報告書番号

S02004

タイトル（和文）

副次行動を用いた覚醒度判定可能性の検討

タイトル（英文）

Study on the Possibility of Assessment of Alertness Using Subsidiary Behaviors

概要 （図表や脚注は「報告書全文」に掲載しております）

本研究では，副次行動を用いた覚醒度判定手法の確立を目的とし，その第一段階として副次行動が覚醒度を判定できるかどうかの可能性について検討を行った。単調作業時における各被験者の副次行動を抽出し，カテゴリー分けを行い，これと課題成績が脳波により測定された覚醒度と関連があるかどうかについて分析を行った。その結果，覚醒度のレベルにより，個人差に関係なく変化する副次行動が存在すること，いくつかの行動の生起数および，副次行動の出現総数を用いることで，その時点における作業者の覚醒度を判定することが出来ること，副次行動の種類により，覚醒度低下の前兆を表すものと覚醒度が低下してから現れるものがあること，などが得られた。以上より，副次行動を用いることで，簡便に作業者の覚醒の状態を誰もが何段階かに分けて判定出来ることが示唆された。また，覚醒度低下状態の予測に副次行動は有効な指標として利用出来ることがわかった。

概要 （英文）

The aim of this study is to explore the possibility of assessment of alertness using subsidiary behaviors. Using the previous experimental data, 8 subjects’ subsidiary behaviors, which appeared during 3 monotonous VDU tasks, were picked up by 3 experimenters. These behaviors were classified into 13 categories according to their similarity. As a physiological index, electroencephalogram, which was known as the most sensitive index for measuring alertness, were measured. To investigate whether the number of these behaviors could be utilized for assessment of alertness, the following studies were carried out: 1) the relationships among the task performance, categorized behaviors and EEG were analyzed to make sure whether alertness had an impact on the task performance and the behaviors, 2) using the task performance, the level of alertness was classified tentatively, then the behaviors that were changed by the classified level of alertness were specified, 3) to testify the possibility of assessment of alertness, discriminant analysis were conducted using the above behaviors, and 4) quantification analysis III and cross correlation analysis were carried out to explore if the behaviors could estimate a decline of alertness before the performance deteriorated.As the results of the above 4 points, the following were suggested: 1) some subsidiary behaviors were influenced by alertness, to say nothing of performance, 2) regardless of individual differences, there were some behaviors that were changed by the level of alertness which was tentatively classified in this study, 3), the level of alertness at the point could assess using some behaviors, such as "rub, pinch, and scratch", "ease the stiffness", "postural adjustments", "movement of eye’s and mouth", "action of low alertness", and 4) some behaviors indicated the premonitory sign of a decline in alertness, the other increased when a decline in alertness had been observed. Also, depends on alertness, there were some stages about the appearance of the categorized behaviors. From these results, it was suggested that everyone could assess the level of workers’ alertness using subsidiary behaviors. Moreover, the results revealed that subsidiary behaviors were useful index to estimate a decline in alertness.

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