Accession Number:

ADA218086

Title:

Influence of Gravito-Inertial Force on Vestibular Nystagmus in Man (Invloed van hoge +Gz gravito-inertiaal kracht op de vestibulaire nystagmus bij de mens)

Descriptive Note:

Corporate Author:

INSTITUTE FOR PERCEPTION RVO-TNO SOESTERBERG (NETHERLANDS)

Personal Author(s):

Report Date:

1989-07-01

Pagination or Media Count:

28.0

Abstract:

The influence of high Gz gravito-inertial force - G load on the vestibular system in man has been investigated in a centrifuge with a freely swinging gondola. The vertical vestibular nystagmus induced by acceleration to 3G was analysed, and compared with reference measurements at 1G. Our results indicate that the effects of increased G load are expressed in a prolonged time constant of the upbeat nystagmus, and in a subject-dependent persisting component of this nystagmus. In an attempt to explain these findings, a current model on the generation of vestibular induced eye movements is extended Angular acceleration stimulates the semicircular canals, which in an existing model induce slow compensatory eye movements via a direct reflex path, as well as through an integrating network in the central vestibular nuclei. This model is extended with the G load as a stimulus function for the otoliths, which are influencing eye movements via a direct path, as well as through a modulating action on the central integrator. This influence of G load on the vestibular system could interfere with visual perception, and thereby play a role in inducing spatial disorientation. Netherlands.

Subject Categories:

  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE