WO2019078326A1 - Système d'évaluation, procédé d'évaluation, programme et support d'enregistrement non temporaire pour dispositif de mesure d'activité cérébrale - Google Patents

Système d'évaluation, procédé d'évaluation, programme et support d'enregistrement non temporaire pour dispositif de mesure d'activité cérébrale Download PDF

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Publication number
WO2019078326A1
WO2019078326A1 PCT/JP2018/038930 JP2018038930W WO2019078326A1 WO 2019078326 A1 WO2019078326 A1 WO 2019078326A1 JP 2018038930 W JP2018038930 W JP 2018038930W WO 2019078326 A1 WO2019078326 A1 WO 2019078326A1
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WIPO (PCT)
Prior art keywords
brain activity
load
electrode
evaluation
head
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PCT/JP2018/038930
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English (en)
Japanese (ja)
Inventor
晃久 奥谷
潤一 牛場
幸治 森川
幹生 岩川
Original Assignee
パナソニック株式会社
学校法人慶應義塾
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Application filed by パナソニック株式会社, 学校法人慶應義塾 filed Critical パナソニック株式会社
Priority to JP2019549356A priority Critical patent/JP6935660B2/ja
Publication of WO2019078326A1 publication Critical patent/WO2019078326A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
    • A61B5/291—Bioelectric electrodes therefor specially adapted for particular uses for electroencephalography [EEG]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/369—Electroencephalography [EEG]

Definitions

  • the present disclosure relates to an evaluation system, an evaluation method, a program, and a non-temporary recording medium of a brain activity measurement device. More specifically, the present disclosure relates to an evaluation system, an evaluation method, and a program for a brain activity measurement apparatus for evaluating the accuracy and safety of a brain activity measurement apparatus for measuring a blood flow state of brain surface or brain surface of brain waves or brain cortex. And non-transitory recording media.
  • An electroencephalograph described in Patent Document 1 is illustrated as an example of a conventional brain activity measurement device.
  • the electroencephalograph described in Patent Document 1 comprises a belt-like main body frame that extends from the top of the head toward the left and right tragus when worn on the head, and an electroencephalographic electrode movable in the longitudinal direction of the main body frame Is equipped.
  • the electroencephalogram electrode is pressed against the head mainly by the spring force of a coil spring.
  • redness erythema
  • the EEG electrode is pressed to the scalp with an appropriate pressing force. It is desirable to apply.
  • the object of the present disclosure is to provide an evaluation system, an evaluation method, a program, and a non-temporary recording medium of a brain activity measurement device capable of simply and appropriately evaluating a load applied to a subject's head from the brain activity measurement device. It is to be.
  • a brain activity measurement device having a contact portion to be brought into contact with the head of the subject to measure the brain activity of the subject causes the contact portion to contact It has a main body that can be mounted in a closed state.
  • the evaluation system comprises a transducer provided on the body for converting a load into an electrical signal.
  • the said converter is arrange
  • a transducer provided on a main body mountable to the brain activity measurement device is brought into contact with a head in order to measure brain activity by the brain activity measurement device. Placed at the site receiving load from the contact part.
  • the said evaluation method converts into an electric signal the load which the said site
  • a program according to an aspect of the present disclosure causes a computer system to execute a method of evaluating a brain activity measurement device.
  • the non-temporary recording medium is a computer system-readable non-temporary recording medium in which a program for causing a computer system to execute a method of evaluating a brain activity measuring device is recorded.
  • FIG. 1 is a schematic view showing a state of use of an electroencephalogram measurement system including a headset that is an evaluation target of an evaluation system according to an embodiment of the present disclosure, and a rehabilitation support system including the same.
  • FIG. 2 is a block diagram showing the configuration of the above-mentioned electroencephalogram measurement system and rehabilitation support system.
  • FIG. 3A is a schematic top view showing the usage state of the above headset.
  • FIG. 3B is a schematic front view showing the usage state of the above headset.
  • FIG. 4 is a block diagram showing the configuration of the above evaluation system.
  • FIG. 5 is an equivalent circuit of the converter in the evaluation system of the same.
