Patent ID: 7206622

Claim:
A device to measure a degree of acquisition comprising: a measuring portion that measures a deoxy-Hb amount in a predetermined measuring region of a brain of a subject when the subject repeatedly conducts one work several times; a diachronic change data producing portion that obtains the deoxy-Hb amount measured in the above-mentioned measuring portion chronologically and produces diachronic change data as data showing diachronic change of a blood volume amount or/and a blood component amount; a waveform output portion that outputs a waveform of the diachronic change data in each work; and an acquisition degree determining portion that determines a degree of acquisition of the subject for each repetition of the work based on the diachronic change data, the acquisition degree determining portion determining that the acquisition degree is low when the deoxy-Hb amount increases on the initiation of the work and determining that the acquisition degree is high when the deoxy-Hb amount remains generally unchanged or decreases irrespective of time change in diachronic change data during performing the work.