Closely spaced, fast dynamic movements in disparity vergence

Journal of Neurophysiology
Tara L AlvarezW Yuan

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. Extensive experimental evidence indicates that two distinct control components comprise the vergence response, 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 spaced 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. During this study, eye movements were recorded in response to symmetrical vergence stimuli of 2, 4, 6, 8, and 10 degrees steps. The left and right eye movements were subtracted to yield a net vergence response, and only convergent responses were investigated. Double fast dynamic components associated with high-velocity movements were observed in all four subjects studied. In double high-velocity component responses, the average peak velocity of both fast dynamic movements was always considerably less...Continue Reading

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Citations

Jul 29, 2016·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Mitchell M ScheimanTara L Alvarez
Feb 16, 2016·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Nick FogtDavid L Rogers
Jul 22, 2018·Journal of Vision·Chang YaramothuTara L Alvarez
Feb 2, 2006·Annals of Biomedical Engineering·Verica Radisavljevic-Gajic
Mar 5, 2019·Journal of Neurotrauma·Chang YaramothuTara L Alvarez
May 28, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Chang YaramothuTara L Alvarez

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