Brain-scale cortico-cortical functional connectivity in the delta-theta band is a robust signature of conscious states: an intracranial and scalp EEG study.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
20 08 2020
20 08 2020
Historique:
received:
05
02
2020
accepted:
22
07
2020
entrez:
22
8
2020
pubmed:
21
8
2020
medline:
24
4
2021
Statut:
epublish
Résumé
Long-range cortico-cortical functional connectivity has long been theorized to be necessary for conscious states. In the present work, we estimate long-range cortical connectivity in a series of intracranial and scalp EEG recordings experiments. In the two first experiments intracranial-EEG (iEEG) was recorded during four distinct states within the same individuals: conscious wakefulness (CW), rapid-eye-movement sleep (REM), stable periods of slow-wave sleep (SWS) and deep propofol anaesthesia (PA). We estimated functional connectivity using the following two methods: weighted Symbolic-Mutual-Information (wSMI) and phase-locked value (PLV). Our results showed that long-range functional connectivity in the delta-theta frequency band specifically discriminated CW and REM from SWS and PA. In the third experiment, we generalized this original finding on a large cohort of brain-injured patients. FC in the delta-theta band was significantly higher in patients being in a minimally conscious state (MCS) than in those being in a vegetative state (or unresponsive wakefulness syndrome). Taken together the present results suggest that FC of cortical activity in this slow frequency band is a new and robust signature of conscious states.
Identifiants
pubmed: 32820188
doi: 10.1038/s41598-020-70447-7
pii: 10.1038/s41598-020-70447-7
pmc: PMC7441406
doi:
Substances chimiques
Hypnotics and Sedatives
0
Propofol
YI7VU623SF
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
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