  • FIG. 6 is a perspective view of a head model in the evaluation system of the same.
  • FIG. 7 is an exploded perspective view of the above-mentioned head model.
  • FIG. 8A is a front view of a head model of the same.
  • FIG. 8B is a plan view of the above-mentioned head model.
  • FIG. 8C is a left side view of the above head model.
  • FIG. 9A is a front view showing a first curve on the head model of the same.
  • FIG. 9B is a left side view in which the first curve and the second curve are clearly shown on the same head model as above.
  • FIG. 10A is a front view of the load receiving seat at the same time.
  • FIG. 10B is a left side view of the above-described load receptacle.
  • FIG. 10C is a rear view of the above-mentioned load receptacle.
  • FIG. 10A is a front view of the load receiving seat at the same time.
  • FIG. 10B is a left side view of the above-described load receptacle.
  • FIG. 10D is a sectional view taken along line XX in FIG. 10A.
  • FIG. 11 is a cross-sectional perspective view of the main part of the above-mentioned head model.
  • FIG. 12 is a front view of the head model in the above with the headset attached.
  • FIG. 13 is a flowchart of a program executed by the microcontroller in the evaluation device of the same.
  • FIG. 14 is a block diagram showing a configuration of an evaluation system according to another embodiment of the present disclosure.
  • FIG. 15 is a perspective view of the load receiving seat at the same time.
  • the brain activity measurement apparatus (hereinafter referred to as the headset 1) constitutes an electroencephalogram measurement system 10 together with the information processing apparatus 2.
  • the electroencephalogram measurement system 10 is a system for measuring the electroencephalogram of the subject 5, and the electroencephalogram from the electrode unit 11 disposed at a position corresponding to the measurement point 51 which is a part of the head 52 of the subject 5 Get information.
  • the term “electroencephalogram (EEG)” as referred to in the present disclosure means a waveform obtained by extruding an electrical signal (action potential) emitted from a cerebral nerve cell (group) and recording it.
  • the electroencephalogram measurement system 10 includes a headset 1 (see FIG. 3B) having an electrode unit 11 and an information processing device 2.
  • the headset 1 is mounted on the head 52 of the subject 5 with the electrode unit 11 in contact with the surface (scalp) of the head 52 of the subject 5.
  • the electrode unit 11 contacts the surface of the head 52 by being placed on the paste (electrode paste) applied to the surface of the head 52.
  • the electrode unit 11 contacts the surface of the head 52 without the hair by scraping the hair.
  • the electrode unit 11 may be in direct contact with the surface of the head 52 without applying a paste.
  • contacting the electrode unit 11 with the surface of the head 52 refers to contacting the electrode unit 11 directly with the surface of the head 52 (including the scalp) or via an intermediate. It also includes bringing the electrode portion 11 into contact with the surface of the head 52 indirectly.
  • the intermediate is not limited to the paste, and may be, for example, a gel having conductivity.
  • the headset 1 measures the brain waves of the subject 5 by measuring the action potential of the brain of the subject 5 with the electrode unit 11, and generates brain wave information representing the brain waves.
  • the headset 1 transmits brain wave information to the information processing apparatus 2 by wireless communication, for example.
  • the information processing apparatus 2 mainly includes, for example, a computer system such as a personal computer.
  • the information processing apparatus 2 receives brain wave information from the headset 1 by wireless communication, for example, performs various processes on the brain wave information acquired from the headset 1, and displays the brain wave information.
  • detection of an electroencephalogram including characteristic changes that occur when the subject 5 performs a voluntary movement that is, can occur when the subject 5 intends to perform a voluntary exercise
  • the calibration process and the like are performed by the information processing apparatus 2.
  • the “calibration process” in the present disclosure is a process for analyzing brain wave information, that is, for determining various parameters used for detection of a brain wave to be detected.
  • the headset 1 includes a frame 17, an attachment portion 19, and a pair of holding portions 18.
  • the frame 17 is attachable to the head 52 of the subject 5 and is attached to the head 52 in a first direction from the central portion (vertex) of the subject 5 to the left and right tragus It has a shape extending to D1.
