著者

西藤 聖二 佐藤 政宏 舞野 大輔 田中 正吾

出版者

The Society of Life Support Engineering

雑誌

ライフサポート (ISSN:13419455)

巻号頁・発行日

vol.22, no.3, pp.96-104, 2010 (Released:2012-10-16)

参考文献数

16

被引用文献数

3 3

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本論文では,精神作業と音環境が脳電気活動に与える影響を評価するために,不快音/快音を聴きながら精神作業課題を遂行したときの脳波の振幅変化を調べた.α波の振幅は音刺激(5KHz 単音とパッヘルベルのカノン)を聴いたり,精神作業課題(暗算と記憶)遂行したり,あるいは両方を行ったときに,安静時のα波の振幅に比べて約15∼20%減少した.そのような振幅抑制は,α波の時間的位相揺らぎの15∼30%の増加と対応していた.特に,低域周波数のα波の振幅の低減割合は,組合せストレス,すなわち暗算と不快な5KHz音の条件下で25%に達するが,暗算単独で行ったときや5KHz単音単独で聴取した場合には15.20%の低減率に留まる.一方,β波とγ波の振幅はほとんどのストレス条件下で有意な変化を示さなかった.この結果は,音と精神ストレスが低域α波を抑制しており,ストレス計測において考慮されるべき点であることを示している.

著者

田中 正吾

出版者

The Society of Instrument and Control Engineers

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.36, no.3, pp.227-233, 2000-03-31 (Released:2009-03-27)

参考文献数

7

被引用文献数

5 4

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In attaining a high-aged and high-welfare society, various demands have been raised on health monitoring. One demand is to develop an unconstrained and noninvasive measurement instrument for respiration and heart rates. This is because they are the most basic information in monitoring the health of high-aged persons or patients in daily lives. Along this objective, several methods have been studied. But, the methods not only aimed to measure only one signal of the respiration and heart rates, but also were not the methods to assure a complete unconstrained measurement. Moreover, the methods needed much cost in making the equipment.The paper thus proposes a convenient measurement system which makes use of a wire-type respiration pick-up pasted on an air-mat (or water-mat), on which the subjects are laid down, and extracts the respiration and heart rates by applying low-pass and high-pass filters, respectively, to the data. Experiments show that the method offers accurate measurement of respiration and heart rates except for the duration of body movement. The measurement system is thus not only effective, but also easy to use for the cost, the size and the usage of the unconstrained and noninvasive type.