Gamma band functional connectivity reduction in patients with amnestic mild cognitive impairment and epileptiform activity.
MCI
epileptiform activity
functional connectivity
gamma
Journal
Brain communications
ISSN: 2632-1297
Titre abrégé: Brain Commun
Pays: England
ID NLM: 101755125
Informations de publication
Date de publication:
2022
2022
Historique:
received:
14
03
2021
revised:
29
11
2021
accepted:
01
02
2022
entrez:
14
3
2022
pubmed:
15
3
2022
medline:
15
3
2022
Statut:
epublish
Résumé
There is growing evidence for neuronal hyperexcitability in Alzheimer's disease. Hyperexcitability is associated with an increase in epileptiform activity and the disruption of inhibitory activity of interneurons. Interneurons fire at a high rate and are frequently associated with high-frequency oscillations in the gamma frequency band (30-150 Hz). It is unclear how hyperexcitability affects the organization of functional brain networks. A sample of 63 amnestic mild cognitive impairment patients underwent a magnetoencephalography resting-state recording with eyes closed. Twenty (31.75%) mild cognitive impairment patients had epileptiform activity. A cluster-based analysis of the magnetoencephalography functional connectivity revealed a region within the right temporal cortex whose global connectivity in the gamma frequency band was significantly reduced in patients with epileptiform activity relative to those without epileptiform activity. A subsequent seed-based analysis showed that this was largely due to weaker gamma band connectivity of this region with ipsilateral frontal and medial regions, and the upper precuneus area. In addition, this reduced functional connectivity was associated with higher grey matter atrophy across several cortical regions in the patients with epileptiform activity. These functional network disruptions and changes in brain physiology and morphology have important clinical implications as they may contribute to cognitive decline in mild cognitive impairment and Alzheimer's disease.
Identifiants
pubmed: 35282163
doi: 10.1093/braincomms/fcac012
pii: fcac012
pmc: PMC8914494
doi:
Types de publication
Journal Article
Langues
eng
Pagination
fcac012Informations de copyright
© The Author(s) 2022. Published by Oxford University Press on behalf of the Guarantors of Brain.
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