近年，電子書籍などのように，電子ディスプレイ上で文章を読む機会が増えた．本研究では，脳波を用いて紙媒体と電子ディスプレイ各々おける文章黙読時のヒトの感性・精神的負荷の客観的評価を行った．すなわち，紙媒体と電子ディスプレイにおいて文字の大きさが異なる文章を黙読している最中の脳波を採取し，α波とβ波の特徴量を求めた．この結果，文章黙読時において小さな文字を読む場合にβ波が多く出る傾向があること，また特に電子ディスプレイにおいて，小さな文字を読んだ時にβ波含有率／α波含有率が高くなり，大きな文字を読んだ場合に対して有意差が表れた．β波含有率／α波含有率はヒトの精神的負荷を表すことが，他者の研究においても紹介されており，紙媒体では，文字の大小による負荷の度合はそれほど違わないが，電子ディスプレイの場合は小さな文字に対して，精神的負荷が高くなる傾向にあるということが示されたと言える．%Electronic books are becoming popular nowadays, and we are expected to read books on such electronic displays more and more in future. In this research, human mental stress is assessed using electroencephalogram(EEG) while people read sentences on paper and on electronic display respectively. That is to say, EEG is measured while subjects read sentences written in small letters and large letters on paper and electronic display, and the amounts of α-wave and β-wave are analyzed. As a result, it became clear that P-wave is dominant when people read sentences written in small letters. Especially when they read on the electronic display, the ratio of the amount of P-wave to that of a-wave is higher in the case of small letters than large letters with significance. It is said that this ratio indicates the degree of mental stress, thus we can say that the difference between the degrees of stress caused by small letters and large letters is not so large in reading on papers, but large in reading on electronic display.
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