Electroencephalogram measurement system, electroencephalogram measurement method, and program thereof

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 and measurement electrodes, for measuring an electroencephalogram signal of a user between the reference electrode and a measurement electrode, 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;
• 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 estimating a cause for the insufficient state of attachment of the insufficient electrode or electrodes, wherein, when the number of insufficient electrodes distinguished as insufficiently worn at the insufficient electrode determination unit is equal to or less than a predetermined second threshold value, the insufficiency cause estimation unit estimates the cause to be existence of hair of the user between a head of the user and the insufficient electrode or electrodes distinguished as insufficiently worn.

An electroencephalogram measurement system comprising:

• a frequency analysis unit for analyzing a frequency power of an electroencephalogram signal measured by an electroencephalogram measurement section having a plurality of electrodes being disposed in one housing, the plurality of electrodes including a reference electrode, measurement electrodes and a ground, the electroencephalogram measurement section 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, the frequency power of the electroencephalogram signal being analyzed 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 and a position at which each insufficient electrode is in contact with the user, and estimating a cause for the insufficient state of attachment of the insufficient electrode or electrodes that corresponds to the determined number and positions of insufficient electrodes, 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, wherein
• the insufficiency cause estimation unit determines the position at which each insufficient electrode is in contact with the user by referring to positions of the plurality of electrodes stored in 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.

An electroencephalogram measurement method comprising:

• an electroencephalogram measurement step of measuring an electroencephalogram signal of a user with an electroencephalogram measurement unit by using a plurality of electrodes disposed in one housing, the plurality of electrodes including a reference electrode, measurement electrodes and a ground, the electroencephalogram signal being measured 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;
• a frequency analysis step of analyzing with a frequency analysis unit a frequency power of the electroencephalogram signal measured in the electroencephalogram measurement step with respect to each electroencephalogram measurement channel;
• an insufficient electrode determination step of, with an insufficient electrode determination unit, distinguishing whether a state of attachment of each electrode is sufficient or not by comparing the frequency power analyzed in the frequency analysis step against a predetermined first threshold value;
• a determination step of, with an insufficiency cause estimation unit, determining the number of insufficient electrodes distinguished as insufficiently worn at the insufficient electrode determination step, and determining a position at which each insufficient electrode determined as insufficiently worn at the insufficient electrode determination step is in contact with the user by referring to information of positions at which the plurality of electrodes respectively come in contact with the user when the user wears the housing at the electroencephalogram measurement step;
• and
• an insufficiency cause estimation step of, with the insufficiency cause estimation unit, 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.

A non-transitory computer-readable storage medium storing a computer program, to be executed by a computer for electroencephalogram measurement, wherein the computer program causes the computer to execute the steps of:

• an electroencephalogram measurement step of measuring an electroencephalogram signal of a user by using a plurality of electrodes disposed in one housing, the plurality of electrodes including a reference electrode, measurement electrodes and a ground, the electroencephalogram signal being measured 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;
• a frequency analysis step of analyzing a frequency power of the electroencephalogram signal measured in the electroencephalogram measurement step with respect to each electroencephalogram measurement channel;
• an insufficient electrode determination step of distinguishing whether a state of attachment of each electrode is sufficient or not by comparing the frequency power analyzed in the frequency analysis step against a predetermined first threshold value;
• a determination step of determining the number of insufficient electrodes distinguished as insufficiently worn at the insufficient electrode determination step, and determining a position at which each insufficient electrode determined as insufficiently worn at the insufficient electrode determination step is in contact with the user by referring to information of positions at which the plurality of electrodes respectively come in contact with the user when the user wears the housing at the electroencephalogram measurement step;
• and
• an insufficiency cause estimation step of 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.