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The Journal of Neurophysiology Vol. 83 No. 6 June 2000, pp. 3264-3276
Copyright ©2000 by the American Physiological Society
Department of Neurology, University of Zurich, CH-8091 Zurich, Switzerland
Misslisch, Hubert and
Bernhard J. M. Hess.
Three-Dimensional Vestibuloocular Reflex of the Monkey: Optimal
Retinal Image Stabilization Versus Listing's Law. J. Neurophysiol. 83: 3264-3276, 2000. If the
rotational vestibuloocular reflex (VOR) were to achieve optimal retinal
image stabilization during head rotations in three-dimensional space,
it must turn the eye around the same axis as the head, with equal
velocity but in the opposite direction. This optimal VOR strategy
implies that the position of the eye in the orbit must not affect the
VOR. However, if the VOR were to follow Listing's law, then the
slow-phase eye rotation axis should tilt as a function of current eye
position. We trained animals to fixate visual targets placed straight
ahead or 20° up, down, left or right while being oscillated in yaw,
pitch, and roll at 0.5-4 Hz, either with or without a full-field
visual background. Our main result was that the visually assisted VOR of normal monkeys invariantly rotated the eye around the same axis as
the head during yaw, pitch, and roll (optimal VOR). In the absence of a
visual background, eccentric eye positions evoked small axis tilts of
slow phases in normal animals. Under the same visual condition, a
prominent effect of eye position was found during roll but not during
pitch or yaw in animals with low torsional and vertical gains following
plugging of the vertical semicircular canals. This result was in
accordance with a model incorporating a specific compromise between an
optimal VOR and a VOR that perfectly obeys Listing's law. We conclude
that the visually assisted VOR of the normal monkey optimally
stabilizes foveal as well as peripheral retinal images. The finding of
optimal VOR performance challenges a dominant role of plant mechanics
and supports the notion of noncommutative operations in the oculomotor
control system.
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