Disentangling presentation and processing times in the brain

Caplette, L., Ince, R. A.A. , Jerbi, K. and Gosselin, F. (2020) Disentangling presentation and processing times in the brain. NeuroImage, 218, 116994. (doi: 10.1016/j.neuroimage.2020.116994) (PMID:32474082)

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Visual object recognition seems to occur almost instantaneously. However, not only does it require hundreds of milliseconds of processing, but our eyes also typically fixate the object for hundreds of milliseconds. Consequently, information reaching our eyes at different moments is processed in the brain together. Moreover, information received at different moments during fixation is likely to be processed differently, notably because different features might be selectively attended at different moments. Here, we introduce a novel reverse correlation paradigm that allows us to uncover with millisecond precision the processing time course of specific information received on the retina at specific moments. Using faces as stimuli, we observed that processing at several electrodes and latencies was different depending on the moment at which information was received. Some of these variations were caused by a disruption occurring 160–200 ​ms after the face onset, suggesting a role of the N170 ERP component in gating information processing; others hinted at temporal compression and integration mechanisms. Importantly, the observed differences were not explained by simple adaptation or repetition priming, they were modulated by the task, and they were correlated with differences in behavior. These results suggest that top-down routines of information sampling are applied to the continuous visual input, even within a single eye fixation.

Item Type:Articles
Additional Information:The study was supported by a Discovery Grant (04777-2014) from NSERC to F. G. and by an Alexander-Graham-Bell Doctoral Scholarship from NSERC to L. C.
Glasgow Author(s) Enlighten ID:Ince, Dr Robin
Creator Roles:
Ince, R. A.A.Resources, Software, Validation, Writing – review and editing
Authors: Caplette, L., Ince, R. A.A., Jerbi, K., and Gosselin, F.
College/School:College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:NeuroImage
ISSN (Online):1095-9572
Published Online:29 May 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in NeuroImage 218:116994
Publisher Policy:Reproduced under a Creative Commons license

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