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Titolo:
SOMATOSENSORY-EVOKED MAGNETIC-FIELDS TO MEDIAN NERVE-STIMULATION - INTERHEMISPHERIC DIFFERENCES IN A NORMAL POPULATION
Autore:
WIKSTROM H; ROINE RO; SALONEN O; ARONEN HJ; VIRTANEN J; ILMONIEMI RJ; HUTTUNEN J;
Indirizzi:
UNIV HELSINKI,CENT HOSP,MED ENGN CTR,BIOMAG LAB,TUKHOLMANKATU 8 F FIN-00290 HELSINKI FINLAND UNIV HELSINKI,CENT HOSP,DEPT NEUROL FIN-00290 HELSINKI FINLAND UNIV HELSINKI,CENT HOSP,DEPT RADIOL FIN-00290 HELSINKI FINLAND UNIV HELSINKI,DEPT PSYCHOL,COGNIT BRAIN RES UNIT FIN-00290 HELSINKI FINLAND
Titolo Testata:
Electroencephalography and clinical neurophysiology. Evoked potentials
fascicolo: 6, volume: 104, anno: 1997,
pagine: 480 - 487
SICI:
0168-5597(1997)104:6<480:SMTMN->2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMARY SENSORIMOTOR CORTEX; HUMAN-BRAIN; RESPONSES; ORGANIZATION; ACTIVATION; LOCALIZATION; ASYMMETRIES; VIBRATION;
Keywords:
MAGNETOENCEPHALOGRAPHY; SOMATOSENSORY EVOKED MAGNETIC FIELDS; HEMISPHERIC ASYMMETRY;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
H. Wikstrom et al., "SOMATOSENSORY-EVOKED MAGNETIC-FIELDS TO MEDIAN NERVE-STIMULATION - INTERHEMISPHERIC DIFFERENCES IN A NORMAL POPULATION", Electroencephalography and clinical neurophysiology. Evoked potentials, 104(6), 1997, pp. 480-487

Abstract

The objective of the present study was to evaluate the normal interhemispheric variability of the locations and activation strengths of thesomatosensory cortices. Somatosensory evoked magnetic fields (SEFs) were recorded with a 122-channel magnetometer in 23 healthy subjects (mean age 57 years) to stimulation of left and right median nerves, Equivalent current dipole (ECD) strengths and locations were determined for the main SEF deflections at the contralateral primary sensorimotor (SMI) and secondary somatosensory (SIIc) cortices. In a Cartesian co-ordinate system, defined by the preauricular points and the nasion, the SMI sources were slightly but significantly more laterally and anteriorly located in the right than in the left hemisphere. No systematic co-ordinate asymmetries were found for the SIIc sources. In individual subjects, the interhemisphetic differences in the ECD co-ordinates averaged less than 6 mm at both SMI and SIlc. The group means of the source strengths did not differ. between the hemispheres, but individual differences were on average 20% for the SMI and 65% for the SIIc sources. We conclude that at the individual level, the median nerve SEFs fromSMI can be used to detect abnormally large interhemispheric asymmetries of source locations in the centimetre scale. (C) 1997 Elsevier Science Ireland Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 07:19:54