Electrode attachment state determination system, electrode attachment state determination method, and program thereof
First Claim
1. An electrode attachment state determination system comprising:
- an electroencephalogram measurement unit for measuring an electroencephalogram signal of a user by using at least one set of electrodes, the set including a ground electrode, a reference electrode, and a measurement electrode;
a frequency analysis section for performing a frequency analysis of the electroencephalogram signal;
an insufficient electrode determination section for extracting at least one parameter of a total frequency power across and all bands and at least one parameter of a noise amount from a result of the frequency analysis, and through a comparison of a value of the at least one noise parameter against a predetermined noise threshold value and through a comparison of a value of the at least one total frequency power parameter against a predetermined total frequency power threshold value, determining whether the ground electrode, the reference electrode, or the measurement electrode has an insufficient state of attachment; and
an output section for, when an insufficient state of attachment is determined, presenting information indicating the insufficient state of attachment of the electrode to the user;
wherein the electroencephalogram measurement unit measures a first potential difference between the ground electrode and the reference electrode and a second potential difference between the ground electrode and the measurement electrode, and measures the electroencephalogram signal based on a difference between the second potential difference and the first potential difference;
the electrode attachment state determination system further comprising an electrode restoration determination unit for determining, based on a signal measured by using an insufficient electrode which is determined as having an insufficient state of attachment, whether the insufficiency in the state of attachment of the insufficient electrode has been eliminated or not, wherein,when the insufficient electrode is one of the reference electrode and the measurement electrode,the electrode restoration determination unit calculates an average value and variance of the signal as measured by using the insufficient electrode, and, if both of the average value and the variance are zero, the electrode restoration determination unit determines that the insufficiency in the state of attachment of the insufficient electrode has not been eliminated, or if not both of the average value and the variance are zero, the electrode restoration determination unit determines that the insufficiency in the state of attachment of the insufficient electrode has been eliminated.
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Accused Products
Abstract
An electrode attachment state determination system includes: an electroencephalogram measurement section for measuring an electroencephalogram signal of a user by using at least one set of electrodes including a ground electrode, a reference electrode, and a measurement electrode; a frequency analysis section for performing a frequency analysis of the electroencephalogram signal; an insufficient electrode determination section for extracting at least one parameter of a total frequency power and a noise amount from a result of the frequency analysis, and through a comparison of a value of the parameter against a predetermined threshold value, determining whether the ground electrode, the reference electrode, or the measurement electrode has an insufficient state of attachment; and an output section for, when an insufficient state of attachment is determined, presenting information indicating the insufficient state of electrode attachment to the user.
12 Citations
14 Claims
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1. An electrode attachment state determination system comprising:
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an electroencephalogram measurement unit for measuring an electroencephalogram signal of a user by using at least one set of electrodes, the set including a ground electrode, a reference electrode, and a measurement electrode; a frequency analysis section for performing a frequency analysis of the electroencephalogram signal; an insufficient electrode determination section for extracting at least one parameter of a total frequency power across and all bands and at least one parameter of a noise amount from a result of the frequency analysis, and through a comparison of a value of the at least one noise parameter against a predetermined noise threshold value and through a comparison of a value of the at least one total frequency power parameter against a predetermined total frequency power threshold value, determining whether the ground electrode, the reference electrode, or the measurement electrode has an insufficient state of attachment; and an output section for, when an insufficient state of attachment is determined, presenting information indicating the insufficient state of attachment of the electrode to the user; wherein the electroencephalogram measurement unit measures a first potential difference between the ground electrode and the reference electrode and a second potential difference between the ground electrode and the measurement electrode, and measures the electroencephalogram signal based on a difference between the second potential difference and the first potential difference; the electrode attachment state determination system further comprising an electrode restoration determination unit for determining, based on a signal measured by using an insufficient electrode which is determined as having an insufficient state of attachment, whether the insufficiency in the state of attachment of the insufficient electrode has been eliminated or not, wherein, when the insufficient electrode is one of the reference electrode and the measurement electrode, the electrode restoration determination unit calculates an average value and variance of the signal as measured by using the insufficient electrode, and, if both of the average value and the variance are zero, the electrode restoration determination unit determines that the insufficiency in the state of attachment of the insufficient electrode has not been eliminated, or if not both of the average value and the variance are zero, the electrode restoration determination unit determines that the insufficiency in the state of attachment of the insufficient electrode has been eliminated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
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9. An electrode attachment state determination system comprising:
