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Sensorimotor recovery following spaceflight may be due to frequent square-wave saccadic intrusionsSquare-wave jerks (SWJs) are small, involuntary saccades that disrupt steady fixation. We report the case of an astronaut (approximately 140 d on orbit) who showed frequent SWJs, especially postflight, but who showed no impairment of vision or decrement of postflight performance. These data support the view that SWJs do not impair vision because they are paired movements, consisting of a small saccade away from the fixation position followed, within 200 ms, by a corrective saccade that brings the eye back on target. Since many returning astronauts show a decrement of dynamic visual function during postflight locomotion, it seems possible that frequent SWJs improved this astronaut's visual function by providing postsaccadic enhancement of visual fixation, which aided postflight performance. Certainly, frequent SWJs did not impair performance in this astronaut, who had no other neurological disorder.
Document ID
20050150959
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Reschke, Millard
(NASA Johnson Space Center Houston, TX United States)
Somers, Jeffrey T.
Leigh, R. John
Krnavek, Jody M.
Kornilova, Ludmila
Kozlovskaya, Inessa
Bloomberg, Jacob J.
Paloski, William H.
Date Acquired
August 23, 2013
Publication Date
August 1, 2004
Publication Information
Publication: Aviation, space, and environmental medicine
Volume: 75
Issue: 8
ISSN: 0095-6562
Subject Category
Aerospace Medicine
Funding Number(s)
CONTRACT_GRANT: EY06717
Distribution Limits
Public
Copyright
Other
Keywords
Case Reports

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