Current studies using a linear accelerator in Japan. Eye Movements Induced by Linear Acceleration in Humans.

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  • Mori Shigeo
    Space Medicine Research Center, Research Institute of Environmental Medicine, Nagoya University
  • Katayama Naomi
    Space Medicine Research Center, Research Institute of Environmental Medicine, Nagoya University

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  • わが国における直線加速度負荷装置利用の研究紹介　　直線加速度負荷で誘発されるヒトの眼球運動
  • 直線加速度負荷で誘発されるヒトの眼球運動
  • チョクセン カソクド フカ デ ユウハツ サレル ヒト ノ ガンキュウ ウンドウ

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Abstract

The otolith-function study is remarkably behind the semicanal-function study. In the present paper, we introduced briefly our on-going studies on eye movements including nystagmic elicitation during lateral (Gy) linear acceleration with step and sinusoidal modes using a sled-type accelerator. The eye movements were recorded by EOGs (DC) from subjects who looked at an imaginary target of their straight ahead in darkness during G-loading up to 0.5 G. Corresponding to the +Gy and -Gy segments, nystagmus and⁄or deviation in eye position were frequently induced in some subjects, but none or slightly in the other. The nystagmus changed the beating direction dependently on the Gy direction, while the eye-deviation could be either direction of compensatory or anticompensatory. In half of subjects, nystagmus elicitation was absent or low at 0.3 G, while it tended to increase above 0.3 G. The nystagmic elicitation was similar to each other between the both modes of acceleration, and directional preponderance (DP) was observed in some subjects. There was no correlation between the DP and the nystagmic slow-phase velocity. Functional meanings of these findings were discussed.

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