抄録
Drowsiness causes fatal and heavily injured traffic accidents. Therefore, the development of the method to prevent drivers' drowsiness is demanded. The supply of fragrance is one of the useful methods to awaken human, therefore, in this study (l)-menthol which has a stimulate effect was chosen and its effect was tested. The electrocardiogram which is one of the most convenient measurement methods was employed to detect subjects' drowsiness, then the variations of R-R Interval and autonomic nervous system were analyzed.