  • the “center-center portion” is a position represented by an electrode symbol “Cz” in the international 10-20 method, and in the head 52 of the subject 5, the nose of the subject 5 and the occipital nodule And the line connecting the front end point of the left ear 521 and the front end point of the right ear 522 are crossing points.
  • the central central portion of the subject 5, the left tragus and the right tragus are connected along the head 52 in a state in which the frame 17 is attached to the head 52. It is a direction parallel to the curve.
  • the attachment portion 19 is provided on the frame 17 and can accommodate the electrode portion 11 used to collect brain waves of the subject 5.
  • the electrode unit 11 contacts a position corresponding to the measurement point 51 on the surface of the head 52 in a state where the frame 17 is attached to the head 52.
  • the frame 17 is provided with a pair of attachment portions 19.
  • the pair of holding portions 18 is connected to both ends of the frame 17 in the first direction D1, and contacts the head 52 in a state where the frame 17 is mounted on the head 52.
  • the holding portions 18 are provided at both ends of the frame 17 in the first direction D1.
  • maintenance parts 18 hold
  • the above-described electroencephalogram measurement system 10 is used, for example, in a rehabilitation support system 100 shown in FIG.
  • the rehabilitation support system 100 is a system for supporting the rehabilitation of the subject 5 using the electroencephalogram measurement system 10 including the headset 1.
  • the rehabilitation support system 100 supports rehabilitation by means of exercise therapy, with a person who has exercise paralysis or a decline in motor function or the like in a part of the body as a subject 5, for example, by a brain disease such as a stroke or an accident.
  • a voluntary exercise which is a movement performed by the subject 5 based on the intention or intention of the subject 5 may not be satisfied due to the inability or the deterioration of the function thereof.
  • the “exercise therapy” referred to in the present disclosure is a disorder caused by exercising the inability part of such a voluntary exercise or a part where a decrease in function has occurred (hereinafter referred to as “disability site”) in the body of the subject 5 It means a method to restore the function of voluntary movement for the part.
  • the rehabilitation support system 100 includes an electroencephalogram measurement system 10 (including a headset 1), an exercise assistance device 3, and a control device 4.
  • the exercise assisting device 3 is a device that assists the exercise of the subject 5 by adding at least one of a mechanical stimulation and an electrical stimulation to the subject 5. Since the rehabilitation support system 100 is used for rehabilitation of the left finger of the subject 5, the exercise assisting apparatus 3 is mounted on the left hand of the subject 5 as shown in FIG. 1.
  • the rehabilitation support system 100 described below is used for the rehabilitation of the grasping motion and the extension motion by the left finger of the subject 5.
  • the “gripping operation” in the present disclosure means an operation of holding an object.
  • the “extension operation” in the present disclosure is grasped by an operation of opening the hand by the extension of four fingers 53 (second to fifth fingers) other than the first finger (thumb), that is, by the holding operation. It means the action of releasing the "object" of the state. That is, in the subject 5, the left finger is the injury site, and the rehabilitation support system 100 is used for the rehabilitation of the voluntary movement of the grasping motion and the extension motion by the left finger.
  • the rehabilitation support system 100 indirectly assists in the rehabilitation of the grasping motion by assisting the extension motion of the finger of the subject 5, instead of directly assisting the grasping motion of the subject 5. Do.
  • the rehabilitation support system 100 when the subject 5 tries to perform the extension motion as a voluntary exercise, the exercise assisting device 3 attached to the left hand of the subject 5 mechanically contacts the left finger 53 of the subject 5 And / or electrical stimulation to assist voluntary exercise. That is, the rehabilitation support system 100 assists the voluntary movement (extension movement) when releasing the peg 101 by the extension movement of the finger 53 from the posture in which the subject 5 holds the peg 101 (see FIG. 1) with the left finger. .
  • the present invention is not limited to this example, and the rehabilitation support system 100 may be used, for example, for rehabilitation of the right finger of the subject 5.
  • the exercise assistance device 3 has a finger drive device 31 and an electrical stimulation generator 32 as shown in FIG.
