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Titolo:
Spatial-temporal structures of human alpha rhythms: Theory, microcurrent sources, multiscale measurements, and global binding of local networks
Autore:
Nunez, PL; Wingeier, BM; Silberstein, RB;
Indirizzi:
Tulane Univ, Dept Biomed Engn, Lindy Boggs Ctr 500, Brain Phys Grp, New Orleans, LA 70118 USA Tulane Univ New Orleans LA USA 70118 Phys Grp, New Orleans, LA 70118 USA Swinburne Univ Technol, Brain Sci Inst, Melbourne, Vic, Australia Swinburne Univ Technol Melbourne Vic Australia Melbourne, Vic, Australia
Titolo Testata:
HUMAN BRAIN MAPPING
fascicolo: 3, volume: 13, anno: 2001,
pagine: 125 - 164
SICI:
1065-9471(200107)13:3<125:SSOHAR>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-RESOLUTION EEG; CLOSED-HEAD INJURY; CEREBRAL-CORTEX; NEOCORTICAL INTERACTIONS; STATISTICAL-MECHANICS; WORKING-MEMORY; ELECTROPHYSIOLOGICAL CORRELATE; SYNCHRONIZATION ERS; BIOPHYSICAL LINKAGE; SURFACE LAPLACIANS;
Keywords:
high-resolution EEG; dura image; Laplacian; synaptic action; spherical harmonics; brain dynamics; spatial scale; binding problem; coherence; phase synchronization;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
178
Recensione:
Indirizzi per estratti:
Indirizzo: Nunez, PL Tulane Univ, Dept Biomed Engn, Lindy Boggs Ctr 500, Brain Phys Grp, New Orleans, LA 70118 USA Tulane Univ New Orleans LA USA 70118 New Orleans, LA 70118 USA
Citazione:
P.L. Nunez et al., "Spatial-temporal structures of human alpha rhythms: Theory, microcurrent sources, multiscale measurements, and global binding of local networks", HUM BRAIN M, 13(3), 2001, pp. 125-164

Abstract

A theoretical framework supporting experimental measures of dynamic properties of human EEG is proposed with emphasis on distinct alpha rhythms. Robust relationships between measured dynamics and cognitive or behavioral conditions are reviewed, and proposed physiological bases for EEG at cellular levels are considered. Classical EEG data are interpreted in the context of a conceptual framework that distinguishes between locally and globally dominated dynamic processes, as estimated with coherence or other measures of phase synchronization. Macroscopic (scalp) potentials generated by cortical,current sources are described at three spatial scales, taking advantage ofthe columnar structure of neocortex. New EEG data demonstrate that both globally coherent and locally dominated behavior can occur within the alpha band, depending on narrow band frequency, spatial measurement scale, and brain state. Quasi-stable alpha phase structures consistent with global standing waves are observed. At the same time, alpha and theta phase locking between cortical regions during mental calculations is demonstrated, consistentwith neural network formation. The brain-binding problem is considered in the context of EEG dynamic behavior that generally exhibits both of these local and global aspects. But specific experimental designs and data analysis methods may severely bias physiological interpretations in either local or global directions. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 12:36:34