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Dependence of the torsional vestibulo-ocular reflex on the direction of gravity
Klaus Bartl1, Erich Schneider, Stefan Glasauer
1Center for Sensorimotor Research, Department of Neurology, Ludwig-Maximilian-University, Marchioninistr. 23, D-81377 Munich, Germany. kbartl@nefo.med.uni-muenchen.de
Abstract:
The torsional vestibulo-ocular reflex (tVOR), which is mainly driven by input from the semicircular canals, has been shown to be augmented by otolith input: its gain is increased in the upright as compared to the supine head orientation. We tested whether otolith input in right/left ear down and upside-down orientation also contributes to the tVOR. In contrast to current models of canal-otolith interaction, which predict equal responses in upright and upside-down orientations, we found that the tVOR in the upside-down position is significantly decreased, possibly due to an additive interaction of canal and otolith signals.
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