Accession Number : AD0639405

Title :   LACK OF RESPONSE TO THERMAL STIMULATION OF THE SEMICIRCULAR CANALS IN THE WEIGHTLESSNESS PHASE OF PARABOLIC FLIGHT.

Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA

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

Report Date : 09 AUG 1966

Pagination or Media Count : 14

Abstract : The objective of this study was to clarify the mechanism of caloric nystagmus in man by conducting the test in weightlessness. Eight subjects were selected on the basis of a strong nystagmus response to irrigation with ice water. Nystagmus was determined by oscillograph tracings and direct observation, and in addition, subjective responses of the subject were obtained. The experimental evidence indicated that, under the conditions of this experiment, zero gravity completely suppressed caloric nystagmus. This supported Barany's original hypothesis that caloric nystagmus was dependent on difference in specific weight of the endolymph in the horizontal canal. (Author)

Descriptors :   (*WEIGHTLESSNESS, SEMICIRCULAR CANALS), (*NYSTAGMUS, WEIGHTLESSNESS), (*SEMICIRCULAR CANALS, THERMAL CONDUCTIVITY), BODY FLUIDS, STRESS(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE