Accession Number : AD0659192

Title :   ADAPTATION TO VESTIBULAR DISORIENTATION. VII. SPECIAL EFFECTS OF BRIEF PERIODS OF VISUAL FIXATION ON NYSTAGMUS AND SENSATIONS OF TURNING,

Corporate Author : CIVIL AEROMEDICAL INST OKLAHOMA CITY OKLA

Personal Author(s) : Collins,William E.

Report Date : MAY 1967

Pagination or Media Count : 21

Abstract : The influences of (a) disorientation experience and (b) brief periods of visual still-fixation were examined in exposing figure skaters and ordinary subjects to various rates of angular acceleration. Both nystagmic eye movements and sensations of turning were recorded. Skaters produced significantly less primary slow-phase eye displacement than did non-skaters, but the groups did not differ in number of eye movements nor in duration of nystagmus. Introduction of the visual still-fixation period significantly shortened primary nystagmus and produced an accentuated secondary nystagmus for both groups. The term 'habituation' (a 'dropping out' of responses), used to define the effects of repeated vestibular stimulation, does not appear to describe completely the active process of change evidenced in the nystagmic tracings presented in this and other studies. Durations of turning sensations were shorter for skaters than for non-skaters. For both groups the period of room illumination, allowing subjects actively to fixate on stationary visual objects, significantly shortened or abruptly terminated the subjective reaction. (Author)

Descriptors :   (*VESTIBULAR APPARATUS, ACCELERATION TOLERANCE), (*NYSTAGMUS, ACCELERATION), (*PERCEPTION, MOTION), VISION, HABITUATION LEARNING, STIMULATION(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE