Investigating the origin of phase delays in the alpha band - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2022

Investigating the origin of phase delays in the alpha band

Côme Le Breton
  • Fonction : Auteur
  • PersonId : 1123842
Théodore Papadopoulo
Maureen Clerc
  • Fonction : Auteur
  • PersonId : 843531

Résumé

Traveling (or propagating) wave are oscillating electrical voltages observed sequentially or simultaneously at different brain locations, relating them functionally. They are observed at various scales, all over the brain, in various frequency bands and following varied stimuli (or in their absence), making them an ubiquitous phenomenon. Ermentrout and Kleinfeld [2001] proposed three possible mechanisms: 1) A unique oscillator activating cortical areas with different time delays (resulting in a spurious wave), 2) A chain of successively activated oscillators, 3) Coupled local oscillators generating wave propagation due to phase delay. In scalp EEG, volume conduction considerably complicates the problem, and allows to consider a fourth “mechanism”, in which only two sources can generate phase delays at many electrodes. We show that phase differences in the α band appear along the anteroposterior axis during the ECR condition, and this pattern is stable across recordings taken years apart. A simplistic model of two sources is enough to model phase differences incompatible with transmission delays. Care must therefore be brought to the apriori misconception that PLI index is not sensitive to volume conduction.

Domaines

Neurosciences
Fichier principal
Vignette du fichier
neuromod_poster.pdf (4.04 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03878789 , version 1 (30-11-2022)

Identifiants

  • HAL Id : hal-03878789 , version 1

Citer

Côme Le Breton, Théodore Papadopoulo, Maureen Clerc. Investigating the origin of phase delays in the alpha band. NeuroMod Meeting 2022, Jun 2022, Antibes, France. ⟨hal-03878789⟩
15 Consultations
5 Téléchargements

Partager

Gmail Facebook X LinkedIn More