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Titolo:
FUNCTIONAL LOCALIZATION OF BILATERAL AUDITORY CORTICES USING AN MRI-LINKED WHOLE HEAD MAGNETOENCEPHALOGRAPHY (MEG) SYSTEM
Autore:
NAKASATO N; FUJITA S; SEKI K; KAWAMURA T; MATANI A; TAMURA I; FUJIWARA S; YOSHIMOTO T;
Indirizzi:
TOHOKU UNIV,SCH MED,DEPT NEUROSURG,AOBA KU,1-1 SEIRYO CHO SENDAI MIYAGI 98077 JAPAN OSAKA GAS CO LTD OSAKA JAPAN
Titolo Testata:
Electroencephalography and clinical neurophysiology
fascicolo: 3, volume: 94, anno: 1995,
pagine: 183 - 190
SICI:
0013-4694(1995)94:3<183:FLOBAC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVOKED MAGNETIC-FIELDS; HUMAN-BRAIN; TONOTOPIC ORGANIZATION; NEUROMAGNETIC EVIDENCE; NEURONAL-ACTIVITY; SOURCE LOCATION; CORTEX; TRANSIENT;
Keywords:
FUNCTIONAL ANATOMY; AUDITORY CORTEX; AUDITORY EVOKED RESPONSE; DIPOLE MODEL; WHOLE HEAD MAGNETOMETRY; MAGNETIC RESONANCE IMAGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
N. Nakasato et al., "FUNCTIONAL LOCALIZATION OF BILATERAL AUDITORY CORTICES USING AN MRI-LINKED WHOLE HEAD MAGNETOENCEPHALOGRAPHY (MEG) SYSTEM", Electroencephalography and clinical neurophysiology, 94(3), 1995, pp. 183-190

Abstract

In 20 healthy subjects, auditory evoked magnetic fields were measuredover the entire head, using a helmet-shaped 66-channel MEG system linked to MRI. When the left or right ear was stimulated by 60 msec 2 kHztones, the prominent 100 msec response (N100m) appeared significantlyearlier in the contralateral hemisphere than in the ipsilateral one. In 16 cases, the N100m dipolar field patterns were clear in both hemispheres, overlapping each other across the midline. The N100m sources were estimated using a 2-dipole model in a spherical conducting medium with the size and location of the sphere determined individually according to the MRI images. No differences were found between the contralateral and ipsilateral N100m dipole positions in one hemisphere. When superimposed on MRI, the N100m dipoles were located precisely on the upper surface of bilateral temporal lobes with a standard deviation of 2.2 mm in the superior-inferior direction. In 16 right handed males, the right hemispheric N100m dipoles were 6 mm anterior to the left hemispheric dipoles. The whole head MEG is suitable to see small but significant differences of bilateral cerebral function, with exceptionally high spatial resolution, confirmed by the MRI-linked system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 11:14:10