Title
Ocular torsion before and after 1 hour centrifugation
Author
Groen, E.
de Graaf, B.
Bles, W.
Bos, J.E.
TNO Technische Menskunde
Publication year
1996
Abstract
To assess a possible otolith contribution to effects observed following prolonged expo-sure to hyper gravity, we used video-oculography to measure ocular torsion during static and dynamic conditions of lateral body tilt (roll) before and after one hour of centrifugation with a Gx-load of 3G. Static tilt (from 0 to 57 deg. to either side) showed a 10% decrease in otolith induced ocular torsion after centrifugation. This implies a reduced gain of the otolith function. The dynamic condition consisted of sinusoidal body roll (frequency 0.25 Hz, amplitude 45 deg.) about an earth horizontal and about an earth vertical axis (respectively, "with" and "without" otolith stimulation). Before centrifugation the gain of the slow component velocity (SCV) was significantly lower "with" otolith stimulation than "without" otolith stimulation. Apparently, the contribu-tion of the otoliths counteracts the ocular torsion response generated by the semicircular canals. Therefore, the observed increase in SCV gain in the condition "with" otolith stimulation after centrifugation, seems in correspondence with the decreased otolith gain in the static condition.
Subject
Perception
Adaptation
Hypergravity
Otoliths
Vestibulo-ocular reflex
adaptation
adult
centrifugation
conference paper
controlled study
eye movement
female
gravity
human
human experiment
male
normal human
oculography
otolith
priority journal
semicircular canal
torsion
vestibuloocular reflex
Adult
Centrifugation
Eye Movements
Female
Humans
Male
Otolithic Membrane
Torsion
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DOI
https://doi.org/10.1016/0361-9230(96)00125-6
TNO identifier
8610
Source
Brain Research Bulletin, 40 (5-6), 331-333
Document type
article