title: Variation of frontal P20 potential due to rotation of the N20-P20 dipole moment of SEPs.
abstract: We have applied the artificial neural network method to estimate the N20-P20 dipole from scalp SEP potentials, and have investigated the rotation of the dipole moment caused by the compression effect of a brain tumor (para-Rolandic tumor) adjacent to the central sulcus. The variation of the frontal P20 potential was demonstrated by the rotation of the N20-P20 dipole moment in 8 cases of para-Rolandic tumor. By estimation of the rotation of the dipole moment, it may be possible to obtain preoperative information regarding the relation between the central sulcus and the tumor.
authors.affiliation: Department of Neurological Surgery, School of Medicine, University of Tokushima, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Okada
authors.forename: F
authors.initials: F
authors.lastname: Shichijo
authors.forename: K
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Y
authors.initials: Y
authors.lastname: Kinouchi
mesh_terms: D000328:Adult; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D001932:Brain Neoplasms / Q000503:physiopathology*; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology*; D006801:Humans; D008297:Male