  • the finger driving device 31 holds four fingers 53 (second to fifth fingers) except the first finger (thumb) and applies mechanical stimulation (external force) to the four fingers 53. , Is a device to move the four fingers 53.
  • the finger driving device 31 includes, for example, a power source such as a motor or a solenoid, and moves the four fingers 53 by transmitting the force generated by the power source to the four fingers 53.
  • the finger drive device 31 moves the held four fingers 53 in a direction away from the first finger (i.e., extending movement) and moves the finger 53 in a direction approaching the first finger (i.e., gripping movement).
  • Two types of operations are possible: a closing operation.
  • the opening operation of the finger driving device 31 assists the extension operation of the subject 5
  • the closing operation of the finger driving device 31 assists the gripping operation of the subject 5.
  • the electrical stimulation generator 32 is a device that applies an electrical stimulation to a site for moving the finger 53 of the subject 5.
  • the site for moving the finger 53 of the subject 5 includes a site corresponding to at least one of the muscle and the nerve of the finger 53 of the subject 5.
  • the part for moving the finger 53 of the subject 5 is a part of the arm of the subject 5.
  • the electrical stimulation generator 32 includes, for example, a pad attached to the body (for example, an arm) of the subject 5.
  • the electrical stimulation generator 32 stimulates a site for moving the finger 53 by applying an electrical stimulation (electric current) to the body of the subject 5 from the pad.
  • the control device 4 controls the exercise assistance device 3 based on the electroencephalogram information acquired by the electroencephalogram measurement system 10. In other words, the control device 4 controls the exercise assistance device 3 in accordance with the brain waves of the subject 5 collected by the electrode unit 11 of the headset 1.
  • the control device 4 is electrically connected to the information processing device 2 of the electroencephalogram measurement system 10 and the exercise assisting device 3.
  • the control device 4 is connected to a power cable for supplying operation power for the exercise assisting device 3 and the control device 4.
  • the control device 4 includes a drive circuit for driving the finger drive device 31 of the exercise assisting device 3 and an oscillation circuit for driving the electrical stimulation generator 32.
  • the control device 4 receives a control signal from the information processing device 2 by, for example, wired communication.
  • the drive circuit drives the finger drive device 31 of the exercise assisting device 3 and the finger drive device 31 performs an “open operation”. Control the exercise assisting device 3; Further, when the control device 4 receives the second control signal from the information processing device 2, the drive circuit drives the finger drive device 31 of the exercise assisting device 3 and the finger drive device 31 performs the “closing operation”. Control the exercise assistance device 3 to be controlled. In addition, when the control device 4 receives the third control signal from the information processing device 2, the control device 4 drives the electric stimulation generator 32 of the exercise assisting device 3 by the oscillation circuit, and the body of the subject 5 is electrically stimulated. The exercise assist device 3 is controlled to be given.
  • control device 4 controls the exercise assistance device 3 based on the control signal output from the electroencephalogram measurement system 10 to thereby provide the exercise assistance device based on the electroencephalogram information acquired by the electroencephalogram measurement system 10. It is possible to control three.
  • control device 4 controls the exercise assisting device 3 so that the “opening operation” and the “closing operation” are performed by the finger drive device 31 according to the operation of the operation switch provided in the control device 4 You can also.
  • the rehabilitation support system 100 assists the voluntary exercise It will be possible. Therefore, according to the rehabilitation support system 100, as in the case where the medical staff assists, rehabilitation by exercise therapy can be realized more effectively than when the subject 5 performs voluntary exercise alone.
  • the rehabilitation support system 100 can support the voluntary exercise of the subject 5 with the exercise assisting device 3 when the subject 5 tries to do voluntary exercise.
  • the rehabilitation support system 100 is an exercise assisting device 3 adapted to the voluntary exercise of the subject 5 by linking the exercise assisting device 3 to the brain wave (brain wave information) of the subject 5 measured by the electroencephalogram measurement system 10.
  • the rehabilitation support system 100 uses a brain-machine interface (BMI) technology to operate a machine (exercise assistance device 3) using brain activity (brain waves) to exercise Realize rehabilitation by therapy.
