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Perception of the Upright and Susceptibility to Motion Sickness as Functions of Angle of Tilt and Angular Velocity in Off-Vertical RotationMotion sickness susceptibility of four normal subjects was measured in terms of duration of exposure necessary to evoke moderate malaise (MIIA) as a function of velocity in a chair rotated about a central axis tilted 10 deg with respect to gravitational upright. The subjects had little or no susceptibility to this type of rotation at 2.5 and 5.0 rpm, but with further increases in rate, the MIIA endpoint was always reached and with ever shorter test durations. Minimal provocative periods for all subjects were found at 15 or 20 rpm. Higher rotational rates dramatically reversed the vestibular stressor effect, and the subjects as a group tended to reach a plateau of relatively low susceptibility at 40 and 45 rpm. At these higher velocities, furthermore, the subjects essentially lost their sensation of being tilted off vertical. In the second half of the study, the effect of tilt angle was varied while the rotation rate was maintained at a constant 17.5 rpm. Two subjects were completely resistant to symptoms of motion sickness when rotated at 2.5 deg off vertical; with greater off-vertical angles, the susceptibility of all subjects increased sharply at first, then tapered off in a manner reflecting a Fechnerian function.
Document ID
19740010651
Document Type
Conference Paper
Authors
Earl F. Miller II
(Naval Aerospace Medical Research Laboratory Pensacola, Florida, United States)
Ashton Graybiel
(Naval Aerospace Medical Research Laboratory Pensacola, Florida, United States)
Date Acquired
August 7, 2013
Publication Date
August 19, 1970
Publication Information
Publication: Fifth Symposium on the Role of the Vestibular Organs in Space Exploration
Volume: NASA-SP-314
Subject Category
Biosciences
Meeting Information
Fifth Symposium on the Role of the Vestibular Organs in Space Exploration(Pensacola, FL)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19740010641Analytic PrimaryFifth Symposium on the Role of the Vestibular Organs in Space Exploration