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Three-Dimensional Ocular Kinematics During Eccentric Rotations: Evidence for Functional Rather Than Mechanical Constraints
 

Summary: Three-Dimensional Ocular Kinematics During Eccentric Rotations:
Evidence for Functional Rather Than Mechanical Constraints
Dora E. Angelaki
Department of Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
Submitted 18 December 2002; accepted in final form 14 January 2003
Angelaki, Dora E. Three-dimensional ocular kinematics during eccen-
tric rotations: evidence for functional rather than mechanical constraints.
J Neurophysiol 89: 26852696, 2003; 10.1152/jn.01137.2002. Previous
studies have reported that the translational vestibuloocular reflex
(TVOR) follows a three-dimensional (3D) kinematic behavior that is
more similar to visually guided eye movements, like pursuit, rather
than the rotational VOR (RVOR). Accordingly, TVOR rotation axes
tilted with eye position toward an eye-fixed reference frame rather
than staying relatively fixed in the head like in the RVOR. This
difference arises because, contrary to the RVOR where peripheral
image stability is functionally important, the TVOR like pursuit and
saccades cares to stabilize images on the fovea. During most natural
head and body movements, both VORs are simultaneously activated.
In the present study, we have investigated in rhesus monkeys the 3D
kinematics of the combined VOR during yaw rotation about eccentric

  

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

 

Collections: Biology and Medicine