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Publication AbstractsSpatial Reference and Standing Posture During High-Speed Coriolis StimulationKayoko Hitouji, Masahiro Takahashi, Masahiro Iida, Junichi Ohnuki, and Hiroyuki FuruyaAviat Space Environ Med 2002; 73:865-71 AbstractBackground: In a previous study, we found that sensation, gaze, and posture during Coriolis stimulation differ considerably between vision and nonvision conditions during rotations at 60° · s-1. To determine the validity of these findings at higher velocities, we compared standing postures during Coriolis stimulation up to 150° · s-1 between vision and nonvision conditions. Methods: The 19 subjects underwent 5-min rotation tests at 50 to 150° · s-1. While standing on a force platform attached to a rotating device, each subject tilted his or her head and then returned it to upright, first with the eyes covered, then with eyes open. Six subjects were re-examined 5 d later after 4 consecutive days of 20-min rotations with their eyes open. We assessed success and failure to stand and recorded the center of pressure during rotation. Results: Although success rates (number of successes/19) differed between vision and nonvision conditions at 50° · s-1 (94.7% vs. 57.9%), they steeply decreased as rotation velocity increased and showed no difference at 70° · s-1 and faster velocities. After the 4-d exposure, however, subjects could stand at higher velocities particularly under the vision condition. A patient with bilateral labyrinthine loss, being examined for reference, could stand at 110° · s-1 even with the eyes covered. Conclusions: Untrained subjects frequently fell during high-speed Coriolis stimulation, apparently because vision was insufficient to provide a spatial reference frame from the stationary surroundings. Following rotation training with their eyes open, subjects appeared more able to use the visual reference frame and falls were reduced.Keywords: Coriolis stimulation, posture control, spatial reference. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 73, Number 9 of the ASME journal.
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