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Gating by induced Α-Γ asynchrony in selective attention

Pascucci, David; Hervais-Adelman, Alexis; Plomp, Gijs (2018). Gating by induced Α-Γ asynchrony in selective attention. Human Brain Mapping, 39(10):3854-3870.

Abstract

Visual selective attention operates through top-down mechanisms of signal enhancement and suppression, mediated by α-band oscillations. The effects of such top-down signals on local processing in primary visual cortex (V1) remain poorly understood. In this work, we characterize the interplay between large-scale interactions and local activity changes in V1 that orchestrates selective attention, using Granger-causality and phase-amplitude coupling (PAC) analysis of EEG source signals. The task required participants to either attend to or ignore oriented gratings. Results from time-varying, directed connectivity analysis revealed frequency-specific effects of attentional selection: bottom-up γ-band influences from visual areas increased rapidly in response to attended stimuli while distributed top-down α-band influences originated from parietal cortex in response to ignored stimuli. Importantly, the results revealed a critical interplay between top-down parietal signals and α-γ PAC in visual areas. Parietal α-band influences disrupted the α-γ coupling in visual cortex, which in turn reduced the amount of γ-band outflow from visual areas. Our results are a first demonstration of how directed interactions affect cross-frequency coupling in downstream areas depending on task demands. These findings suggest that parietal cortex realizes selective attention by disrupting cross-frequency coupling at target regions, which prevents them from propagating task-irrelevant information.

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:06 Faculty of Arts > Institute of Psychology
Dewey Decimal Classification:150 Psychology
Scopus Subject Areas:Health Sciences > Anatomy
Health Sciences > Radiological and Ultrasound Technology
Health Sciences > Radiology, Nuclear Medicine and Imaging
Life Sciences > Neurology
Health Sciences > Neurology (clinical)
Language:English
Date:October 2018
Deposited On:20 Nov 2018 09:44
Last Modified:17 Feb 2025 02:47
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:1065-9471
OA Status:Hybrid
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1002/hbm.24216
Related URLs:https://www.biorxiv.org/content/early/2017/12/05/229526.full.pdf
PubMed ID:29797747
Other Identification Number:10.1101/229526
Project Information:
  • Funder: SNSF
  • Grant ID: PZ00P3_131731
  • Project Title: Functional brain networks: dynamics of directed information transfer in visual processes
  • Funder: SNSF
  • Grant ID: PP00P1_157420
  • Project Title: Dynamic Networks of Perception, Cognition and Action
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  • Content: Accepted Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)

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