聴覚野における音脈分凝に関わる機能的ネットワークの下部構造

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2012/07/01

タイトル(英語): Substructure of Functional Network for Auditory Stream Segregation in Auditory Cortex

著者名: 野田　貴大（東京大学大学院情報理工学系研究科知能機械情報学専攻），神崎　亮平（東京大学大学院情報理工学系研究科知能機械情報学専攻／東京大学先端科学技術研究センター），高橋　宏知（東京大学大学院情報理工学系研究科知能機械情報学専攻／東京大学先端科学技術研究センター／科学技術振興機構　さきがけ）

著者名(英語): Takahiro Noda (Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo), Ryohei Kanzaki (Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo/Research Center for Advanced Science and Technology, The University of Tokyo), Hirokazu Takahashi (Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo/Research Center for Advanced Science and Technology, The University of Tokyo/PRESTO, JST)

キーワード: 聴覚野，ラット，ガンマ帯域同期活動，位相同期度，音脈分凝　　auditory cortex，rat，gamma-band synchrony，phase locking value，auditory stream segregation

要約(英語): Perceptual integration and segregation of alternating tone sequence differing in frequency (ABA-ABA-…) depend on the frequency differences (ΔFs) between A and B tones and the inter-tone intervals (ITIs) between successive tones. In the auditory cortex, tonotopic separation, forward suppression and multisecond habituation have been considered as possible neural mechanisms of this perceptual phenomenon. These mechanisms, however, cannot completely account for the van Noorden's perceptual boundary and the temporally continuous perception of auditory streaming. Here we examined the temporal changes of the functional network properties in the auditory cortex in response to tone sequences with different ΔFs and ITIs. Specifically, we recorded local field potentials using microelectrode arrays from anesthetized rats and constructed the functional network based on phase synchrony in gamma-band oscillation. Consequently, the networks consisted of sub-networks highly correlated with the place code of frequency, i.e., tonotopic map, and the sub-network selective to B tones lasted for a prolonged period at large ΔF. Such characteristic substructures of functional network are a possible candidate of neural basis of auditory stream segregation.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.132 No.7 （2012） 特集：平成23年電気学会電子・情報・システム部門大会

本誌掲載ページ: 1079-1087 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/132/7/132_1079/_article/-char/ja/