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Summary: JOURNALOF NEUROPHYSIOLOGY
Vol. 75, No. 6, June 1996. Printed in U.S.A.
Three-Dimensional Organization of Otolith-Ocular Reflexes in Rhesus
Monkeys. II. Inertial Detection of Angular Velocity
DORA E. ANGELAKI AND BERNHARD J. M. HESS
Department of Surgery ( Otolaryngology ), University of Mississippi Medical Center, Jackson, Mississippi 392164.505;
and Department of Neurology, University Hospital Ztirich, CH-8091 Zurich, Switzerland
SUMMARY AND CONCLUSIONS
1. The dynamic contribution of otolith signals to three-dimen-
sional angular vestibuloocular reflex (VOR) was studied during
off-vertical axis rotations in rhesus monkeys. In an attempt to
separate response components to head velocity from those to head
position relative to gravity during low-frequency sinusoidal oscilla-
tions, large oscillation amplitudes were chosen such that peak-to-
peak head displacements exceeded 360'. Because the waveforms
of head position and velocity differed in shape and frequency con-
tent, the particular head position and angular velocity sensitivity
of otolith-ocular responses could be independently assessed.
2. During both constant velocity rotation and low-frequency
sinusoidal oscillations, the otolith system generated two different
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