title: Movement-related neuromagnetic fields and performances of single trial classifications.
abstract: In order to clarify whether neurophysiological profiles affect the performance of brain machine interfaces (BMI), we examined the relationships between amplitudes of movement-related cortical fields (MRCFs) and decoding performances during movement. Neuromagnetic activities were recorded in nine healthy participants during three types of unilateral upper limb movements. The movement types were inferred by a support vector machine. The amplitude of MRCF components, motor field (MF), movement-evoked field I (MEFI), and movement-evoked field II (MEFII) were compared with the decoding accuracies in all participants. Decoding accuracies at the latencies of MF, MEFI, and MEFII surpassed the chance level in all participants. In particular, accuracies at MEFI and MEFII were significantly higher in comparison with that of MF. The amplitudes and decoding accuracies were strongly correlated (MF, r(s)=0.90; MEFI, r(s)=0.90; and MEFII, r(s)=0.87). Our results show that the variation of MRCF components among participants reflects decoding performance. Neurophysiological profiles may serve as a predictor of individual BMI performance and assist in the improvement of general BMI performance.
authors.affiliation: Division of Functional Diagnostic Science, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Hisato
authors.initials: H
authors.lastname: Sugata
authors.forename: Tetsu
authors.initials: T
authors.lastname: Goto
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hirata
authors.forename: Takufumi
authors.initials: T
authors.lastname: Yanagisawa
authors.forename: Morris
authors.initials: M
authors.lastname: Shayne
authors.forename: Kojiro
authors.initials: K
authors.lastname: Matsushita
authors.forename: Toshiki
authors.initials: T
authors.lastname: Yoshimine
authors.forename: Shiro
authors.initials: S
authors.lastname: Yorifuji
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D006801:Humans; D015225:Magnetoencephalography / Q000379:methods; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D009482:Neurophysiology / Q000379:methods