PROBLEM TO BE SOLVED: To highly accurately provide a hypnotic index from electroencephalogram(EEG) dat by calculating a feature vector by detecting a partial degenerated block from the artifact of EEG data, and allocating this vector to a data cluster. SOLUTION: It is preferable to measure bipolar induction potential between two positions on a head 14 of a patient 12 by an induction instrument 10 for detecting the EEG of the patient 12, and an electrode 16 connected to the head 14 is connected through a lead wire 18 to a head shower 20. Then, an EEG signal is passed through an amplifier 22 and an analog filter 24 and in this case, a fault signal component having the frequency of 50Hz, for example, is removed. Afterwards, the signal is sent through an A/D converter 30 to a calculation system 32 inside a processor 28. In this case, the partial block is detected by the artifact of EEG data is detected, the feature vector is calculated from the processed EEG data and the artifact information, this feature vector is allocated to the data cluster expressed by a neuron, and an output data value is provided.
METHOD, DEVICE FOR EVALUATING EEG DATA AND TRAINING METHOD FOR NEURAL NETWORK