Saccadic compensation for smooth eye and head movements during head-unrestrained two-dimensional tracking

Journal of Neurophysiology
P M DayeP Lefèvre

Abstract

Spatial updating is the ability to keep track of the position of world-fixed objects while we move. In the case of vision, this phenomenon is called spatial constancy and has been studied in head-restraint conditions. During head-restrained smooth pursuit, it has been shown that the saccadic system has access to extraretinal information from the pursuit system to update the objects' position in the surrounding environment. However, during head-unrestrained smooth pursuit, the saccadic system needs to keep track of three different motor commands: the ocular smooth pursuit command, the vestibuloocular reflex (VOR), and the head movement command. The question then arises whether saccades compensate for these movements. To address this question, we briefly presented a target during sinusoidal head-unrestrained smooth pursuit in darkness. Subjects were instructed to look at the flash as soon as they saw it. We observed that subjects were able to orient their gaze to the memorized (and spatially updated) position of the flashed target generally using one to three successive saccades. Similar to the behavior in the head-restrained condition, we found that the longer the gaze saccade latency, the better the compensation for intervening...Continue Reading

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Citations

May 23, 2013·Journal of Translational Medicine·Pierre M DayePierre Pouget
Apr 5, 2011·Annual Review of Neuroscience·J Douglas CrawfordW Pieter Medendorp
Sep 26, 2013·Cerebral Cortex·Kalpana DokkaDora E Angelaki
Dec 29, 2020·Journal of Neurophysiology·Jonathan D CoutinhoGunnar Blohm

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