Dynamics of fixational eye position and microsaccades during spatial cueing: the case of express microsaccades

Journal of Neurophysiology
Xiaoguang TianZiad M Hafed

Abstract

Microsaccades are systematically modulated by peripheral spatial cues, and these eye movements have been implicated in perceptual and motor performance changes in cueing tasks. However, an additional oculomotor factor that may also influence performance in these tasks, fixational eye position itself, has been largely neglected so far. Using precise eye tracking and real-time retinal-image stabilization, we carefully analyzed fixational eye position dynamics and related them to microsaccade generation during spatial cueing. As expected, during baseline fixation, microsaccades corrected for a foveal motor error away from the preferred retinal locus of fixation (the so-called ocular position "set point" of the oculomotor system). However, we found that this relationship was violated during a short period immediately after cue onset; a subset of cue-directed "express microsaccades" that were highly precise in time and direction, and that were larger than regular microsaccades, occurred. These movements, having <100-ms latencies from cue onset, were triggered when fixational eye position was already at the oculomotor set point when the cue appeared; they were thus error-increasing rather than error-decreasing. Critically, even when ...Continue Reading

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Citations

Dec 13, 2018·Journal of Neurophysiology·Julianne SkinnerZiad M Hafed
Sep 12, 2019·Frontiers in Behavioral Neuroscience·Nico A FliermanAleksandra Badura
Aug 20, 2019·Nature Communications·Konstantin F WillekeZiad M Hafed
Sep 19, 2019·Journal of Neurophysiology·Jeremy B BadlerStephen J Heinen
Aug 8, 2020·ELife·Tatiana MalevichZiad M Hafed
Dec 3, 2020·Communications Biology·Lisa SchwetlickRalf Engbert
Feb 4, 2021·Journal of Neurophysiology·Ziad M HafedTong Zhang
Jul 4, 2021·Experimental Brain Research·Antimo BuonocoreRobert D McIntosh

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