Frontal theta event-related synchronization: comparison of directed attention and working memory load effects.

Détails

ID Serval
serval:BIB_9BDFEDCF05A0
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Frontal theta event-related synchronization: comparison of directed attention and working memory load effects.
Périodique
Journal of Neural Transmission
Auteur(s)
Missonnier P., Deiber M.P., Gold G., Millet P., Gex-Fabry Pun M., Fazio-Costa L., Giannakopoulos P., Ibáñez V.
ISSN
0300-9564
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
113
Numéro
10
Pages
1477-1486
Langue
anglais
Notes
SAPHIRID:61595
Résumé
Early studies showed that long-term encoding and retrieval of new information is associated with modulation of the theta rhythm. More recently, changes in theta power amplitude over frontal electrode sites were reported during working memory, yet their relative significance in regard to attentional and memory processes remains unclear. Event-related synchronisation responses in the 4-7.5 Hz theta EEG frequency band was studied in 12 normal subjects performing four different tasks: two working memory tasks in which load varied from one (1-back task) to two (2-back task) items, an oddball detection (attention) task and a passive fixation task. A phasic theta increase was observed following stimulus apparition on all electrode sites within each task, with longer culmination peak and maximal amplitude over frontal electrodes. Frontal theta event-related synchronization (ERS) was of higher amplitude in the 1-back, 2-back and detection tasks as compared to the passive fixation task. Additionally, the detection task elicited a larger frontal and central theta ERS than the 2-back task. By analyzing theta ERS characteristics in various experimental conditions, the present study reveals that early phasic theta response over frontal regions primarily reflects the activation of neural networks involved in allocation of attention related to target stimuli rather than working memory processes.
Mots-clé
Adult, Brain/physiology, Cortical Synchronization, Evoked Potentials, Female, Humans, Male, Memory/physiology, Theta Rhythm
Pubmed
Web of science
Création de la notice
10/03/2008 12:04
Dernière modification de la notice
20/08/2019 16:02
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