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Analysis of nystagmus response to a pseudorandom velocity inputSpace motion sickness was not reported during the first Apollo missions; however, since Apollo 8 through the current Shuttle and Skylab missions, approximately 50% of the crewmembers have experienced instances of space motion sickness. Space motion sickness, renamed space adaptation syndrome, occurs primarily during the initial period of a mission until habilation takes place. One of NASA's efforts to resolve the space adaptation syndrome is to model the individual's vestibular response for basis knowledge and as a possible predictor of an individual's susceptibility to the disorder. This report describes a method to analyse the vestibular system when subjected to a pseudorandom angular velocity input. A sum of sinusoids (pseudorandom) input lends itself to analysis by linear frequency methods. Resultant horizontal ocular movements were digitized, filtered and transformed into the frequency domain. Programs were developed and evaluated to obtain the (1) auto spectra of input stimulus and resultant ocular resonse, (2) cross spectra, (3) the estimated vestibular-ocular system transfer function gain and phase, and (4) coherence function between stimulus and response functions.
Document ID
19860021954
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lessard, C. S.
(Texas A&M Univ. College Station, TX, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1986
Publication Information
Publication: NASA. Johnson Space Center NASA/American Soceity for Engineering Educt
Subject Category
Aerospace Medicine
Accession Number
86N31426
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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