Patent ID: 8795175

Claim:
A biological measurement apparatus comprising: a measurement unit configured to acquire information corresponding to a cerebral blood volume variation of a test body, and to output a first signal indicating the cerebral blood volume variation corresponding to the information; and an analysis unit configured to: acquire a first power spectrum calculated from the first signal; acquire a second signal indicating heart rate variation calculated from the heartbeat intervals in the first signal; acquire a second power spectrum based on the second signal; calculate, from the first power spectrum, a first power intensity ratio which is a ratio of a power intensity in a predetermined first frequency band and a power intensity in a second frequency band; and calculate, from the second power spectrum, a second power intensity ratio which is a ratio of the power intensity in the first frequency band and the power intensity in the second frequency band, wherein the biological measurement apparatus is configured to output information regarding a brain blood-vessel state in accordance with a large/small relationship of the first power intensity ratio and the second power intensity ratio.