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Titolo:
ACTIVATION OF A DISTRIBUTED SOMATOSENSORY CORTICAL NETWORK IN THE HUMAN BRAIN - A DIPOLE MODELING STUDY OF MAGNETIC-FIELDS EVOKED BY MEDIANNERVE-STIMULATION .1. LOCATION AND ACTIVATION TIMING OF SEF SOURCES
Autore:
MAUGUIERE F; MERLET I; FORSS N; VANNI S; JOUSMAKI V; ADELEINE P; HARI R;
Indirizzi:
HOP NEUROL,DEPT FUNCT NEUROL & EPILEPTOL F-69003 LYON FRANCE HELSINKI UNIV TECHNOL,LOW TEMP LAB,BRAIN RES UNIT FIN-02150 ESPOO FINLAND HCL,DEPT MED INFORMAT F-69003 LYON FRANCE
Titolo Testata:
Electroencephalography and clinical neurophysiology. Evoked potentials
fascicolo: 4, volume: 104, anno: 1997,
pagine: 281 - 289
SICI:
0168-5597(1997)104:4<281:AOADSC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICAL-STIMULATION; OBJECT RECOGNITION; LATENCY ACTIVITY; MACAQUE MONKEYS; LATERAL SULCUS; AWAKE MONKEYS; CORTEX; POTENTIALS; AREAS; 2ND;
Keywords:
SOMATOSENSORY EVOKED FIELDS; MEG; SI AREA; SII AREA; POSTERIOR PARIETAL CORTEX; FRONTAL CORTEX; HUMAN BRAIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
F. Mauguiere et al., "ACTIVATION OF A DISTRIBUTED SOMATOSENSORY CORTICAL NETWORK IN THE HUMAN BRAIN - A DIPOLE MODELING STUDY OF MAGNETIC-FIELDS EVOKED BY MEDIANNERVE-STIMULATION .1. LOCATION AND ACTIVATION TIMING OF SEF SOURCES", Electroencephalography and clinical neurophysiology. Evoked potentials, 104(4), 1997, pp. 281-289

Abstract

Cortical areas responsive to somatosensory inputs were assessed by recording somatosensory evoked magnetic fields (SEF) to electrical stimulation of the left median nerve at wrist, using a 122-SQUID neuromagnetometer in various conditions of stimulus rate, attentional demand anddetection task. Source modelling combined with magnetic resonance imaging (MRI) allowed localisation of six SEF sources on the outer aspectof the hemispheres located respectively: (1) in the posterior bank ofthe rolandic fissure (area SI), the upper bank of the sylvian fissure(parietal opercular area SII) and the banks of the intraparietal fissure contralateral to stimulation, (2) in the SII area ipsilateral to stimulation and (3) in the mid-frontal or inferior frontal gyri on bothsides. All source areas were found to be simultaneously active at 70-140 ms after the stimulus, the SI source was the only one active already at 20-60 ms. The observed activation timing suggests that somatosensory input from SI is processed to higher-order areas through serial feedforward projections. However the long-lasting activations of all sources and their overlap in time is also compatible with a top-down control mediated via backward projections. (C) 1997 Elsevier Science Ireland Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 21:31:14