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The purpose of this study is to develop a driver's arousal level preservation system while driving. One of the key issues of this system is to acquire the method of leading a drowsy driver to adequate condition of driving physiologically. In this paper, we examined the efficiency of a feedback stimulation made by driver's ECG as a fundamental study. The result of the experiment shows that the stimulation has a possibility of restraining parasympathetic nervous activity and it might be useful for the feedback stimulation of the system.