骨導超音波の2音融合閾値と自動車運転における精神疲労との関連性

摘要

疲労が原因の交通事故や労働災害は深刻な社会問題でrnある．実際の自動車運転状況における疲労をもたらrnすメカニズムは非常に複雑であり，道路状況などの環境rn要因，車両特性に起因する車両要因，及び運転者自身にrn関係する人間要因など種々の要因が影響し合ったものでrnある．%Bone-conducted vibrations up to 50 kHz (150 kHz or more in the young) can be heard by most people, including some subjects normally regarded as totally deaf at ordinary frequencies both to air-borne and to bone-conducted sound. Therefore, echolocation is also possible by direct listening to the reflected ultrasonic echoes (△t) in the high audio range, after brain ultrasonic demodulation which, owing to its frequency separation, will not interfere with speech communication. The purpose of this work is to study whether the sensitivity of auditory order threshold by bone-conducted ultrasound is influenced by the factors of driver fatigue.