PMID: 15224882Jul 1, 2004Paper

Effect of microgravity on spatial orientation and posture regulation during Coriolis stimulation

Acta Oto-laryngologica
Masahiro TakahashiHajime Takeoka

Abstract

To elucidate spatial orientation and posture regulation under conditions of microgravity. Coriolis stimulation was done with five normal subjects on the ground (1 g) and onboard an aircraft (under conditions of microgravity during parabolic flight). Subjects were asked to tilt their heads forward during rotation at speeds of 0, 50, 100 and 150 degrees/s on the ground and 100 degrees/s during flight. Body sway was recorded using a 3D linear accelerometer and eye movements using an infrared charge-coupled device video camera. Flight experiments were performed on 5 consecutive days, and 11-16 parabolic maneuvers were done during each flight. Two subjects boarded each flight and were examined alternately at least five times. Coriolis stimulation at 1 g caused body sway, nystagmus and a movement sensation in accordance with inertial inputs at 1 g. Neither body sway, excepting a minute sway due to the Coriolis force, nor a movement sensation occurred in microgravity, but nystagmus was recorded. Posture, eye movement and sensation at 1 g are controlled with reference to spatial coordinates that represent the external world in the brain. Normal spatial coordinates are not relevant in microgravity because there is no Z-axis, and the pos...Continue Reading

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Oct 31, 1998·Brain Research. Brain Research Reviews·M F ReschkeV McDonald
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Citations

Aug 11, 2005·Chiropractic & Osteopathy·Mark W MorningstarTrevor V Ireland

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