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Kinematic Principles of Primate Rotational Vestibulo-Ocular Reflex I. Spatial Organization of Fast Phase Velocity Axes

Summary: Kinematic Principles of Primate Rotational Vestibulo-Ocular Reflex
I. Spatial Organization of Fast Phase Velocity Axes
Department of Neurology, University Hospital Zu¨rich, CH-8091 Zurich, Switzerland; and Department of Surgery
(Otolaryngology), University of Mississippi Medical Center, Jackson, Mississippi 39216
Hess, Bernhard J. M. and Dora E. Angelaki. Kinematic princi- movement. This component is tightly controlled by vestibu-
ples of primate rotational vestibulo-ocular reflex. I. Spatial organi- lar signals (i.e., the semicircular canals), which thus deter-
zation of fast phase velocity axes. J. Neurophysiol. 78: 2193­ mine at least one of the three rotatory degrees of freedom
2202, 1997. The spatial organization of fast phase velocity vectors of fast phase rotation axes. What are the mechanisms that
of the vestibulo-ocular reflex (VOR) was studied in rhesus mon-
control the remaining degrees of freedom of fast eye move-keys during yaw rotations about an earth-horizontal axis that
ments and which are the underlying principles? Are fastchanged continuously the orientation of the head relative to gravity
phase axes randomly oriented around the axis of head(``barbecue spit'' rotation). In addition to a velocity component
rotation or do they comply to a particular organizationalparallel to the rotation axis, fast phases also exhibited a velocity
component that invariably was oriented along the momentary direc- principle?
tion of gravity. As the head rotated through supine and prone It has been thought traditionally that vestibular signals
positions, torsional components of fast phase velocity axes became control slow phase eye movements whereas fast phases of
prominent. Similarly, as the head rotated through left and right nystagmus and saccades are generated relatively indepen-
ear-down positions, fast phase velocity axes exhibited prominent
dently. Studies of the main sequence characteristics sup-vertical components. The larger the speed of head rotation the


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


Collections: Biology and Medicine