Accession Number : AD0690099

Title :   VESTIBULAR RESPONSES TO SINUSOIDAL ANGULAR ACCELERATION STIMULI WITH SUPERIMPOSED OFFSET VELOCITIES,

Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA

Personal Author(s) : Niven,Jorma I. ; Hixson,W. Carroll

Report Date : 02 APR 1969

Pagination or Media Count : 17

Abstract : Thirty subjects were exposed to a sinusoidal rotation stimulus of 0.025 cps and a peak velocity of 63 deg/sec, which was superimposed on a constant rotational velocity of 153 deg/sec clockwise (CW), 153 deg/sec counterclockwise (CCW), or 0 deg/sec. The phase lag of nystagmus and sensation directional transitions was determined and used to derive a functional index, 2zeta/omega sub n, equivalent to the Pi/delta index obtained by conventional cupulometry. Nystagmus-based values were found to be independent of the base velocity and its direction. The phase lag of the CCW-to-CW transition in sensation of turning increased with a CCW offset velocity and decreased with a CW offset. The opposite effect was observed for a CW-to-CCW transition. (Author)

Descriptors :   (*NYSTAGMUS, VESTIBULAR APPARATUS), (*VESTIBULAR APPARATUS, ROTATION), SEMICIRCULAR CANALS, STIMULATION(PHYSIOLOGY), PERCEPTION, STRESS(PHYSIOLOGY), ACCELERATION, SENSES(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE