Rapid Vestibular Adaptation in a Rotating Environment by Means of Controlled Head Movements PDF Download
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Author: Ashton Graybiel Publisher: ISBN: Category : Motion sickness Languages : en Pages : 24
Book Description
Two attempts to telescope, in time, vestibular adaptation in a slow rotation room (SRR) were made to determine the easiest and quickest means of preventing the appearance of SRR sickness at a terminal velocity of 10 rpm. Three subjects in each experiment were exposed to unit increases in rotational velocity at which time they made several hundred experimenter-directed head movements. Prior to cessation of rotation standardized tasks were performed to determine the degree of transfer of adaptation acquired from the 'directed' movements. The results demonstrate that the process of homeostatic adaptation can be greatly speeded up through experimental control of head movements although a large number of 'limited' head motions must be made to ensure transfer of adaptation to general activities. Some idea was gained regarding the number and excursion of head movements required at each unit increase in rpm for adaptation and overadaptation at terminal velocity. (Author).
Author: Ashton Graybiel Publisher: ISBN: Category : Motion sickness Languages : en Pages : 24
Book Description
Two attempts to telescope, in time, vestibular adaptation in a slow rotation room (SRR) were made to determine the easiest and quickest means of preventing the appearance of SRR sickness at a terminal velocity of 10 rpm. Three subjects in each experiment were exposed to unit increases in rotational velocity at which time they made several hundred experimenter-directed head movements. Prior to cessation of rotation standardized tasks were performed to determine the degree of transfer of adaptation acquired from the 'directed' movements. The results demonstrate that the process of homeostatic adaptation can be greatly speeded up through experimental control of head movements although a large number of 'limited' head motions must be made to ensure transfer of adaptation to general activities. Some idea was gained regarding the number and excursion of head movements required at each unit increase in rpm for adaptation and overadaptation at terminal velocity. (Author).
Author: Ashton Graybiel Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
Two attempts to telescope, in time, vestibular adaptation in a slow rotation room (SRR) were made to determine the easiest and quickest means of preventing the appearance of SRR sickness at a terminal velocity of 10 rpm. Three subjects in each experiment were exposed to unit increases in rotational velocity at which time they made several hundred experimenter-directed head movements. Prior to cessation of rotation standardized tasks were performed to determine the degree of transfer of adaptation acquired from the 'directed' movements. The results demonstrate that the process of homeostatic adaptation can be greatly speeded up through experimental control of head movements although a large number of 'limited' head motions must be made to ensure transfer of adaptation to general activities. Some idea was gained regarding the number and excursion of head movements required at each unit increase in rpm for adaptation and overadaptation at terminal velocity. (Author).
Author: James T. Reason Publisher: ISBN: Category : Coriolis force Languages : en Pages : 20
Book Description
The problem was to obtain a quantitative estimate of the degree of adaptation acquired as the result of different amounts of Coriolis stimulation. Subjects executed a predetermined number of controlled 90 deg. head motions at 5 rpm in the slow rotation room. Three measures of adaptation were used: (1) the number of perrotatory head movements evoking sensations due to the Coriolis acceleration, (2) the direction and duration of the Coriolis oculogyral illusion both during and immediately after the period of rotation, and (3) the number of postrotatory sensations producing some detectable after-sensation. The first measure was included to provide an indication of individual differences in adaptability; the remaining two were designed to reveal treatment effects. Six conditions of exposure, ranging from 30 to 180 sequences of eight motions each, produced no measurable differences in the degree of adaptation acquired. A positive and significant correlation was obtained between the number of perrotatory motions evoking a Coriolis reaction (irrespective of the total number of sequences executed) and the number of postrotatory motions producing an after-sensation. In a second experiment, the range of exposures was limited to 5, 10, 15, 20, and 25 sequences. Only the shortest exposure produced a measure of adaptation that was significantly less than that in the other conditions. (Author).
Author: James T. Reason Publisher: ISBN: Category : Acceleration (Physiology) Languages : en Pages : 24
Book Description
The purpose of this experiment was to answer specific questions relating to the design of an adaptation schedule effective in protecting against motion sickness in a rotating environment. Ten men with normal vestibular function executed controlled head and body movements at each of ten 1-rpm step increase in the velocity of the Pensacola Slow Rotation Room. On the completion of every moment, subjects were required to indicate whether or not they had detected sensations of vestibular or somatosensory origin. At each velocity step, the movements were continued until each of 24 consecutive movements had elicited a negative response and the subject was judged to be symptom free. When this arbitrary adaptation criterion was reached, the angular velocity was increased by 1 rpm and the procedure repeated. On attaining the criterion at the terminal velocity (10 rpm), the rotation was stopped and the postrotatory phenomena were investigated using the same techniques. The principal finding was that the number of movements necessary to achieve the adaptation criterion was systematically related to the absolute level of angular velocity. Considerably more head and body movements were required to reach the same level of adaptation at faster speeds than at slower speeds, even though the size of the step increment remained constant. There was some evidence to indicate that the amount of stimulation to criterion depended upon the initial magnitude of sensation elicited by the increment. There were also wide individual differences in both the rate of adaptation and the minimum velocity necessary to evoke sensation. (Author).
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 970
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: James T. Reason Publisher: ISBN: Category : Languages : en Pages : 21
Book Description
The purpose of this experiment was to answer specific questions relating to the design of an adaptation schedule effective in protecting against motion sickness in a rotating environment. Ten men with normal vestibular function executed controlled head and body movements at each of ten 1-rpm step increase in the velocity of the Pensacola Slow Rotation Room. On the completion of every moment, subjects were required to indicate whether or not they had detected sensations of vestibular or somatosensory origin. At each velocity step, the movements were continued until each of 24 consecutive movements had elicited a negative response and the subject was judged to be symptom free. When this arbitrary adaptation criterion was reached, the angular velocity was increased by 1 rpm and the procedure repeated. On attaining the criterion at the terminal velocity (10 rpm), the rotation was stopped and the postrotatory phenomena were investigated using the same techniques. The principal finding was that the number of movements necessary to achieve the adaptation criterion was systematically related to the absolute level of angular velocity. Considerably more head and body movements were required to reach the same level of adaptation at faster speeds than at slower speeds, even though the size of the step increment remained constant. There was some evidence to indicate that the amount of stimulation to criterion depended upon the initial magnitude of sensation elicited by the increment. There were also wide individual differences in both the rate of adaptation and the minimum velocity necessary to evoke sensation. (Author).
Author: Susan Herdman Publisher: F. A. Davis Company ISBN: Category : Medical Languages : en Pages : 424
Book Description
A text providing a thorough introduction to vestibular disorders for rehabilitation students and a comprehensive resource for clinicians treating patients with vestibular dysfunction. Chapters on vestibular anatomy and physiology, vestibular adaptation, and the role of the vestibular system in postural control provide the basis for understanding how the normal vestibular system functions. The main concern, however, is the assessment of patients with vestibular disorders and the development of different treatments. Annotation copyright by Book News, Inc., Portland, OR
Author: Ashton Graybiel
Author: Ashton Graybiel
Author: Ashton Graybiel
Author: James T. Reason
Author: James T. Reason
Author: 
Author: Ashton Graybiel
Author: James T. Reason
Author: Susan Herdman
Author: William Edward Collins
Author: