Closely-Spaced, Fast Dynamic Movements in Disparity Vergence.
Tara L. Alvarez, John L. Semmlow, and Weihong Yuan.
Department of Biomedical Engineering, Rutgers University, Piscataway,
NJ 08855, U.S.A. Department of Surgery (Bioengineering), Robert Wood Johnson
Medical School- UMDNJ, New Brunswick, NJ 08901, U.S.A..
APStracts 4:258N, 1997.
ABSTRACT
Conflicting theories exist describing how symmetrical vergence responses, the
inward or outward turning of the eyes, are mediated. Classical theories
describe vergence control as mediated by visual feedback (Toates 1974;
Krishnan and Stark 1977). Extensive experimental evidence indicates that two
distinct control components comprise the vergence response (Jones 1980; Jones
and Stephens 1989; Hung et al. 1986; Semmlow et al. 1986) and a recent theory
supports the concept that one of these components is not visually-guided.
Occasionally, saccadic eye movements will respond to a single step stimulus
with two closely-space saccades, a behavior that is indicative of its
switching control structure. If a portion of the vergence response is
controlled in a manner analogous to saccades then occasional double fast
dynamic components might be expected.
Received 21 May 1997; accepted in final form 16 September 1997.
APS Manuscript Number J427-7.
Article publication pending J. Neurophysiol.
ISSN 1080-4757 Copyright 1997 The American Physiological Society.
Published in APStracts on 7 October 1997