Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics

We performed an EEG graph analysis on data from 31 typical readers (22.27 ± 2.53 y/o) and 24 dyslexics (22.99 ± 2.29 y/o), recorded while they were engaged in an audiovisual task and during resting-state. The task simulates reading acquisition as participants learned new letter-sound mappings via fe...

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Autores principales:	Gorka Fraga-González, Dirk J. A. Smit, Melle J. W. Van der Molen, Jurgen Tijms, Cornelis J. Stam, Eco J. C. de Geus, Maurits W. Van der Molen
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	EEG networks dyslexia letter-speech sound associations phase lag index minimum spanning tree (MST) Psychology BF1-990
Acceso en línea:	https://doaj.org/article/deef6dae8f59460294a89ce641c76916
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spelling	oai:doaj.org-article:deef6dae8f59460294a89ce641c769162021-12-01T03:37:12ZGraph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics1664-107810.3389/fpsyg.2021.767839https://doaj.org/article/deef6dae8f59460294a89ce641c769162021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fpsyg.2021.767839/fullhttps://doaj.org/toc/1664-1078We performed an EEG graph analysis on data from 31 typical readers (22.27 ± 2.53 y/o) and 24 dyslexics (22.99 ± 2.29 y/o), recorded while they were engaged in an audiovisual task and during resting-state. The task simulates reading acquisition as participants learned new letter-sound mappings via feedback. EEG data was filtered for the delta (0.5–4 Hz), theta (4–8 Hz), alpha (8–13 Hz), and beta (13–30 Hz) bands. We computed the Phase Lag Index (PLI) to provide an estimate of the functional connectivity between all pairs of electrodes per band. Then, networks were constructed using a Minimum Spanning Tree (MST), a unique sub-graph connecting all nodes (electrodes) without loops, aimed at minimizing bias in between groups and conditions comparisons. Both groups showed a comparable accuracy increase during task blocks, indicating that they correctly learned the new associations. The EEG results revealed lower task-specific theta connectivity, and lower theta degree correlation over both rest and task recordings, indicating less network integration in dyslexics compared to typical readers. This pattern suggests a role of theta oscillations in dyslexia and may reflect differences in task engagement between the groups, although robust correlations between MST metrics and performance indices were lacking.Gorka Fraga-GonzálezGorka Fraga-GonzálezGorka Fraga-GonzálezDirk J. A. SmitDirk J. A. SmitMelle J. W. Van der MolenMelle J. W. Van der MolenJurgen TijmsJurgen TijmsJurgen TijmsCornelis J. StamEco J. C. de GeusEco J. C. de GeusMaurits W. Van der MolenMaurits W. Van der MolenFrontiers Media S.A.articleEEGnetworksdyslexialetter-speech sound associationsphase lag indexminimum spanning tree (MST)PsychologyBF1-990ENFrontiers in Psychology, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	EEG networks dyslexia letter-speech sound associations phase lag index minimum spanning tree (MST) Psychology BF1-990
spellingShingle	EEG networks dyslexia letter-speech sound associations phase lag index minimum spanning tree (MST) Psychology BF1-990 Gorka Fraga-González Gorka Fraga-González Gorka Fraga-González Dirk J. A. Smit Dirk J. A. Smit Melle J. W. Van der Molen Melle J. W. Van der Molen Jurgen Tijms Jurgen Tijms Jurgen Tijms Cornelis J. Stam Eco J. C. de Geus Eco J. C. de Geus Maurits W. Van der Molen Maurits W. Van der Molen Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics
description	We performed an EEG graph analysis on data from 31 typical readers (22.27 ± 2.53 y/o) and 24 dyslexics (22.99 ± 2.29 y/o), recorded while they were engaged in an audiovisual task and during resting-state. The task simulates reading acquisition as participants learned new letter-sound mappings via feedback. EEG data was filtered for the delta (0.5–4 Hz), theta (4–8 Hz), alpha (8–13 Hz), and beta (13–30 Hz) bands. We computed the Phase Lag Index (PLI) to provide an estimate of the functional connectivity between all pairs of electrodes per band. Then, networks were constructed using a Minimum Spanning Tree (MST), a unique sub-graph connecting all nodes (electrodes) without loops, aimed at minimizing bias in between groups and conditions comparisons. Both groups showed a comparable accuracy increase during task blocks, indicating that they correctly learned the new associations. The EEG results revealed lower task-specific theta connectivity, and lower theta degree correlation over both rest and task recordings, indicating less network integration in dyslexics compared to typical readers. This pattern suggests a role of theta oscillations in dyslexia and may reflect differences in task engagement between the groups, although robust correlations between MST metrics and performance indices were lacking.
format	article
author	Gorka Fraga-González Gorka Fraga-González Gorka Fraga-González Dirk J. A. Smit Dirk J. A. Smit Melle J. W. Van der Molen Melle J. W. Van der Molen Jurgen Tijms Jurgen Tijms Jurgen Tijms Cornelis J. Stam Eco J. C. de Geus Eco J. C. de Geus Maurits W. Van der Molen Maurits W. Van der Molen
author_facet	Gorka Fraga-González Gorka Fraga-González Gorka Fraga-González Dirk J. A. Smit Dirk J. A. Smit Melle J. W. Van der Molen Melle J. W. Van der Molen Jurgen Tijms Jurgen Tijms Jurgen Tijms Cornelis J. Stam Eco J. C. de Geus Eco J. C. de Geus Maurits W. Van der Molen Maurits W. Van der Molen
author_sort	Gorka Fraga-González
title	Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics
title_short	Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics
title_full	Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics
title_fullStr	Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics
title_full_unstemmed	Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics
title_sort	graph analysis of eeg functional connectivity networks during a letter-speech sound binding task in adult dyslexics
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/deef6dae8f59460294a89ce641c76916
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Graph Analysis of EEG Functional Connectivity Networks During a Letter-Speech Sound Binding Task in Adult Dyslexics

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