Cited by 75EEG and Brain-Computer InterfacesFunctional Brain Connectivity StudiesNeural dynamics and brain function

Directed Functional Brain Connectivity Based on EEG Source Imaging: Methodology and Application to Temporal Lobe Epilepsy

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Coito, Ana, Michel, Christoph M., van Mierlo, Pieter, Vulliemoz, Serge, Plomp, Gijs·2016·IEEE Transactions on Biomedical Engineering

Abstract

OBJECTIVE: The importance of functional brain connectivity to study physiological and pathological brain activity has been widely recognized. Here, we aimed to 1) review a methodological pipeline to investigate directed functional connectivity between brain regions using source signals derived from high-density EEG; 2) elaborate on some methodological challenges; and 3) apply this pipeline to temporal lobe epilepsy (TLE) patients and healthy controls to investigate directed functional connectivity differences in the theta and beta frequency bands during EEG epochs without visible pathological activity. METHODS: The methodological pipeline includes: EEG acquisition and preprocessing, electrical-source imaging (ESI) using individual head models and distributed inverse solutions, parcellation of the gray matter in regions of interest, fixation of the dipole orientation for each region, computation of the spectral power in the source space, and directed functional connectivity estimation using Granger-causal modeling. We specifically analyzed how the signal-to-noise ratio (SNR) changes using different approaches for the dipole orientation fixation. We applied this pipeline to 20 left TLE patients, 20 right TLE patients, and 20 healthy controls. RESULTS: Projecting each dipole to the predominant dipole orientation leads to a threefold SNR increase as compared to the norm of the dipoles. By comparing connectivity in TLE versus controls, we found significant frequency-specific outflow differences in physiologically plausible regions. CONCLUSION: The results suggest that directed functional connectivity derived from ESI can help better understand frequency-specific resting-state network alterations underlying focal epilepsy. SIGNIFICANCE: EEG-based directed functional connectivity could contribute to the search of new biomarkers of this disorder.

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Crossref · 10.1109/tbme.2016.2619665

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  • In disease states, electrophysiological source imaging has revealed epileptic network characteristics in patients, even in the absence of epileptic activity.

    “In disease states, ESI has revealed epileptic network characteristics in patients (89, 90), even in the absence of epileptic activity.”

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Authors
Coito, A., Michel, C. M., van Mierlo, P., Vulliemoz, S., & Plomp, G.
Affiliations
  • University of Geneva (CH)
  • University of Fribourg (CH)
Venue
IEEE Transactions on Biomedical Engineering
Published
2016-12
Volume
63
Issue
12
Pages
2619-2628
ISSN
  • 0018-9294 (ISSN-L)
  • 1558-2531
OpenAlex
W2537775406
Cited by
75
References
64
Citations by year
2026: 2 · 2025: 8 · 2024: 6 · 2023: 2 · 2022: 5 · 2021: 7 · 2020: 14 · 2019: 13 · 2018: 12 · 2017: 4 · 2016: 1
FWCI
6.36
Type
journal article
Language
en
Open access
Locations
  • IEEE Transactions on Biomedical Engineering (publishedVersion)
  • PubMed (publishedVersion)
  • Ghent University Academic Bibliography (Ghent University) (acceptedVersion, other-oa)
Funders
  • Swiss National Science Foundation (141165, 140332)
  • SPUM Epilepsy (146633, PZ00P3_131731, PP00P1_157420/1, 320030-169198)
  • Foundation Gertrude von Meissner
  • Marie Sklodowska-Curie Fellowship (H2020-MSCA-IF-2014-660230)
  • Center for Biomedical Imaging of Geneva and Lausanne
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
Keywords
directed functional connectivity, temporal lobe epilepsy, EEG source localization, Granger causality, signal-to-noise ratio, theta band, beta band, resting-state networks, epilepsy biomarkers, high-density EEG, individual head model
MeSH terms
Brain, Electroencephalography, Epilepsy, Temporal Lobe, Humans, Nerve Net, Models, Statistical, Signal-To-Noise Ratio

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