Comparing Trends of Sleepiness Expressions Appearance with Performance and Physiological Change Caused by Arousal Level Declining

Abstract

Trends of tracking error, reaction time, heart rate, eye closure, Electroencephalogram (EEG), and sleepiness expression on monotonous task were measured and compared. Sleepiness expression had the strongest correlation with EEG in comparison with the other indexes. Tracking error and reaction time increased after participants were evaluated as falling into doze by sleepiness expression. These results show that sleepiness expression is useful to measure drivers' sleepiness level before falling into a doze. In addition, three types of trends were found on heart rate.