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Dependence of the Torsional Vestibulo-Ocular Reflex on the Direction of Gravity
Center for Sensorimotor Research, Department of Neurology, Ludwig-Maximilian-University, Munich, Germany
Address for correspondence: Klaus Bartl, Center for Sensorimotor Research, Department of Neurology, Ludwig-Maximilian-University, Marchioninistr. 23, D-81377 Munich, Germany. Voice: +49-89-7095-4804; fax: +49-89-7095-4805. kbartl{at}nefo.med.uni-muenchen.de
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.
Key Words: vestibulo-ocular reflex • torsion • gravity • canals • otoliths • eye movement • estimation model This article has been cited by other articles:
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