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RAPID COMMUNICATION Oculomotor Control of Primary Eye Position Discriminates Between

Oculomotor Control of Primary Eye Position Discriminates Between
Translation and Tilt
Department of Neurology, University Hospital Zu¨rich, CH-8091, Switzerland; and Department of Surgery
(Otolaryngology), University of Mississippi Medical Center, Jackson, Mississippi 38677
Hess, Bernhard J. M. and Dora E. Angelaki. Oculomotor control tion of Listing's plane is the state of ocular vergence (Mok
of primary eye position discriminates between translation and tilt. et al. 1992).
J. Neurophysiol. 81: 394­398, 1999. We have previously shown When the head dynamically rotates in space, for example,
that fast phase axis orientation and primary eye position in rhesus during off-vertical axis rotations, it has been shown that
monkeys are dynamically controlled by otolith signals during head
vestibulo-ocular reflex (VOR) fast phase eye positions alsorotations that involve a reorientation of the head relative to gravity.
maintain a planar organization as do visually guided sac-Because of the inherent ambiguity associated with primary otolith
cades with the head stationary. In this case, however, thereafferent coding of linear accelerations during head translation and
is a robust and consistent gravity-dependent shift and/or tilttilts, a similar organization might also underlie the vestibulo-ocular
of fast phase displacement planes (and thus primary posi-reflex (VOR) during translation. The ability of the oculomotor
system to correctly distinguish translational accelerations from tion), yet through angles much greater than those observed
gravity in the dynamic control of primary eye position has been in static tilt positions (Hess and Angelaki 1997a,b). For
investigated here by comparing the eye movements elicited by example, during rotation of the head about its yaw axis
sinusoidal lateral and fore-aft oscillations (0.5 Hz { 40 cm, equiva- in a tilted position, torsional and vertical primary position


Source: Angelaki, Dora - Department of Anatomy and Neurobiology, Washington University in St. Louis


Collections: Biology and Medicine