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The Journal of Neurophysiology Vol. 83 No. 3 March 2000, pp. 1637-1647
Copyright ©2000 by the American Physiological Society
1Department of Surgery (Otolaryngology) and Anatomy, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505; and 2Department of Neurology, University Hospital Zürich, CH-8091 Zurich, Switzerland
Angelaki, Dora E.,
M. Quinn McHenry, and
Bernhard J. M. Hess.
Primate Translational Vestibuloocular Reflexes. I. High-Frequency
Dynamics and Three-Dimensional Properties During Lateral Motion. J. Neurophysiol. 83: 1637-1647, 2000. The dynamics and three-dimensional (3-D) properties of the
primate translational vestibuloocular reflex (trVOR) for high-frequency (4-12 Hz, ±0.3-0.4 g) lateral motion were investigated during near-target viewing at center and eccentric targets. Horizontal response gains increased with frequency and depended on target eccentricity. The larger the horizontal and vertical target
eccentricity, the steeper the dependence of horizontal response gain on
frequency. In addition to horizontal eye movements, robust torsional
response components also were present at all frequencies. During
center-target fixation, torsional response phase was opposite
(anticompensatory) to that expected for an "apparent" tilt
response. Instead torsional response components depended systematically
on vertical-target eccentricity, increasing in amplitude when looking
down and reversing phase when looking up. As a result the trVOR eye
velocity vector systematically tilted away from a purely horizontal
direction, through an angle that increased with vertical eccentricity
with a slope of ~0.7. This systematic dependence of torsional eye
velocity tilt on vertical eye position suggests that the trVOR might
follow the 3-D kinematic requirements that have been shown to govern visually guided eye movements and near-target fixation.
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