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The effect of head turn velocity on Cross-coupled Stimulation during centrifugation

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dc.contributor.advisor Laurence R. Young. en_US Sheehan, Scott E. (Scott Eugene) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. en_US 2007-08-29T20:40:03Z 2007-08-29T20:40:03Z 2007 en_US
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2007. en_US
dc.description "February 2007." en_US
dc.description Includes bibliographical references (p. 88-93). en_US
dc.description.abstract Artificial Gravity (AG) has been suggested as a potential countermeasure to the deleterious physiologic effects of long-duration space flight. Short-radius centrifugation (SRC) provides a practical means of producing AG, though perceptual side-effects may potentially limit its operational feasibility. Head-turns in the rotating environment of SRC produce Cross-coupled Stimulation (CCS), which the subject perceives as a tumbling sensation. Acutely, the CCS tumbling sensation is nauseagenic, though adaptation has been shown to diminish this detriment over time. The force environment of CCS suggests that the head-turn velocity plays a role in determining the stimulus magnitude, though the degree to which has not been characterized. In order for SRC to be an operationally viable alternative for AG, it must be shown that the motion sickness symptoms can be controlled without sacrificing adaptation. Modulation of head turn velocity has been suggested as a means to that end. A total of 23 subjects were subjected to right quadrant head-turns of 8 different velocities while spinning at 19 and 23 RPMs in the rotating environment of SRC. en_US
dc.description.abstract (cont.) The perceptual effects were characterized with subjective and objective metrics, investigating the acute differences between velocities as well as the chronic effects on adaptation. The following key results were obtained: 1. A threshold of HT Velocity exists above which an asymptotic perceptual response is observed, and below which the resulting perceptual response diminishes at a logarithmically increasing rate. 2. The effects of HT Velocity are independent of HT direction, with differing head-turn directions produce contextually specific stimuli. 3. HT velocity modulation could provide a practical means of incremental adaptation. en_US
dc.description.statementofresponsibility by Scott E. Sheehan. en_US
dc.format.extent 178 p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.subject Aeronautics and Astronautics. en_US
dc.title The effect of head turn velocity on Cross-coupled Stimulation during centrifugation en_US
dc.type Thesis en_US S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. en_US
dc.identifier.oclc 163175548 en_US

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