Cross-coupling between horizontal and vertical eye movements during optokinetic nystagmus and optokinetic afternystagmus elicited in microgravity.

Abstract:

:The occurrence of horizontal jerks with larger amplitudes than on Earth was observed during vertical optokinetic nystagmus in astronauts tested throughout a 7-day spaceflight. During early exposure to microgravity, a horizontal spontaneous-like nystagmus was recorded in darkness following both vertical and horizontal optokinetic stimulation. In addition, the time constant of vertical OKAN with slow phase up was larger than on the ground. These effects disappeared on flight day 2. Then, the horizontal and vertical OKAN time constants decreased, and gradually returned to the preflight values, as previously observed with the gain of the vestibulo-ocular reflex. The early changes in microgravity are in agreement with those obtained on Earth in monkeys and humans during static tilt relative to gravity. Our findings suggest that the absence of otolithic input in microgravity may have an effect on the optokinetic system which could be mediated by the velocity storage mechanism.

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Clement G,Berthoz A

doi

10.3109/00016489009107432

subject

Has Abstract

pub_date

1990-03-01 00:00:00

pages

179-87

issue

3-4

eissn

0001-6489

issn

1651-2251

journal_volume

109

pub_type

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