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Vestibular Stimulation During A Simple Centrifuge Run
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Book Synopsis Vestibular Stimulation During a Simple Centrifuge Run by :
Download or read book Vestibular Stimulation During a Simple Centrifuge Run written by and published by . This book was released on 1990 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vestibular stimuli throughout a simple centrifuge run are described in this report, which is the first in a report series that is part of our basic research devoted to an Office of Naval Research accelerated research initiative on vestibular transduction. Herein, we compare stimuli throughout the initial angular acceleration with stimuli during the deceleration that ends the run. We provide tables that show differing rates of change of linear and angular acceleration vectors during the acceleration and deceleration, and we discuss the research steps needed to explain disorientation abhorence reactions and spatial orientation perceptions in centrifuge runs. Keywords: Vestibular transduction, Vestibular stimulus, Centrifuge, Semicircular canals, Otoliths. (js).
Book Synopsis Human Vestibular Response During 3 Gz̳ Centrifuge Stimulation by : Braden John McGrath
Download or read book Human Vestibular Response During 3 Gz̳ Centrifuge Stimulation written by Braden John McGrath and published by . This book was released on 1990 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The use of centrifuges in training aircrew to avoid GLOC is increasing. The purpose of this study was to record the vestibulo-ocular reflex (VOR) and subjective sensations to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of GLOC training centrifuges. Horizontal and vertical eye movements and post run sensations were recorded from 15 naive male human subjects seated head erect in a 20.5-ft radius pendulous chair centrifuge. Centrifuge profile was acceleration from 1 to 3 Gz in 19 s, 5 min of sustained 3 Gz, and deceleration to 1 Gz in 19 s. Tests were repeated up to three times with the subject facing the motion, and three times with the subject's back to the motion. Eye position was recorded in the dark using an ISCAN infrared video system. Six subjects experienced GLOC, and 1 withdrew due to unrelated sickness. Slow phase velocity (SPV) and sensations from the 8 subjects who completed all 6 runs were analyzed. Roll of the chair during acceleration and deceleration produced strong pitch, roll, and yaw sensations and eye movements attributable to vestibular Coriolis stimulation. Subjective pitch amplitude change was consistently greater during deceleration than acceleration, regardless of rotation direction. The SPV magnitude during the first run in a given direction was significantly different than the two subsequent runs. A sustained upbeating ('Lz') nystagmus (1-21 deg/ s, mean 8 deg/s at 100 s; 1-12 deg/s at 315 s) was observed in 7 of 8 subjects. VOR during centrifugation is composed of interacting transient angular and sustained linear VOR components. Sensation asymmetries are not observed in the VOR. Lz nystagmus magnitude is an individual subject characteristic. Centrifuge, Vestibulo-ocular, Lz nystagmus, Spatial Orientation ."--Stinet.
Book Synopsis Human Vestibular Response During 3 Gz Centrifuge Stimulation by : R. J. McGrath
Download or read book Human Vestibular Response During 3 Gz Centrifuge Stimulation written by R. J. McGrath and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of centrifuges in training aircrew to avoid GLOC is increasing. The purpose of this study was to record the vestibulo-ocular reflex (VOR) and subjective sensations to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of GLOC training centrifuges. Horizontal and vertical eye movements and post run sensations were recorded from 15 naive male human subjects seated head erect in a 20.5-ft radius pendulous chair centrifuge. Centrifuge profile was acceleration from 1 to 3 Gz in 19 s, 5 min of sustained 3 Gz, and deceleration to 1 Gz in 19 s. Tests were repeated up to three times with the subject facing the motion, and three times with the subject's back to the motion. Eye position was recorded in the dark using an ISCAN infrared video system. Six subjects experienced GLOC, and 1 withdrew due to unrelated sickness. Slow phase velocity (SPV) and sensations from the 8 subjects who completed all 6 runs were analyzed. Roll of the chair during acceleration and deceleration produced strong pitch, roll, and yaw sensations and eye movements attributable to vestibular Coriolis stimulation. Subjective pitch amplitude change was consistently greater during deceleration than acceleration, regardless of rotation direction. The SPV magnitude during the first run in a given direction was significantly different than the two subsequent runs. A sustained upbeating ('Lz') nystagmus (1-21 deg/ s, mean 8 deg/s at 100 s; 1-12 deg/s at 315 s) was observed in 7 of 8 subjects. VOR during centrifugation is composed of interacting transient angular and sustained linear VOR components. Sensation asymmetries are not observed in the VOR. Lz nystagmus magnitude is an individual subject characteristic. Centrifuge, Vestibulo-ocular, Lz nystagmus, Spatial Orientation.
Book Synopsis Human Vestibular Response During 3 Gz Centrifuge Stimulation by : R. J. McGrath
Download or read book Human Vestibular Response During 3 Gz Centrifuge Stimulation written by R. J. McGrath and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of centrifuges in training aircrew to avoid GLOC is increasing. The purpose of this study was to record the vestibulo-ocular reflex (VOR) and subjective sensations to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of GLOC training centrifuges. Horizontal and vertical eye movements and post run sensations were recorded from 15 naive male human subjects seated head erect in a 20.5-ft radius pendulous chair centrifuge. Centrifuge profile was acceleration from 1 to 3 Gz in 19 s, 5 min of sustained 3 Gz, and deceleration to 1 Gz in 19 s. Tests were repeated up to three times with the subject facing the motion, and three times with the subject's back to the motion. Eye position was recorded in the dark using an ISCAN infrared video system. Six subjects experienced GLOC, and 1 withdrew due to unrelated sickness. Slow phase velocity (SPV) and sensations from the 8 subjects who completed all 6 runs were analyzed. Roll of the chair during acceleration and deceleration produced strong pitch, roll, and yaw sensations and eye movements attributable to vestibular Coriolis stimulation. Subjective pitch amplitude change was consistently greater during deceleration than acceleration, regardless of rotation direction. The SPV magnitude during the first run in a given direction was significantly different than the two subsequent runs. A sustained upbeating ('Lz') nystagmus (1-21 deg/ s, mean 8 deg/s at 100 s; 1-12 deg/s at 315 s) was observed in 7 of 8 subjects. VOR during centrifugation is composed of interacting transient angular and sustained linear VOR components. Sensation asymmetries are not observed in the VOR. Lz nystagmus magnitude is an individual subject characteristic. Centrifuge, Vestibulo-ocular, Lz nystagmus, Spatial Orientation.
Book Synopsis Human Vestibulo-Ocular Response During 3-Gz Centrifuge Stimulation by :
Download or read book Human Vestibulo-Ocular Response During 3-Gz Centrifuge Stimulation written by and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vestibulo-ocular reflex (VOR) and spatial orientation perceptions were recorded in 15 subjects during a 3-Gz centrifuge run. These data were obtained to study two issues; first, to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of G-induced loss of consciousness (G-LOC) training centrifuges. Secondly, to study the effects of sustained vertical linear acceleration on the vestibular system. The centrifuge run consisted of an acceleration to 3-Gz in 19 s, sustained 3-Gz for 5 min, and a deceleration to 1 Gz in 19 s. The runs were repeated three times with the subject facing the motion, and three times with the subject's back to the motion. The VOR and spatial orientation perceptions from the eight subjects who completed all six runs were analyzed. The total VOR response during acceleration and deceleration of a centrifuge run is composed of interacting angular and linear VOR components. However, the VOR response did not correspond to reported asymmetries in pitch orientation perception between centrifuge acceleration and deceleration. During the constant velocity high G phase of a centrifuge run, a sustained up-beating ("Lz") nystagmus was observed in 14 of the 15 subjects. For the eight subjects analyzed, Lz nystagmus was shown to be an individual subject characteristic, and displayed a range of mean magnitudes from 0 to 10 deg/s at 90 s. Assuming a normal visual suppression ratio of the VOR, the magnitudes of the Lz nystagmus in our subject sample did not appear sufficient to degrade visual acuity.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Virtual Environments by : Kelly S. Hale
Download or read book Handbook of Virtual Environments written by Kelly S. Hale and published by CRC Press. This book was released on 2014-09-10 with total page 1371 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Complete Toolbox of Theories and TechniquesThe second edition of a bestseller, Handbook of Virtual Environments: Design, Implementation, and Applications presents systematic and extensive coverage of the primary areas of research and development within VE technology. It brings together a comprehensive set of contributed articles that address the
Book Synopsis Pamphlets on Mentallt Handicapped and Crime by :
Download or read book Pamphlets on Mentallt Handicapped and Crime written by and published by . This book was released on 1980* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Parametric Study of Vestibular Stimulation During Centrifugation by : Jeremie M. Pouly
Download or read book A Parametric Study of Vestibular Stimulation During Centrifugation written by Jeremie M. Pouly and published by . This book was released on 2006 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) There were four key findings: 1. All measures, except the slow-phase velocity (SPV) peak amplitude of the vestibulo-ocular reflex, decrease significantly between the two experimental days, which demonstrates that significant adaptation is achieved. 2. Large head-angles lead to longer vertical vestibulo-ocular reflex time-constants than smaller angles do, but do not lead to greater adaptation. 3. In the nose-up position, the perceived body-tilt is highly correlated with the true tilt of the gravito-inertial force at mid-chest level. 4. The SPV-peak amplitude and all subjective ratings except body-tilt show significant correlation with the intensity of the cross-coupled stimulus (CCS): the larger the CCS, the stronger the vestibular response.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vestibular System Part 2: Psychophysics, Applied Aspects and General Interpretations by : H.H. Kornhuber
Download or read book Vestibular System Part 2: Psychophysics, Applied Aspects and General Interpretations written by H.H. Kornhuber and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: The function of the vestibular system is not as obvious as those of vision, hearing, touch or smell. Vestibular dysfunction, however, is clearly apparent where lesions are present. It is probably for this reason that the vestibular sense was not discovered until the nineteenth century and that clinicians have continued to playa major role in basic vestibular research right up to the present. The relationship between basic and clinical research is certainly stronger in the vesti bular field than in that of tactile sensation, for instance, as testified by the work of clinicians as MENIERE, BREUER, BARANY, DEKLEIJN and FRENZEL. In this respect the situation is similar in vestibular physiology and in endocrinology, and for the same reason. This second part of the vestibular volume of the Handbook of Sensory Physio logy will be of interest to neurologists, otologists, neurosurgeons, ophthalmologists and physiotherapists on the one hand, and psychologists, physiologists, engineers and aviation specialists on the other. For a full understanding of Part 2, it is necessary to have assimilated the basic anatomy, physiology, and biochemistry of Part 1.
Download or read book Aerospace Medicine and Biology written by and published by . This book was released on 1991 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Book Synopsis Sensing and Controlling Motion by : Bernard Cohen
Download or read book Sensing and Controlling Motion written by Bernard Cohen and published by . This book was released on 1992 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of many of the issues that are currently of interest or importance to the vestibular and sensorimotor community, particularly as they relate to the perception and control of motion. Sections are included on vestibular transduction; studies of spatial orientation and three-dimensional organization; visual basis for the linear VOR and visual input to the VOR; perception of motion and position in hypergravity and hypogravity; neural processing and pathophysiology of the vestibular nuclei; stabilization of gaze and posture; and vestibular and cerebellar transmitters.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 : Total Pages :214 pages Book Rating :4.3/5 (91 download)
Book Synopsis AGARD Lecture Series by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book AGARD Lecture Series written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1991 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Habituation to Complex Vestibular Stimulation in Man: Transfer and Retention of Effects from Twelve Days of Rotation at 10 Rpm by : Fred E Guedry (Jr)
Download or read book Habituation to Complex Vestibular Stimulation in Man: Transfer and Retention of Effects from Twelve Days of Rotation at 10 Rpm written by Fred E Guedry (Jr) and published by . This book was released on 1965 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: In three experimental runs, a total of nine men rotated at 10 RPM for twelve days. Eight control subjects were tested at comparable intervals. Rotating chair tests conducted before and after the twelve-day run demonstrated that nystagmus and subjective effects produced by head movements during the accustomed direction of rotation (CCW) had diminished markedly. In the unaccustomed rotation direction (CW) one hour after room rotation, nystagmus and subjective reactions approximately equaled reactions which would facilitate reactions during the CW rotation and counteract reactions during CCW rotation. Two days after the twelve-day run, responses to both rotation directions were suppressed as compared with initial levels of response; compensatory reactions had apparently dissipated. Some response decline was still present three weeks after the twelve-day run, but tests after three months revealed considerable recovery toward initial response levels. Reactions to passive whole-body angular acceleration were not greatly altered by the twelveday run. (Author).
Book Synopsis Current List of Medical Literature by :
Download or read book Current List of Medical Literature written by and published by . This book was released on 1959 with total page 1036 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes section, "Recent book acquisitions" (varies: Recent United States publications) formerly published separately by the U.S. Army Medical Library.
Book Synopsis Annals of the New York Academy of Sciences by : Thomas Lincoln Casey
Download or read book Annals of the New York Academy of Sciences written by Thomas Lincoln Casey and published by . This book was released on 1975 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt: Records of meetings 1808-1916 in v. 11-27.
