Experimental results of measuring human fatigue by utilizing uttered voice processing

It is possible to measure human cerebral activity by utilizing a new chaotic method for analyzing the spoken voice. In experiments, we measured the Flicker Frequency and voice-derived Cerebral Exponents of subjects at 12-minutes intervals during a ten-hour railway driving simulation exercise. The results confirm that our analysis method is able to measure human central nervous system activity levels, as is possible using the Flicker Tester, from speech. We believe that it will be possible to evaluate the mental and physical condition of critical workers in real-time in their working environments by monitoring only their speech. We also believe that workspace safety will be much improved by the introduction of the new chaotic voice analyzer.