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Vestibuloocular reflex of rhesus monkeys after spaceflightThe vestibuloocular reflex (VOR) of two rhesus monkeys was recorded before and after 14 days of spaceflight. The gain (eye velocity/head velocity) of the horizontal VOR, tested 15 and 18 h after landing, was approximately equal to preflight values. The dominant time constant of the animal tested 15 h after landing was equivalent to that before flight. During nystagmus induced by off-vertical axis rotation (OVAR), the latency, rising time constant, steady-state eye velocity, and phase of modulation in eye velocity and eye position with respect to head position were similar in both monkeys before and after flight. There were changes in the amplitude of modulation of horizontal eye velocity during steady-state OVAR and in the ability to discharge stored activity rapidly by tilting during postrotatory nystagmus (tilt dumping) after flight: OVAR modulations were larger, and tilt dumping was lost in the one animal tested on the day of landing and for several days thereafter. If the gain and time constant of the horizontal VOR exchange in microgravity, they must revert to normal soon after landing. The changes that were observed suggest that adaptation to microgravity had caused alterations in way that the central nervous system processes otolith input.
Document ID
19920068864
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cohen, Bernard
(NASA Ames Research Center Moffett Field, CA, United States)
Kozlovskaia, Inessa
(NASA Ames Research Center Moffett Field, CA, United States)
Raphan, Theodore
(NASA Ames Research Center Moffett Field, CA, United States)
Solomon, David
(NASA Ames Research Center Moffett Field, CA, United States)
Helwig, Denice
(NASA Ames Research Center Moffett Field, CA, United States)
Cohen, Nathaniel
(NASA Ames Research Center Moffett Field, CA, United States)
Sirota, Mikhail
(NASA Ames Research Center Moffett Field, CA, United States)
Iakushin, Sergei
(Mount Sinai School of Medicine, New York; Brooklyn College, NY; Institute of Biomedical Problems Moscow, Russia)
Date Acquired
August 15, 2013
Publication Date
August 1, 1992
Publication Information
Publication: Journal of Applied Physiology, Supplement
Volume: 73
Issue: 2 Au
ISSN: 8750-7587
Subject Category
Life Sciences (General)
Accession Number
92A51488
Funding Number(s)
CONTRACT_GRANT: NAG2-573
Distribution Limits
Public
Copyright
Other

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