Accession Number : AD0637584

Title :   THE INVERSION ILLUSION IN PARABOLIC FLIGHT: ITS PROBABLE DEPENDENCE ON OTOLITH FUNCTION.

Descriptive Note : Joint rept.

Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA

Personal Author(s) : Graybiel,Ashton ; kellogg,S.

Report Date : 20 JUL 1966

Pagination or Media Count : 17

Abstract : Observations were made on normal subjects and deaf persons with bilateral labyrinthine defects (L-D subjects) under three different conditions in parabolic flight: (1) free-floating, (2) restrained in a Fiberglas mold, and (3) 'standing' on the overhead during a motified parabola generating about -0.05 G unit. There were interindividual differences in the reactions among the normal but not among the L-D subjects. Some normal but none of the L-D subjects experienced a reversal of their personal orientation with regard to up-down under all three conditions. This 'reversal' was considered to have its genesis in the vestibular organs, probably the otolith apparatus. Our findings are in accord with Russian reports describing feelings of inversion among cosmonauts in orbital flight. Attention is called to the necessity of distinguishing between information furnished by touch-pressure, kinesthesis, and stereagnosis under ordinary conditions and agravic touch-pressure, agravic kinethesis, and agravic steragnosis. (Author)

Descriptors :   (*WEIGHTLESSNESS, *ILLUSIONS), PERCEPTION, VESTIBULAR APPARATUS, POSTURE(PHYSIOLOGY), PROPRIOCEPTION, DEAFNESS, EAR, VISION, HEARING, NYSTAGMUS, VISUAL SIGNALS, SPACE FLIGHT, ASTRONAUTS

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE