Electroencephalogram recording apparatus, hearing aid, electroencephalogram recording method, and program thereof

1. An electroencephalogram recording apparatus comprising:

an acoustic transducer configured to collect external sounds to generate sound data;

an electroencephalograph which measures an electroencephalogram of a user to generate electroencephalogram data;

one or more memories; and

circuitry which in operation is configured to:

classify a sound collected by the acoustic transducer into one of a plurality of predetermined categories concerning a sound pressure of the sound;

determine whether or not to record the electroencephalogram data based on whether a number of times of data accumulation has reached a predetermined target value for the category into which the sound is classified; and

accumulate the electroencephalogram data and the sound data in association by recording the electroencephalogram data and the sound data in the one or more memories if the circuitry determines that the electroencephalogram data is to be recorded,

wherein, the circuitry is configured to designate the target value of the number of times of data accumulation for each category such that among the plurality of categories, a first value is designated as the target value for a first category into which sounds of an expected minimum value of sound pressure are classified, and a second value is designated as the target value for a second category into which any sound having a sound pressure value greater than the minimum value is classified, the first value being set equal to or greater than the second value.

2. The electroencephalogram recording apparatus of claim 1 , wherein, the circuitry further is configured to:

determine that the electroencephalogram data is to be recorded when the number of times of data accumulation in the category into which the sound is classified is smaller than the predetermined target value; and

determine that the electroencephalogram data is not to be recorded when the number of times of data accumulation in the category into which the sound is classified is equal to or greater than the predetermined target value.

3. The electroencephalogram recording apparatus of claim 1 , wherein, when the circuitry determines that the electroencephalogram data is to be recorded, the circuitry accumulates the sound and an electroencephalogram measured at a point in time at which the sound is collected, the sound and an electroencephalogram being kept in association.

4. The electroencephalogram recording apparatus of claim 1 , wherein, when an electroencephalogram component of interest in the electroencephalogram changes with the sound pressure value, the circuitry varies the target value in accordance with a level of the sound pressure value.

5. The electroencephalogram recording apparatus of claim 4 , wherein the circuitry designates an increasingly larger target value for a category into which sounds of increasingly smaller sound pressure values are classified.

6. The electroencephalogram recording apparatus of claim 4 , wherein the circuitry designates an increasingly smaller target value for a category into which sounds of increasingly larger sound pressure values are classified.

7. The electroencephalogram recording apparatus of claim 4 , wherein the circuitry designates an increasingly and linearly smaller target value for a category into which sounds of increasingly larger sound pressure values are classified.

8. The electroencephalogram recording apparatus of claim 4 , wherein the circuitry designates the first value as a common target value for two or more adjacent categories including the first category.

9. The electroencephalogram recording apparatus of claim 1 , wherein the circuitry further is configured to analyze the electroencephalogram or electroencephalograms accumulated in the one or more memories to determine whether the user has heard the sound or not, wherein,

the circuitry increases the target value for a category corresponding to any sound determined as not being heard by the user.

10. The electroencephalogram recording apparatus of claim 9 , wherein the circuitry analyzes an electroencephalogram response from the recorded data to estimate an uncomfortableness threshold value at which the user has felt uncomfortable, and changes the first value based on the uncomfortableness threshold value.

11. The electroencephalogram recording apparatus of claim 9 , wherein, the circuitry further is configured to:

classify the sound into one of a plurality of predetermined categories concerning the sound pressure and a frequency of the sound; and

identify a frequency which is difficult for the user to hear, and increases the target value for a category corresponding to the frequency.

12. The electroencephalogram recording apparatus of claim 1 , wherein the circuitry accumulates category information as a result of classification of the sound data, and accumulates an arithmetic mean of the electroencephalogram data for each category.

13. The electroencephalogram recording apparatus of claim 1 , wherein the electroencephalograph measures the electroencephalogram by using a reference electrode and a ground electrode, at least one of the reference electrode and a ground electrode being configured to be placed in an ear.

14. An electroencephalogram recording apparatus comprising:

an acoustic transducer configured to collect external sounds;

an electroencephalograph which measures an electroencephalogram of a user;

one or more memories; and

circuitry which in operation is configured to:

classify a sound collected by the acoustic transducer into one of a plurality of predetermined categories based on a sound pressure of the sound;

determine whether or not to record the electroencephalogram measured by the electroencephalograph based on whether a number of times of data accumulation has reached a predetermined target value for the category into which the sound is classified; and

accumulate in association the electroencephalogram and the sound for each category by recording electroencephalogram data and the sound data in the one or more memories if the circuitry determines that the electroencephalogram data is to be recorded, wherein,

the circuitry is configured to designate a target value of the number of times of data accumulation for each of the plurality of categories; and

the circuitry designates an increasingly larger target value for a category of an increasingly smaller sound pressure.

15. A hearing aid comprising:

the electroencephalogram recording apparatus of claim 1 ; and

circuitry which in operation is configured to:

perform a hearing assessment from data accumulated in the one or more memories;

perform a different acoustic aiding process depending on an output result from the hearing assessment; and

present a result of the acoustic aiding process to the user in the form of a sound.

16. An electroencephalogram recording method comprising the steps of:

collecting external sounds with an acoustic transducer to generate sound data;

measuring an electroencephalogram of a user with an electroencephalograph to generate electroencephalogram data; and

operating circuitry to perform the steps of:

classifying a sound collected by the step of collecting external sounds into one of a plurality of predetermined categories concerning a sound pressure of the sound;

determining whether the electroencephalogram data is to be recorded or not based on whether a number of times of data accumulation has reached a predetermined target value for the category into which the sound is classified; and

accumulating the electroencephalogram data and the sound data in association by recording the electroencephalogram data and the sound data in the one or more memories if the determining step determines that the electroencephalogram data is to be recorded, wherein,

a target value of the number of times of data accumulation is designated for each category such that among the plurality of categories, a first value is designated as the target value for a first category into which sounds of an expected minimum value of sound pressure are classified, and a second value is designated as the target value for a second category into which any sound having a sound pressure value greater than the minimum value is classified, the first value being set equal to or greater than the second value when executing the accumulating step.

17. A non-transitory computer-readable medium storing a computer program to be executed by a computer mounted in an electroencephalogram recording apparatus,

wherein the computer program causes the computer in the electroencephalogram recording apparatus to execute the steps of:

generating sound data of collected external sounds;

acquiring electroencephalogram data measured of a user;

classifying a collected sound into one of a plurality of predetermined categories concerning a sound pressure of the sound;

determining whether the electroencephalogram data is to be recorded or not based on whether a number of times of data accumulation has reached a predetermined target value for the category into which the sound is classified; and

accumulating the electroencephalogram data and the sound data in association by recording the electroencephalogram data and the sound data in one or more memories if the determining step determines that the electroencephalogram data is to be recorded, wherein,

a target value of the number of times of data accumulation is designated for each category such that among the plurality of categories, a first value is designated as the target value for a first category into which sounds of an expected minimum value of sound pressure are classified, and a second value is designated as the target value for a second category into which any sound having a sound pressure value greater than the minimum value is classified, the first value being set equal to or greater than the second value when executing the accumulating step.