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Effects of spaceflight on ocular counterrolling and the spatial orientation of the vestibular system

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Abstract

We recorded the horizontal (yaw), vertical (pitch), and torsional (roll) eye movements of two rhesus monkeys with scierai search coils before and after the COSMOS Biosatellite 2229 Flight. The aim was to determine effects of adaptation to microgravity on the vestibulo-ocular reflex (VOR). The animals flew for 11 days. The first postflight tests were 22 h and 55 h after landing, and testing extended for 11 days after reentry. There were four significant effects of spaceflight on functions related to spatial orientation: (1) Compensatory ocular counterrolling (OCR) was reduced by about 70% for static and dynamic head tilts with regard to gravity. The reduction in OCR persisted in the two animals throughout postflight testing. (2) The gain of the torsional component of the angular VOR (roll VOR) was decreased by 15% and 50% in the two animals over the same period. (3) An up-down asymmetry of nystagmus, present in the two monkeys before flight was reduced after exposure to microgravity. (4) The spatial orientation of velocity storage was shifted in the one monkey that could be tested soon after flight. Before flight, the yaw axis eigenvector of optokinetic afternystagmus was close to gravity when the animal was upright or tilted. After flight, the yaw orientation vector was shifted toward the body yaw axis. By 7 days after recovery, it had reverted to a gravitational orientation. We postulate that spaceflight causes changes in the vestibular system which reflect adaptation of spatial orientation from a gravitational to a body frame of reference. These changes are likely to play a role in the postural, locomotor, and gaze instability demonstrated on reentry after spaceflight.

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Authors and Affiliations

  1. Department of Neurology, Mount Sinai School of Medicine, 1 East 100th Street, Box 1135, 10029, New York, NY, USA

    Mingjia Dai, Leigh McGarvie & Bernard Cohen

  2. Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, USA

    Bernard Cohen

  3. Institute of Biomedical Problems, Moscow, Russia

    Inessa Kozlovskaya

  4. Department of Computer and Information Science, Brooklyn College, CUNY, USA

    Theodore Raphan

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  1. Mingjia Dai
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  2. Leigh McGarvie
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  3. Inessa Kozlovskaya
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  4. Theodore Raphan
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  5. Bernard Cohen
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Dai, M., McGarvie, L., Kozlovskaya, I. et al. Effects of spaceflight on ocular counterrolling and the spatial orientation of the vestibular system. Exp Brain Res 102, 45–56 (1994). https://doi.org/10.1007/BF00232437

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  • DOI: https://doi.org/10.1007/BF00232437

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