  • BMI brain-machine interface
  • characteristic changes in the electroencephalogram may occur. That is, when the subject 5 intends to perform voluntary exercise, activation of a brain region corresponding to a site targeted for voluntary exercise may occur.
  • An example of such a brain region is the somatosensory motor cortex.
  • a more effective rehabilitation can be expected if the exercise assist device 3 assists the voluntary exercise of the subject 5 according to the timing at which such activation of the brain region occurs. Such activation of the brain region can be detected as a characteristic change of the electroencephalogram.
  • the rehabilitation support system 100 executes the assistance of the voluntary exercise of the subject 5 with the exercise assistance device 3 in accordance with the timing at which this characteristic change occurs in the electroencephalogram of the subject 5.
  • Such characteristic changes may occur when the subject 5 images a voluntary exercise (that is, during an exercise attempt) even if the voluntary exercise is not actually performed. That is, such characteristic changes of the electroencephalogram can be activated if the corresponding brain region is activated by the intention of the subject 5 to perform the voluntary exercise, even though the voluntary movement is not actually performed. It can occur. Therefore, even for the subject 5 in a state in which voluntary exercise is impossible, the rehabilitation support system 100 can support voluntary exercise.
  • the electroencephalogram measurement system 10 detects, as a characteristic change, an intensity change of a specific frequency band that occurs in an electroencephalogram due to occurrence of event-related desynchronization (ERD).
  • the “event-related desynchronization” in the present disclosure means a phenomenon in which the power of a specific frequency band decreases in an electroencephalogram measured in the vicinity of the motor area during voluntary exercise (including recall of voluntary exercise).
  • “at the time of voluntary exercise” means a process from the intention of the subject 5 to voluntary exercise (recollection) to the success or failure of the voluntary exercise.
  • the "event-related desynchronization” can occur at the time of this voluntary movement, triggered by the intention (recollection) of the voluntary movement.
  • Frequency bands in which the power decreases due to event-related desynchronization are mainly ⁇ waves (for example, a frequency band of 8 Hz to less than 13 Hz) and ⁇ waves (for example, a frequency band of 13 Hz to less than 30 Hz).
  • the rehabilitation support system 100 having such a configuration, it is possible to realize effective rehabilitation by exercise therapy in the target person 5 while reducing the burden on the medical staff. Moreover, according to the rehabilitation support system 100, for example, there is no variation in the timing of assisting voluntary exercise due to human factors such as the skill of the medical staff who assists the voluntary exercise of the subject 5, and the variation of the effect of rehabilitation Is reduced. In particular, in the rehabilitation support system 100, the voluntary movement of the subject 5 can be assisted at the timing at which the characteristic change in the electroencephalogram (that is, the timing at which the brain region was actually activated). As described above, in the rehabilitation support system 100, since training can be performed according to the timing of brain activity, contribution to learning and establishment of correct brain activity can be expected. In particular, it is difficult for the subject 5 and the medical staff alone to determine whether or not a characteristic change has occurred in the electroencephalogram. Therefore, by using the rehabilitation support system 100, effective rehabilitation that is difficult to realize only by the target person 5 or the medical staff is possible.
  • the headset 1 includes a main body 15, a frame 17, and an electrode portion 11, as shown in FIGS. 3A and 3B.
  • the main body 15 is in the form of a box, and includes the signal processing unit 12, the communication unit 13, and the battery 14 inside (see FIG. 2).
  • the headset 1 is battery-powered, and power for operation of the signal processing unit 12 and the communication unit 13 is supplied from the battery 14.
  • the electrode unit 11 is an electrode for collecting the brain wave (brain wave signal) of the subject 5 and is, for example, a silver-silver chloride electrode.
  • the electrode unit 11 may be silver, gold, platinum or the like.
  • the electrode unit 11 has a first electrode 111 and a second electrode 112. As shown in FIG. 3B, the measurement point 51 set on the surface of the head 52 of the subject 5 includes a first measurement point 511 and a second measurement point 512.
  • the first electrode 111 is an electrode corresponding to the first measurement point 511, and is disposed on the first measurement point 511.
