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Vestibular Contributions to Gaze Stability During Transient Forward and Backward Motion

Summary: Vestibular Contributions to Gaze Stability During Transient Forward and
Backward Motion
Bernhard J. M. Hess and Dora E. Angelaki
Department of Neurology, University Hospital Zurich, CH-8091 Zurich, Switzerland; and Department of Neurobiology,
Washington University School of Medicine, St. Louis, Missouri 63130
Submitted 28 March 2003; accepted in final form 13 May 2003
Hess, Bernhard J. M. and Dora E. Angelaki. Vestibular contribu-
tions to gaze stability during transient forward and backward motion.
May 28, 2003J Neurophysiol 90: 19962004, 2003. First published
May 28, 2003; 10.1152/jn.00302.2003. The accuracy with which the
vestibular system anticipates and compensates for the visual conse-
quences of translation during forward and backward movements was
investigated with transient motion profiles in rhesus monkeys trained
to fixate targets on an isovergence screen. Early during motion when
visuomotor reflexes remain relatively ineffective and vestibular-
driven mechanisms have an important role for controlling the move-
ment of the eyes, a large asymmetry was observed for forward and
backward heading directions. During forward motion, ocular velocity
gains increased steeply and reached near unity gains as early as 4050
ms after motion onset. In addition, instantaneous directional errors


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


Collections: Biology and Medicine