BIOLOGICAL STATE ESTIMATION DEVICE AND COMPUTER PROGRAM

摘要

Provided is a technique for more accurately ascertaining a person's status. In particular, the present invention makes it possible to accurately ascertain the detection of alcohol or the like. A fluctuation waveform of an ultra-low-frequency band is found from a biosignal collected from a biosignal measuring means, the fluctuation waveform is plotted as coordinate points on a four-quadrant coordinate system on the basis of a predetermined standard, and biological status is estimated on the basis of temporal change in the coordinate points. According to the method of the present invention for plotting a fluctuation waveform as coordinate points on a four-quadrant coordinate system on the basis of the predetermined standard, change in the fluctuation waveform of the ultra-low-frequency band can be expanded or highlighted and thus perceived, and therefore the present invention is adapted for more accurately perceiving change in a person's status.

主权项

1. A biological state estimation device that estimates a biological state using a biological signal of an autonomic nervous system, collected by a biological signal measuring means, the biological state estimation device comprising:
a frequency analysis means that analyzes frequencies of the biological signal to obtain a fluctuation waveform in a ultra-low-frequency band of 0.001 Hz to 0.04 Hz; and a state estimation means that substitutes and displays the fluctuation waveform obtained by the frequency analysis means with index values regarding a sympathetic nerve and a parasympathetic nerve based on predetermined criteria to estimate the biological state based on a change with time in the index values.