Title :

Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view

Author(s) :

Burle, Borís [Auteur]
Laboratoire de Neurosciences Cognitives [Marseille] [LNC]
Spieser, Laure [Auteur]
Laboratoire de Neurosciences Cognitives [Marseille] [LNC]
Roger, Clemence [Auteur]
Sciences Cognitives et Sciences Affectives (SCALab) - UMR 9193
Laboratoire Sciences Cognitives et Sciences Affectives - UMR 9193 [SCALab]
Casini, Laurence [Auteur]
Laboratoire de Neurosciences Cognitives [Marseille] [LNC]
Hasbroucq, Thierry [Auteur]
Laboratoire de Neurosciences Cognitives [Marseille] [LNC]
Vidal, Franck [Auteur]
Laboratoire de Neurosciences Cognitives [Marseille] [LNC]

Journal title :

International Journal of Psychophysiology

Abbreviated title :

Int J Psychophysiol

Volume number :

97

Pages :

210-220

Publication date :

2015-09

ISSN :

1872-7697

English keyword(s) :

EEG
Current Source Density
Time resolution

HAL domain(s) :

Sciences cognitives

English abstract : [en]

Among the different brain imaging techniques, electroencephalography (EEG) is classically considered as having an excellent temporal resolution, but a poor spatial one. Here, we argue that the actual temporal resolution ...
Show more >Among the different brain imaging techniques, electroencephalography (EEG) is classically considered as having an excellent temporal resolution, but a poor spatial one. Here, we argue that the actual temporal resolution of conventional (scalp potentials) EEG is overestimated, and that volume conduction, the main cause of the poor spatial resolution of EEG, also distorts the recovered time course of the underlying sources at scalp level, and hence degrades the actual temporal resolution of EEG. While Current Source Density (CSD) estimates, through the Surface Laplacian (SL) computation, are well known to dramatically reduce volume conduction effects and hence improve EEG spatial resolution, its positive impact on EEG temporal resolution is much less recognized. In two simulation studies, we first show how volume conduction and reference electrodes distort the scalp potential time course, and how SL transform provides a much better spatio-temporal description. We then exemplify similar effects on two empirical datasets. We show how the time courses of the scalp potentials mis-estimate the latencies of the relevant brain events and that CSD provides a much richer, and much more accurate, view of the spatio-temporal dynamics of brain activity.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
CHU Lille

Collections :

• Sciences Cognitives et Sciences Affectives (SCALab) - UMR 9193

Research team(s) :

Équipe Action, Vision et Apprentissage (AVA)

Submission date :

2019-02-13T14:50:49Z
2020-04-14T11:55:54Z
2022-05-18T08:07:24Z
2022-05-18T08:09:25Z