  • the second electrode 112 is an electrode corresponding to the second measurement point 512, and is disposed on the second measurement point 512.
  • the first measurement point 511 and the second measurement point 512 are located on the line connecting the center of the center of the head 52 and the point at which the front part of the right ear 522 is located.
  • the measurement points 511 and the second measurement points 512 are arranged in order. That is, in the present disclosure, each of the first electrode 111 and the second electrode 112 corresponds to a contact portion that causes the brain activity measurement device (headset 1) to contact the head 52 to measure brain activity (brain wave).
  • headset 1 causes the brain activity measurement device (headset 1) to contact the head 52 to measure brain activity (brain wave).
  • the electroencephalogram measurement system 10 measures an electroencephalogram collected from the vicinity of the motor area corresponding to the injury site that is the target of rehabilitation.
  • the motor area corresponding to the left finger is in the right brain of the subject 5, and the motor area corresponding to the right finger is in the left brain of the subject 5.
  • the electrode part 11 (the 1st electrode 111 and the 2nd electrode 112) made to contact the right side of the head 52 of the subject 5
  • the electroencephalogram that is generated is the measurement target in the electroencephalogram measurement system 10. That is, the electrode part 11 (the 1st electrode 111 and the 2nd electrode 112) is arrange
  • the electrode portion 11 (the first electrode 111 and the second electrode 112) is disposed at a position represented by the electrode symbol "C4" in the international 10-20 method.
  • the measurement site consisting of a part of the left surface of the head 52 of the subject 5, for example, the electrode symbol "C3" in the international 10-20 method
  • the electrode portion 11 (the first electrode 111 and the second electrode 112) is disposed at the position to be displayed.
  • the headset 1 further includes a reference electrode 113 and a ground electrode 114.
  • the reference electrode 113 is an electrode for measuring a reference potential of an electroencephalogram signal measured by each of the first electrode 111 and the second electrode 112.
  • the reference electrode 113 is disposed at a rear position of either the left ear 521 or the right ear 522 in the head 52. Specifically, the reference electrode 113 is disposed at the head 52 at a position behind the ear on which the first electrode 111 and the second electrode 112 are disposed. In the illustrated example, since the first electrode 111 and the second electrode 112 are disposed on the right surface of the head 52, the reference electrode 113 is disposed at the rear position of the right ear 522.
  • the ground electrode 114 is disposed at the rear of the left ear 521 or the right ear 522 of the head 52 where the reference electrode 113 is not disposed. Since the reference electrode 113 is disposed at the rear position of the right ear 522, the ground electrode 114 is disposed at the rear position of the left ear 521.
  • Each of the reference electrode 113 and the ground electrode 114 is electrically connected to the main body 15 of the headset 1 by the electric wire 16, and is attached to the surface (scalp) of the head 52.
  • the position where the reference electrode 113 and the ground electrode 114 are disposed may be the earlobe instead of the position behind the ear as described above.
  • the posterior position of the ear and the earlobe are places in the head that are less susceptible to biopotentials from brain activity. That is, it is preferable that the reference electrode 113 and the ground electrode 114 be disposed at a position on the head that is not easily influenced by bioelectric potential derived from brain activity.
  • the signal processing unit 12 is electrically connected to the electrode unit 11, and performs signal processing on an electroencephalogram signal (electric signal) input from the electrode unit 11 to generate electroencephalogram information.
  • the electroencephalogram signal includes a voltage signal which is a potential difference between the potential of the first electrode 111 and a potential of the reference electrode 113, and a voltage signal which is a potential difference between the potential of the second electrode 112 and a potential of the reference electrode 113.
  • the headset 1 measures the brain waves of the subject 5 by measuring the action potential of the brain of the subject 5 by the electrode unit 11, and generates the brain wave information representing the brain waves by the signal processing unit 12.
  • the signal processing unit 12 includes at least an amplifier for amplifying an electroencephalogram signal and an A / D converter for A / D conversion, and outputs an electroencephalogram signal in digital form after amplification as electroencephalogram information.
  • the communication unit 13 has a communication function with the information processing device 2.
