Top-down reconfiguration of SMA cortical connectivity during action preparation.
Biological sciences
Methodology in biological sciences
Neurology
Journal
iScience
ISSN: 2589-0042
Titre abrégé: iScience
Pays: United States
ID NLM: 101724038
Informations de publication
Date de publication:
18 Aug 2023
18 Aug 2023
Historique:
received:
31
01
2023
revised:
31
03
2023
accepted:
17
07
2023
medline:
14
8
2023
pubmed:
14
8
2023
entrez:
14
8
2023
Statut:
epublish
Résumé
The Bereitschaftspotential (BP), a scalp potential recorded in humans during action preparation, is characterized by a slow amplitude increase over fronto-central regions as action execution approaches. We recorded TMS evoked-potentials (TEP) stimulating the supplementary motor area (SMA) at different time-points during a Go/No-Go task to assess whether and how cortical excitability and connectivity of this region change as the BP increases. When approaching BP peak, left SMA reactivity resulted greater. Concurrently, its effective connectivity increased with the left occipital areas, while it decreased with the right inferior frontal gyrus, indicating a fast reconfiguration of cortical networks during the preparation of the forthcoming action. Functional connectivity patterns supported these findings, suggesting a critical role of frequency-specific inter-areal interactions in implementing top-down mechanisms in the sensorimotor system prior to action. These findings reveal that BP time-course reflects quantitative and qualitative changes in SMA communication patterns that shape mechanisms involved in motor readiness.
Identifiants
pubmed: 37575197
doi: 10.1016/j.isci.2023.107430
pii: S2589-0042(23)01507-9
pmc: PMC10415800
doi:
Types de publication
Journal Article
Langues
eng
Pagination
107430Informations de copyright
© 2023 The Authors.
Déclaration de conflit d'intérêts
Authors declare that they have no competing interests.
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