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Titolo:
Neuromagnetic source localization of auditory evoked fields and intracerebral evoked potentials: a comparison of data in the same patients
Autore:
Godey, B; Schwartz, D; de Graaf, JB; Chauvel, P; Liegeois-Chauvel, C;
Indirizzi:
Univ Rennes 1, Fac Med, Lab IDM, UPRES EA 3192, F-35043 Rennes, France Univ Rennes 1 Rennes France F-35043 PRES EA 3192, F-35043 Rennes, France Univ Mediterranee, Lab Neurophysiol & Neuropsychol, INSERM, E9926, Marseille, France Univ Mediterranee Marseille France ol, INSERM, E9926, Marseille, France
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 10, volume: 112, anno: 2001,
pagine: 1850 - 1859
SICI:
1388-2457(200110)112:10<1850:NSLOAE>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-FIELDS; NOISE BURSTS; RESPONSES; CORTEX; MEG; COMPONENTS; EEG; BRAIN; MODEL; MRI;
Keywords:
auditory evoked responses; depth recordings; magneto-encephalography; source localization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Godey, B Univ Rennes 1, Fac Med, Lab IDM, UPRES EA 3192, CS 34317,Ave Pr Leon Bernard, F-35043 Rennes, France Univ Rennes 1 CS 34317,Ave Pr Leon Bernard Rennes France F-35043
Citazione:
B. Godey et al., "Neuromagnetic source localization of auditory evoked fields and intracerebral evoked potentials: a comparison of data in the same patients", CLIN NEU, 112(10), 2001, pp. 1850-1859

Abstract

Objective: To compare the localizations of different neural sources (a) obtained from intracerebral evoked responses and (b) calculated from surface auditory evoked field responses recorded in the same subjects. Our aim was to evaluate the resolving power of a source localization method currently used in our laboratory, which is based on a recent spatio-temporal algorithmused in magneto-encephalography (MEG). Methods: Auditory evoked responses were studied in 4 patients with medically intractable epilepsy. These responses were recorded from depth electrodes implanted in the auditory cortex for pre-surgical evaluation (stereo-electro-encephalography (SEEG)). as well as from surface captors (for MEG) placed on the scalp after removal of the depth electrodes. Auditory stimuli were clicks and short tone bursts with different frequencies. Results: All middle-latency components (from 13 to 70 ms post-stimulus onset) were recorded and localized (via SEEG) along Heschl's gyrus (HG). MEG reliably localized Pam and Plm in the same area of HG that intracerebral recordings localized them in. No significant delay between SEEG and MEG latencies was observed. Both methods suggest that N1 is generated from different sources in the intermediate and lateral parts of the HG and in the planum temporale (PT). The source of P2 (PT and/or Area 22) remains unclear and wasin one case, localized in different regions according to the method used. This latter component may therefore also be generated by different sources. Conclusions: The results suggest that both techniques are useful and may be used together in a complementary fashion. Intracerebral recordings allow the researcher to validate and interpret surface recordings. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 23:12:59