title: Analysis of magnetic source localization of P300 using the multiple signal classification algorithm.
abstract: The authors studied the localization of P300 magnetic sources using the multiple signal classification (MUSIC) algorithm. Six healthy subjects (aged 24-34 years old) were investigated with 148-channel whole-head type magnetencephalography using an auditory oddball paradigm in passive mode. The authors also compared six stimulus combinations in order to find the optimal stimulus parameters for P300 magnetic field (P300m) in passive mode. Bilateral MUSIC peaks were located on the mesial temporal, superior temporal and parietal lobes. Interestingly, all MUSIC peaks in these regions emerged earlier in the right hemisphere than in the left hemisphere, suggesting that the right hemisphere has predominance over the left in the processing activity associated with P300m. There were no significant differences among the six stimulus combinations in evoking those P300m sources. The results of the present study suggest that the MUSIC algorithm could be a useful tool for analysis of the time-course of P300m.
authors.affiliation: Department of Neuropsychiatry, Okayama University Medical School, Shikata-cho, Okayama, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Uohashi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kitamura
authors.forename: Suguru
authors.initials: S
authors.lastname: Ishizu
authors.forename: Motoi
authors.initials: M
authors.lastname: Okamoto
authors.forename: Norihito
authors.initials: N
authors.lastname: Yamada
authors.forename: Shigetoshi
authors.initials: S
authors.lastname: Kuroda
mesh_terms: D000328:Adult; D000465:Algorithms; D003627:Data Interpretation, Statistical; D004569:Electroencephalography / Q000145:classification* / Q000706:statistics & numerical data*; D004574:Electromagnetic Fields; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005260:Female; D006801:Humans; D015225:Magnetoencephalography / Q000145:classification* / Q000706:statistics & numerical data*; D008297:Male