Patent ID: 8914100

Claim:
An electroencephalogram measurement system comprising: an electroencephalogram measurement unit having a plurality of electrodes being disposed in one housing, the plurality of electrodes including a reference electrode, measurement electrodes and a ground, for measuring an electroencephalogram signal between the reference electrode and a measurement electrode on the basis of the ground, the plurality of electrodes constituting a plurality of electroencephalogram measurement channels, such that each electroencephalogram measurement channel is defined by at least the reference electrode and a measurement electrode; an electrode position storing unit for storing positions at which the plurality of electrodes respectively come in contact with a user when the user wears the electroencephalogram measurement unit; a frequency analysis unit for analyzing a frequency power of the electroencephalogram signal measured by the electroencephalogram measurement unit with respect to each electroencephalogram measurement channel; an insufficient electrode determination unit for distinguishing whether a state of attachment of each electrode is sufficient or not by comparing the frequency power analyzed by the frequency analysis unit against a predetermined first threshold value; and an insufficiency cause estimation unit for: determining the number of insufficient electrodes distinguished as insufficiently worn at the insufficient electrode determination unit; determining a position at which each insufficient electrode determined as insufficiently worn at the insufficient electrode determination unit is in contact with the user, by referring to the positions of the plurality of electrodes stored in the electrode position storing unit; and estimating a cause for the insufficient state of attachment of the insufficient electrode or electrodes that corresponds to the determined number of insufficient electrodes and position of each insufficient electrode, by comparing the determined number of insufficient electrodes and position of each insufficient electrode to insufficiency pattern data defining associations between a number of insufficient electrodes, a position at which each insufficient electrode comes in contact with the user, and causes for the insufficient state of attachment of an insufficient electrode or electrodes.