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Effect of Spaceflight on Vestibulo-Ocular Reflexes (VORS) During Angular Head MotionVestibulo-ocular reflexes (VORs) stabilize the eyes during head motion. During Earth-horizontal (E-H) pitch or roll rotations, canal and otolith stimuli occur together. In Earth-vertical (E-V) pitch or roll rotations, only canal signals occur. In cats and squirrel monkeys, pitch/roll VOR gains during E-H motion have been shown to be larger than during E-V motion, implying that otolith modulation plays a role in producing angular VORs (aVORs). The present experiments replicated this experiment in rhesus monkeys, and examined how spaceflight affected AVOR gain. During yaw, pitch and roll (0.5 - 1.0 Hz, 40-50 deg/s pk) motion, 3-d eye movements were recorded in four Rhesus monkeys using scleral search coils. Mean E-H and E-V pitch VOR gains were 0.85 and 0.71. Torsional VOR gains during E-H and E-V were 0.47 and 0.39. Gains are more compensatory during E-H pitch or roll. Two of the four monkeys flew for 11 days on the COSMOS 2229 Biosatellite. E-H pitch VOR gains were attenuated immediately (72 hrs) post-flight, with similar values to pre-flight E-V pitch gains. Horizontal yaw VOR gains were similar pre- and post-flight.
Document ID
20020039613
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Tomko, David L.
(NASA Ames Research Center Moffett Field, CA United States)
Clifford, James O.
(Lockheed Martin Engineering and Sciences Co. Moffett Field, CA United States)
Hargens, Alan R.
Date Acquired
August 20, 2013
Publication Date
January 1, 1996
Subject Category
Behavioral Sciences
Meeting Information
Meeting: 26th Annual Meeting of the Society for Neuroscience
Location: Washington, DC
Country: United States
Start Date: November 16, 1996
End Date: November 21, 1996
Sponsors: Society for Neuroscience
Funding Number(s)
PROJECT: RTOP 199-16-12-24
PROJECT: RTOP 106-30-04-40
PROJECT: RTOP 199-16-12-23
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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