Duffing 振動子による精神負荷度合の評価に関する検討

抄録

Serious accidents have happened in many cases caused by the decrease of arousal level, and it is known that the arousal level decreases due to driving and simple tasks, such as an easy calculatation. System to accurately evaluate arousal level in real time in order to prevent such accidents is required. In this paper, we examined whether the parameters of the mathematical model could be used as a method to evaluate the arousal level. The modified Duffing oscillator was proposed as a mathematical model to perform simplified parameters identification. It was applied to EEG data, which is obtained by EEG acquisition experimentation in relaxed states and concentrated state. As a result of the parameters identification in theta band, alpha band, beta band, and 4-30 Hz band, it is shown that t h e parameter B is repeating increase and decrease with time progress of each experiment. A result of investigating a correlation between conventional arousal level and parameter B shows a significant correlation. It is suggested that the parameter B of the modified Duffing oscillator is related to the conventional arousal level and it can calculate the arousal level in real time since this evaluation method of arousal level does not require to analyze each band.