Fast gaze reorientations by combined movements of the eye, head, trunk and lower extremities

Experimental Brain Research
D AnastasopoulosA M Bronstein

Abstract

Large reorientations of the line of sight, involving combined rotations of the eyes, head, trunk and lower extremities, are executed either as fast single-step or as slow multiple-step gaze transfers. In order to obtain more insight into the mechanisms of gaze and multisegmental movement control, we have investigated time-optimal gaze shifts (i.e. with the instruction to move as fast as possible) during voluntary whole-body rotations to remembered targets up to 180° eccentricity performed by standing healthy humans in darkness. Fast, accurate, single-step movement patterns occurred in approximately 70 % of trials, i.e. considerably more frequently than in previous studies with the instruction to turn at freely chosen speed (30 %). Head-in-space velocity in these cases was significantly higher than during multiple-step transfers and displayed a conspicuously regular bell-shaped profile, increasing smoothly to a peak and then decreasing slowly until realignment with the target. Head-in-space acceleration was on average not different during reorientations to the different target eccentricities. In contrast, head-in-space velocity increased with target eccentricity due to the longer duration of the acceleration phase implemented du...Continue Reading

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Citations

Jul 19, 2018·Journal of Neurophysiology·Alexander StamenkovicMark A Hollands
Sep 19, 2019·Experimental Brain Research·Hirotake YamazoeYasushi Yagi
Sep 5, 2019·Journal of Neurophysiology·Dimitri AnastasopoulosAdolfo M Bronstein

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