  • the communication unit 13 transmits at least the electroencephalogram information generated by the signal processing unit 12 to the information processing device 2.
  • the communication unit 13 can communicate bi-directionally with the information processing apparatus 2.
  • the communication method of the communication unit 13 is, for example, wireless communication conforming to Bluetooth (registered trademark) or the like. From the communication unit 13, electroencephalogram information is transmitted to the information processing device 2 as needed.
  • the frame 17 is horseshoe-like (in other words, in the form of an Alice band). That is, the frame 17 has a shape extending in the first direction D1 from the center portion toward the left tragus and the right tragus in a state where the frame 17 is mounted on the head 52.
  • the frame 17 is configured of a strip-shaped metal plate long in the first direction, and a resin cover that covers at least a part of the metal plate.
  • the frame 17 is flexible. Therefore, by bending the frame 17, it is possible to widen the distance between both ends of the frame 17 in the first direction D1. Therefore, when attaching the frame 17 to the head 52, the head 52 is inserted between both ends of the frame 17 in the first direction D1 by appropriately bending the frame 17 according to the size of the head 52. Is possible.
  • a main body 15 is attached to a central portion of the frame 17 in the first direction D1.
  • the main body 15 is an opening for confirming whether the main body 15 is disposed at an appropriate position with respect to the central portion in the center.
  • the part 151 is provided.
  • the opening 151 penetrates the main body 15 in a direction intersecting (orthogonal to) both the first direction D1 and the second direction D2.
  • the main body 15 is disposed at a position where the central portion of the head 52 can be seen through the opening 151 of the main body 15. , The mounting position of the headset 1 can be adjusted.
  • Holding portions 18 are connected to both ends of the frame 17 in the first direction D1.
  • the holding portion 18 in the state where the frame 17 is attached to the head 52, the holding portion 18 is connected to one end on the left tragus side of the frame 17 and one end on the right tragus side.
  • the holding unit 18 is configured to be movable along the first direction D1 with respect to the frame 17. That is, the distance between the holding portion 18 and one end of the frame 17 in the first direction D1 is adjustable.
  • the holding portion 18 has a base portion 18A and a pad 18B as shown in FIG. 3B.
  • the base 18A and the pad 18B are both curved along the head 52 when the frame 17 is attached to the head 52.
  • the base 18A is in the form of a flat rectangular parallelepiped elongated in the second direction D2, and is connected to the frame 17.
  • One end of the base 18A in the second direction D2 (here, one end on the occipital node side of the head 52) has a dimension in the first direction D1 larger than that of the other portion of the base 18A.
  • the surface fastener is provided in the part which opposes the head 52 among the base 18A.
  • the pad 18B has a flat rectangular parallelepiped shape that is long in the second direction D2, and is attached to the base 18A.
  • the pad 18B is located between the base 18A and the head 52 and in contact with the head 52 with the frame 17 mounted on the head 52.
  • the pad 18B is made of, for example, a urethane resin, and has a hardness lower than that of the base 18A. Therefore, the pad 18B comes into contact with the head 52 when the frame 17 is attached to the head 52, so that the pad 18B sandwiched between the headset 1 and the head 52 is deformed, and the head from the headset 1 is Reduce the force on 52.
  • a surface fastener is attached to a part of the pad 18B facing the base 18A.
  • the pad 18B is attached to the base 18A by coupling the surface fastener of the pad 18B to the surface fastener 18D of the base 18A.
  • the pad 18B is removable from the base 18A.
  • the pair of hooking portions 184 are provided at both ends of the holding portion 18 in the second direction D2.
  • the hooking portion 184 is formed in a hook shape, and one end of the band is configured to be hooked.
  • the band has a long shape along the circumferential direction (second direction D2) of the head 52 and has elasticity.
  • the band is attached to the head 52 by hooking both ends thereof to hooks 184 on the forehead side and / or the occipital side of the pair of holding portions 18, respectively.
  • the headset 1 is firmly fixed by the head 52. For this reason, it can suppress that position shift of the headset 1 arises by the change of the attitude
  • the frame 17 is further provided with a pair of attachment portions 19.
