Biological state estimation device, biological state estimation method, computer program, and recording medium

A non-transitory computer storage medium that stores a computer program causing a computer as a biological state estimation device to execute a biological state estimation procedure for estimating a biological state by analyzing a biosignal of a person measured by a biosignal measurement device,

• the computer program causing the computer to execute:
• as the biological state estimation procedure,
• a frequency gradient time-series waveform calculation procedure which, from time-series data of the biosignal, obtains a time-series fluctuation of a frequency and obtains a gradient in a predetermined time range of the time-series fluctuation of the frequency, and obtains a time-series fluctuation of the gradient as a frequency gradient time-series waveform;
• a frequency analysis procedure which frequency-analyzes the frequency gradient time-series waveform every predetermined time range;
• and
• an estimation procedure which compares an output result of the frequency analysis obtained by the frequency analysis procedure every predetermined time range with corresponding data of output results of brain waves of different biological states to the output result of the frequency analysis, which are stored in the computer beforehand, and estimates a time-series variation of a biological state which is specified by a state of the brain wave and brain waves by means of a time-series variation of the output result of the frequency analysis.

A biological state estimation method which estimates a biological state by using a biosignal, the method comprising:

• from time-series data of the biosignal, obtaining a time-series fluctuation of a frequency and obtaining a gradient in a predetermined time range of the time-series fluctuation of the frequency, and obtaining a time-series fluctuation of the gradient as a frequency gradient time-series waveform;
• frequency-analyzing the frequency gradient time-series waveform every predetermined time range;
• and
• comparing an output result of the frequency analysis obtained every predetermined time range with preset corresponding data of output results of brain waves of different biological states to the output result of the frequency analysis and estimating a time-series variation of a biological state which is specified by a state of the brain wave and brain waves by means of a time-series variation of the output result of the frequency analysis.