TY  - JOUR
PY  - 1999//
TI  - Postural adjustment response to depth direction moving patterns produced by virtual reality graphics
JO  - Japanese journal of physiology
A1  - Kuno, S.
A1  - Kawakita, T.
A1  - Kawakami, O.
A1  - Miyake, Y.
A1  - Watanabe, Shoko
SP  - 417
EP  - 424
VL  - 49
IS  - 5
N2  - 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>
LA  - en
SN  - 0021-521X
UR  - http://dx.doi.org/
ID  - ref1
ER  -