title: Gamma-band desynchronization in language areas reflects syntactic process of words.
abstract: The aim of this study was to verify the relation between gamma-band activity and process of function words. We recorded the neuromagnetic signals in six healthy volunteers during silent reading of verbs (verb task) and forming of the past tenses (past-tense task) and investigated the spatio-temporal distribution of event-related desynchronization (ERD) and synchronization using synthetic aperture magnetometry. In both tasks, ERDs were observed simultaneously at multiple language-related areas. The left junctional area of inferior frontal sulcus and precentral sulcus and the left supramarginal gyrus showed stronger and/or longer-lasting ERDs in past-tense task than in verb task. This result suggests that the gamma-activities reflect the syntactic process of words.
authors.affiliation: Department of Basic Laboratory Science, Osaka University Graduate School of Medicine, 1-7 Yamadaoka, Suita, Osaka 565-0871, Japan. aya-i@sahs.med.osaka-u.ac.jp
authors.forename: Aya
authors.initials: A
authors.lastname: Ihara
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hirata
authors.forename: Kotoe
authors.initials: K
authors.lastname: Sakihara
authors.forename: Hiromi
authors.initials: H
authors.lastname: Izumi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kono
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Imaoka
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Osaki
authors.forename: Amami
authors.initials: A
authors.lastname: Kato
authors.forename: Toshiki
authors.initials: T
authors.lastname: Yoshimine
authors.forename: Shiro
authors.initials: S
authors.lastname: Yorifuji
mesh_terms: D000328:Adult; D000818:Animals; D001931:Brain Mapping; D003344:Cortical Synchronization; D005260:Female; D006801:Humans; D007802:Language; D008037:Linguistics; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D011932:Reading