ankle joint was pivoted during visually-induced body sway and acted as a motion initiator. When the magnitude of body sway was large, the body movement was adjusted at the hip and head-neck joints. CONCLUSIONS: The high correlation between vection and body sway suggests that vection can be estimated quantitatively by measuring visually-induced body sway.<p /><p>Language: en</p>",
language="en",
issn="0021-521X",
doi="",
url="http://dx.doi.org/"
}