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Titolo:
VISUAL-EVOKED MAGNETIC RESPONSES TO CENTRAL AND PERIPHERAL STIMULATION - SIMULTANEOUS VEP RECORDINGS
Autore:
BRECELJ J; KAKIGI R; KOYAMA S; HOSHIYAMA M;
Indirizzi:
NATL INST PHYSIOL SCI,DEPT INTEGRAT PHYSIOL OKAZAKI AICHI 444 JAPAN NATL INST PHYSIOL SCI,DEPT INTEGRAT PHYSIOL OKAZAKI AICHI 444 JAPAN UNIV LJUBLJANA,MED CTR,INST CLIN NEUROPHYSIOL LJUBLJANA 61000 SLOVENIA
Titolo Testata:
Brain topography
fascicolo: 3, volume: 10, anno: 1998,
pagine: 227 - 237
SICI:
0896-0267(1998)10:3<227:VMRTCA>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD; CORTEX; POTENTIALS; TOPOGRAPHY; COMPONENT; MAP;
Keywords:
MAGNETOENCEPHALOGRAPHY; PATTERN REVERSAL STIMULATION; STRIATE CORTEX; VISUAL EVOKED MAGNETIC FIELDS; VISUAL EVOKED POTENTIALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
J. Brecelj et al., "VISUAL-EVOKED MAGNETIC RESPONSES TO CENTRAL AND PERIPHERAL STIMULATION - SIMULTANEOUS VEP RECORDINGS", Brain topography, 10(3), 1998, pp. 227-237

Abstract

Visual evoked magnetic field (VEF) and visual evoked potentials (VEP)in response to pattern reversal left half-field central (0-2 degrees,0-5 degrees) and to left half-field peripheral stimulation (2-15 degrees, 5-15 degrees) were simultaneously recorded in 10 normal subjects. The aim was to localize the origin of the largest wave around 100 ms. By comparing the magnetic evoked 100m wave and electric evoked P100 wave, we found that the response to the small central field (0-2 degrees) stimulation was clearly evident in the VEP and not in the VEF, while the response to the peripheral field (2-15 degrees, 5-15 degrees) stimulation was clearly present in both the VEP and VEF. Our findings show that in contrast to the already recognized predominantly macular origin of VEP activity, VEF activity has a peripheral rather than macular prevalence. Our VEF findings are related to the retinotopic organization of the visual cortex; the 100m dipole to the central field (0-5 degrees) was localized more (1.04 +/- 0.84 cm) posterior than was the 100m dipole to peripheral stimulation (5-15 degrees). The localization of 100m dipoles superimposed on magnetic resonance images (MRI) to central stimuli showed interindividual variations that were in agreement with the known variability of the central field representation in the striate cortex: on the convexity of the occipital pole, in the outer surface of the occipital lobe, and around the calcarine fissure of the right hemisphere. In contrast, following peripheral stimulation, the 100m dipole was located along the medial surface of the hemisphere or in the calcarine fissure. Our results suggest that the main origin of the largest wave around 100ms in response to pattern reversal stimuli is in the striate cortex.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/01/20 alle ore 07:37:54