Skip to main content
Top
Published in: Brain Topography 5/2018

Open Access 01-09-2018 | Original Paper

A Time-Varying Connectivity Analysis from Distributed EEG Sources: A Simulation Study

Authors: Eshwar G. Ghumare, Maarten Schrooten, Rik Vandenberghe, Patrick Dupont

Published in: Brain Topography | Issue 5/2018

Login to get access

Abstract

Time-varying connectivity analysis based on sources reconstructed using inverse modeling of electroencephalographic (EEG) data is important to understand the dynamic behaviour of the brain. We simulated cortical data from a visual spatial attention network with a time-varying connectivity structure, and then simulated the propagation to the scalp to obtain EEG data. Distributed EEG source modeling using sLORETA was applied. We compared different dipole (representing a source) selection strategies based on their time series in a region of interest. Next, we estimated multivariate autoregressive (MVAR) parameters using classical Kalman filter and general linear Kalman filter approaches followed by the calculation of partial directed coherence (PDC). MVAR parameters and PDC values for the selected sources were compared with the ground-truth. We found that the best strategy to extract the time series of a region of interest was to select a dipole with time series showing the highest correlation with the average time series in the region of interest. Dipole selection based on power or based on the largest singular value offer comparable alternatives. Among the different Kalman filter approaches, the use of a general linear Kalman filter was preferred to estimate PDC based connectivity except when only a small number of trials are available. In the latter case, the classical Kalman filter can be an alternative.
Appendix
Available only for authorised users
Literature
go back to reference Blackman RB, Tukey JW (1959) The measurement of power spectra: from the point of view of communications engineering. Dover Books on Engineering and Engineering Physics, Dover Blackman RB, Tukey JW (1959) The measurement of power spectra: from the point of view of communications engineering. Dover Books on Engineering and Engineering Physics, Dover
go back to reference Campbell K, Kumar A, Hofman W (1980) Human and automatic validation of a phase-locked loop spindle detection system. Electroencephalogr Clin Neurophysiol 48(5):602–605CrossRefPubMed Campbell K, Kumar A, Hofman W (1980) Human and automatic validation of a phase-locked loop spindle detection system. Electroencephalogr Clin Neurophysiol 48(5):602–605CrossRefPubMed
go back to reference Freiwald WA, Valdes P, Bosch J, Biscay R, Jimenez JC, Rodriguez LM, Rodriguez V, Kreiter AK, Singer W (1999) Testing non-linearity and directedness of interactions between neural groups in the macaque inferotemporal cortex. J Neurosci Methods 94(1):105–19CrossRefPubMed Freiwald WA, Valdes P, Bosch J, Biscay R, Jimenez JC, Rodriguez LM, Rodriguez V, Kreiter AK, Singer W (1999) Testing non-linearity and directedness of interactions between neural groups in the macaque inferotemporal cortex. J Neurosci Methods 94(1):105–19CrossRefPubMed
go back to reference Ghumare E, Schrooten M, Vandenberghe R, Dupont P (2015) Comparison of different Kalman filter approaches in deriving time varying connectivity from EEG data. In: 2015 37th Annual international conference of the IEEE engineering in medicine and biology society (EMBC). IEEE, pp 2199–2202. https://doi.org/10.1109/EMBC.2015.7318827 Ghumare E, Schrooten M, Vandenberghe R, Dupont P (2015) Comparison of different Kalman filter approaches in deriving time varying connectivity from EEG data. In: 2015 37th Annual international conference of the IEEE engineering in medicine and biology society (EMBC). IEEE, pp 2199–2202. https://​doi.​org/​10.​1109/​EMBC.​2015.​7318827
go back to reference Jeffs B, Leahy R, Singh M (1987) An evaluation of methods for neuromagnetic image reconstruction. IEEE Trans Bio-med Eng 34(9):713–723CrossRef Jeffs B, Leahy R, Singh M (1987) An evaluation of methods for neuromagnetic image reconstruction. IEEE Trans Bio-med Eng 34(9):713–723CrossRef
go back to reference Pascual-Marqui RD (2002) Standardized low-resolution brain electromagnetic tomography (sLORETA): technical details. Methods Find Exp Clin Pharmacol 24(Suppl D):5–12PubMed Pascual-Marqui RD (2002) Standardized low-resolution brain electromagnetic tomography (sLORETA): technical details. Methods Find Exp Clin Pharmacol 24(Suppl D):5–12PubMed
Metadata
Title
A Time-Varying Connectivity Analysis from Distributed EEG Sources: A Simulation Study
Authors
Eshwar G. Ghumare
Maarten Schrooten
Rik Vandenberghe
Patrick Dupont
Publication date
01-09-2018
Publisher
Springer US
Published in
Brain Topography / Issue 5/2018
Print ISSN: 0896-0267
Electronic ISSN: 1573-6792
DOI
https://doi.org/10.1007/s10548-018-0621-3

Other articles of this Issue 5/2018

Brain Topography 5/2018 Go to the issue