Dynamics of binocular fixation of targets during fore-aft motion

Progress in Brain Research
Sergei B YakushinTheodore Raphan

Abstract

When subjects move in the fore-aft direction, version and vergence are generated through the linear vestibulo-ocular reflex (lVOR) and pursuit systems to maintain binocular fixation. While the dynamics of pursuit and the lVOR have been studied for monocular gaze, the frequencies over which these systems operate to maintain binocular fixation are not known. The frequency characteristics of pursuit and the lVOR and their interaction were determined in two monkeys that were trained to fixate targets at vertical, lateral, and oblique positions on a computer screen. Animals were oscillated at 0.05 Hz to 4 Hz along their naso-occipital axes while fixating the targets (lVOR+pursuit). Animals were also stationary and fixated targets on the screen moving horizontally, vertically, or obliquely over approximately 3 degrees at various frequencies up to 1 Hz (pursuit). Eye movements were recorded with dual scleral search coils, and Fick angles were computed for each eye and compared to target positions. When animals pursued targets moving on the screen at low frequencies (0.05 Hz-0.5 Hz), the gains were close to unity, and the eyes were in-phase with the target. Pursuit gains decreased to approximately 0.5 and phases lagged by approximately...Continue Reading

Citations

Sep 30, 2016·Journal of Neurophysiology·S B YakushinB Cohen
May 22, 2009·Experimental Brain Research·Mingjia DaiBernard Cohen

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