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OCULAR TORSION ON EARTH AND IN WEIGHTLESSNESS *
Author(s) -
Young Laurence R.,
Lichtenberg Byron K.,
Arrott Anthony P.,
Crites Troy A.,
Oman Charles M.,
Edelman Elazer R.
Publication year - 1981
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1981.tb30862.x
Subject(s) - linear acceleration , weightlessness , acceleration , torsion (gastropod) , physics , geodesy , optics , acoustics , aerospace engineering , geology , classical mechanics , engineering , medicine , anatomy , astronomy
Ocular torsion (OT) was measured in human subjects during horizontal linear acceleration on a sled in the laboratory and when emerging from weightlessness during parabolic flights in NASA's KC-135 aircraft. Analysis of the frequency response of OT to sinusoidal horizontal oscillation on earth shows results consistent with constant tilt rate studies and with earlier models based on perception of acceleration. Step responses of OT to lateral acceleration are compared to similar profiles from aircraft tests with no preexisting gravitoinertial force on the otoliths. The sensitivity of OT to rotating wide fields producing vection and to tactile cues is compared for earth and weightlessness. A new instrument for high bandwidth video measurement of OT using a soft-contact-lens target is described.