Time course of spatiotopic updating across saccades

Fabius, J. H., Fracasso, A. , Nijboer, T. C.W. and Van der Stigchel, S. (2019) Time course of spatiotopic updating across saccades. Proceedings of the National Academy of Sciences of the United States of America, (doi:10.1073/pnas.1812210116) (PMID:30655348) (Early Online Publication)

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Abstract

Humans move their eyes several times per second, yet we perceive the outside world as continuous despite the sudden disruptions created by each eye movement. To date, the mechanism that the brain employs to achieve visual continuity across eye movements remains unclear. While it has been proposed that the oculomotor system quickly updates and informs the visual system about the upcoming eye movement, behavioral studies investigating the time course of this updating suggest the involvement of a slow mechanism, estimated to take more than 500 ms to operate effectively. This is a surprisingly slow estimate, because both the visual system and the oculomotor system process information faster. If spatiotopic updating is indeed this slow, it cannot contribute to perceptual continuity, because it is outside the temporal regime of typical oculomotor behavior. Here, we argue that the behavioral paradigms that have been used previously are suboptimal to measure the speed of spatiotopic updating. In this study, we used a fast gaze-contingent paradigm, using high phi as a continuous stimulus across eye movements. We observed fast spatiotopic updating within 150 ms after stimulus onset. The results suggest the involvement of a fast updating mechanism that predictively influences visual perception after an eye movement. The temporal characteristics of this mechanism are compatible with the rate at which saccadic eye movements are typically observed in natural viewing.

Item Type:Articles
Additional Information:This work was supported by The Netherlands Organization for Scientific Research Vidi Grant 452-13-008 (to S.V.d.S.)
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fracasso, Dr Alessio
Authors: Fabius, J. H., Fracasso, A., Nijboer, T. C.W., and Van der Stigchel, S.
College/School:College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:Proceedings of the National Academy of Sciences of the United States of America
Publisher:National Academy of Sciences
ISSN:0027-8424
ISSN (Online):1091-6490
Published Online:17 January 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Proceedings of the National Academy of Sciences of the United States of America 2019
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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