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an electroencephalogram measurement unit for measuring an electroencephalogram signal of a user by using at least one set of electrodes, the set including a ground electrode, a reference electrode, and a measurement electrode; a frequency analysis unit for performing a frequency analysis of the electroencephalogram signal; an insufficient electrode determination unit for extracting at least one parameter of a total frequency power across all bands and at least one parameter of a noise amount from a result of the frequency analysis, and through a comparison of a value of the at least one noise parameter against a predetermined noise threshold value and through a comparison of a value of the at least one total frequency power parameter against a predetermined total frequency power threshold value, determining whether the ground electrode, the reference electrode, or the measurement electrode has an insufficient state of attachment; and an output unit for, when an insufficient state of attachment is determined, presenting information indicating the insufficient state of attachment of the electrode to the user; wherein the electroencephalogram measurement unit measures a first potential difference between the ground electrode and the reference electrode and a second potential difference between the ground electrode and the measurement electrode, and measures the electroencephalogram signal based on a difference between the second potential difference and the first potential difference; the electrode attachment state determination system further comprising a measurement electrode replacement unit for, based on prestored electrode information, replacing an insufficient electrode which is determined as having an insufficient state of attachment with a replacing electrode, wherein, the electrode information describes information of a type and position of each of electrodes which are available for measuring an electroencephalogram signal of the user; with respect to an insufficient electrode which is determined as having an insufficient state of attachment, the measurement electrode replacement unit identifies the type and position of the insufficient electrode, and refers to the electrode information to identify the replacing electrode based on electroencephalographic characteristics of an electroencephalogram signal to be measured by the insufficient electrode; and instead of the insufficient electrode, the electroencephalogram measurement unit uses the identified replacing electrode to measure an electroencephalogram signal. - View Dependent Claims (10, 11)
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13. An electrode attachment state determination method comprising the steps of:
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measuring an electroencephalogram signal of a user by using at least one set of electrodes including a ground electrode, a reference electrode, and a measurement electrode; performing a frequency analysis of the electroencephalogram signal; from a result of the frequency analysis, extracting at least one parameter of a total frequency power across all bands and at least one parameter of a noise amount, and through a comparison of a value of the at least one noise parameter against a predetermined noise threshold value and through a comparison of a value of the at least one total frequency power parameter against a predetermined total frequency power threshold value, determining whether the ground electrode, the reference electrode, or the measurement electrode has an insufficient state of attachment; and when an insufficient state of attachment is determined, outputting a notification to the user indicating a position and a type of electrode that has become insufficient wherein measuring an electroencephalogram signal of a user includes measuring a first potential difference between the ground electrode and the reference electrode and a second potential difference between the ground electrode and the measurement electrode, and measuring the electroencephalogram signal based on a difference between the second potential difference and the first potential difference; determining, based on a signal measured by using an insufficient electrode which is determined as having an insufficient state of attachment, whether the insufficiency in the state of attachment of the insufficient electrode has been eliminated or not, wherein, when the insufficient electrode is one of the reference electrode and the measurement electrode, calculating an average value and variance of the signal as measured by using the insufficient electrode, and, if both of the average value and the variance are zero, determining that the insufficiency in the state of attachment of the insufficient electrode has not been eliminated, or if not both of the average value and the variance are zero, determining that the insufficiency in the state of attachment of the insufficient electrode has been eliminated.
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14. A non-transitory computer-readable storage medium storing a computer program to be executed by a computer for determining a state of electrode attachment, wherein the computer program causes the computer to execute the steps of:
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measuring an electroencephalogram signal of a user by using at least one set of electrodes including a ground electrode, a reference electrode, and a measurement electrode; performing a frequency analysis of the electroencephalogram signal; from a result of the frequency analysis, extracting at least one parameter of a total frequency power across all bands and at least one parameter of a noise amount, and through a comparison of a value of the at least one noise parameter against a predetermined noise threshold value and through a comparison of a value of the at least one total frequency power parameter against a predetermined total frequency power threshold value, determining whether the ground electrode, the reference electrode, or the measurement electrode has an insufficient state of attachment; and when an insufficient state of attachment is determined, outputting a notification to the user indicating a position and a type of electrode that has become insufficient; wherein measuring an electroencephalogram signal of a user includes measuring a first potential difference between the ground electrode and the reference electrode and a second potential difference between the ground electrode and the measurement electrode, and measuring the electroencephalogram signal based on a difference between the second potential difference and the first potential difference; determining, based on a signal measured by using an insufficient electrode which is determined as having an insufficient state of attachment, whether the insufficiency in the state of attachment of the insufficient electrode has been eliminated or not, wherein, when the insufficient electrode is one of the reference electrode and the measurement electrode, calculating an average value and variance of the signal as measured by using the insufficient electrode, and, if both of the average value and the variance are zero, determining that the insufficiency in the state of attachment of the insufficient electrode has not been eliminated, or if not both of the average value and the variance are zero, determining that the insufficiency in the state of attachment of the insufficient electrode has been eliminated.
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Specification