Beyond Pairwise Interactions: The Totally Antisymmetric Part of the Bispectrum as Coupling Measure of at Least Three Interacting Sources.
EEG
MEG
artifacts of volume conduction
bicoherence
cross-frequency coupling
Journal
Frontiers in neuroinformatics
ISSN: 1662-5196
Titre abrégé: Front Neuroinform
Pays: Switzerland
ID NLM: 101477957
Informations de publication
Date de publication:
2020
2020
Historique:
received:
17
06
2020
accepted:
22
09
2020
entrez:
19
11
2020
pubmed:
20
11
2020
medline:
20
11
2020
Statut:
epublish
Résumé
In this paper we make two contributions to the analysis of brain oscillations with CFC techniques. First, we introduce a new bispectral CFC measure which is selective to couplings between three or more brain sources. This measure can be derived from ordinary cross-bispectra by performing a total-antisymmetrization operation on them. Significant coupling values can then be attributed to at least three interacting signals. This selectivity to the number of sources can be helpful to test hypotheses on the number of brain sources involved in the generation of commonly observed brain oscillations, such as the alpha rhythm. In a second step we present the correct empirical distribution for the coupling measure, which is necessary to properly assess the significance of coupling results. More importantly however, this corrected statistic is not limited to our particular measure, but holds for all complex-valued coupling estimators. We illustrate how the very common misassumption of empirical normality of such estimators can lead to a systematic underestimation of
Identifiants
pubmed: 33209103
doi: 10.3389/fninf.2020.573750
pmc: PMC7649187
doi:
Types de publication
Journal Article
Langues
eng
Pagination
573750Informations de copyright
Copyright © 2020 Bartz, Andreou and Nolte.
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