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Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view
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 conduct...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4548479/ https://www.ncbi.nlm.nih.gov/pubmed/25979156 http://dx.doi.org/10.1016/j.ijpsycho.2015.05.004 |
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author | Burle, Borís Spieser, Laure Roger, Clémence Casini, Laurence Hasbroucq, Thierry Vidal, Franck |
author_facet | Burle, Borís Spieser, Laure Roger, Clémence Casini, Laurence Hasbroucq, Thierry Vidal, Franck |
author_sort | Burle, Borís |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-4548479 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-45484792015-09-03 Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view Burle, Borís Spieser, Laure Roger, Clémence Casini, Laurence Hasbroucq, Thierry Vidal, Franck Int J Psychophysiol Article 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. Elsevier 2015-09 /pmc/articles/PMC4548479/ /pubmed/25979156 http://dx.doi.org/10.1016/j.ijpsycho.2015.05.004 Text en © 2015 The Authors. Published by Elsevier B.V. http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Burle, Borís Spieser, Laure Roger, Clémence Casini, Laurence Hasbroucq, Thierry Vidal, Franck Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view |
title | Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view |
title_full | Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view |
title_fullStr | Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view |
title_full_unstemmed | Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view |
title_short | Spatial and temporal resolutions of EEG: Is it really black and white? A scalp current density view |
title_sort | spatial and temporal resolutions of eeg: is it really black and white? a scalp current density view |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4548479/ https://www.ncbi.nlm.nih.gov/pubmed/25979156 http://dx.doi.org/10.1016/j.ijpsycho.2015.05.004 |
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