カイダ　ケンイチ   KAIDA Kenichi   海田　賢一    所属   埼玉医科大学  医学部 総合医療センター　脳神経内科    職種   教授
論文種別	学術雑誌(原著)
言語種別	英語
査読の有無	査読あり
表題	EEG topographical analysis of spatial disorientation
掲載誌名	正式名：Aviation Space and Environmental Medicine ISSNコード：00956562
巻・号・頁	70(3 I),256-263頁
著者・共著者	Osamu Tokumaru,Kenichi Kaida,Hiroshi Ashida,Ikuo Yoneda,Jiro Tatsuno
発行年月	1999/03
概要	Background: We examined EEG topography while subjects experienced spatial disorientation (SD) such as vection and somatogravic illusion (SGI). Methods: Five healthy male subjects were exposed to a rotating image evoking vection (Experiment 1) and to a 0.58 G linear forward acceleration evoking SGI (Experiment 2). The data were analog-to-digital converted with an epoch length of 1 s and a sampling frequency of 256 Hz. Polynomial coefficient vectors were calculated for the following analyses of EEG under the illusion: a) objective evaluation of topographical difference by two-way MANOVA b) visual inspection of the power spectra maps and c) logarithmic deviation ratio topography (log DRT). Results: MANOVA demonstrated significant differences in EEG topography in the high α band while the vection was evoked. No significant difference was revealed in any bands for SGI. Characteristic patterns common to all subjects were hardly identified on the power spectra maps. By log DRT under vection, a decrease of power was observed in the centro-parietal area on the left side in one subject, on the right in another subject, and in the mid-right frontal area in a third subject compared with the
PMID	10102738