  • the pair of attachment portions 19 are provided on both sides of the main body 15 in the first direction D1. At least one of the pair of attachment portions 19 has a first electrode 111 and a second electrode 112. In the present embodiment, the mounting portion 19 on the right ear 522 side of the subject 5 among the pair of mounting portions 19 has the first electrode 111 and the second electrode 112.
  • the mounting portion 19 has a base 190, a first case 191, a second case 192, and a handle 193.
  • the base 190 has a shape that sandwiches the frame 17 in the second direction D2.
  • the base 190 is configured to be movable in the first direction D1 along the frame 17. Therefore, by adjusting the position of the base 190 with respect to the frame 17 in the first direction D1, it is possible to adjust the position of the electrode portion 11 (the first electrode 111 and the second electrode 112) as a result.
  • the handle 193 is provided on the base 190.
  • the handle 193 is used to selectively switch between a state in which the base 190 is fixed relative to the frame 17 and a state in which the base 190 is movable relative to the frame 17. Specifically, by tightening the handle 193, the base 190 is fixed to the frame 17. By loosening the handle 193, the base 190 can be moved relative to the frame 17.
  • Each of the first case 191 and the second case 192 is a cylindrical body having an elliptical bottom.
  • the first case 191 has a first bottom (a bottom facing the head 52) attached to the base 190, and the first electrode 111 and the second electrode 112 are held therein.
  • Each of the first electrode 111 and the second electrode 112 has a first end (one end facing the head 52) protruding from the first case 191.
  • the first electrode 111 and the second electrode 112 are both configured to be movable relative to the first case 191 so that the amount of protrusion from the first case 191 can be changed.
  • a coil spring is accommodated in the first case 191.
  • the coil spring is disposed between the second ends of the first electrode 111 and the second electrode 112 and the second bottom of the first case 191 (the bottom opposite to the first bottom). One end of the coil spring is fixed to the bottom of the first case 191.
  • the second case 192 has an open first end (one end facing the head 52), and the outer shape when viewed in the normal direction of the surface (scalp) of the head 52 is larger than that of the first case 191 .
  • the second case 192 is combined with the first case 191 so as to store a part of the first case 191 inside through the opening.
  • the second case 192 is configured to be movable relative to the first case 191 between the first position and the second position in the direction in which the coil spring expands and contracts. In the first position, the amount of projection of the first case 191 from the second case 192 is the smallest, and in the second position, the amount of projection of the first case 191 from the second case 192 is the largest.
  • the first end of the shaft passing through the second bottom of the first case 191 is fixed to the inner bottom of the second end of the second case 192 (the end opposite to the first end).
  • the second end of the shaft is fixed to the first electrode 111 and the second electrode 112. Therefore, by moving the second case 192 between the first position and the second position with respect to the first case 191, the first electrode 111 and the second electrode 112 are moved along with the movement of the second case 192 and the shaft. Move too. That is, by moving the second case 192 with respect to the first case 191, it is possible to adjust the amount of projection of the first electrode 111 and the second electrode 112 from the first case 191.
  • the second case 192 is configured to be movable in the second direction D2 with respect to the first case 191 at the second position. Then, the first end of the second case 192 is hooked on the second bottom of the first case 191 by moving the second case 192 in the second direction D2 at the second position.
  • the first electrode 111 and the second electrode 112 move to the inside of the first case 191.
  • the coil spring is compressed. Then, when the pulling force of the second case 192 is released, the first electrode 111 and the second electrode 112 return to the original state by the elastic force of the coil spring.
  • each of the first electrode 111 and the second electrode 112 When the headset 1 is attached to the head 52 of the subject 5, each of the first electrode 111 and the second electrode 112 is pushed by the head 52 and maintained in the state of being moved to the inside of the first case 191. Ru. That is, each of the first electrode 111 and the second electrode 112 pushes the measurement point 51 of the head 52 by the elastic force of the compressed coil spring.
  • the first electrode 111 and the second electrode 112 be in close contact with the scalp (measurement location 51). Therefore, in the headset 1, the adhesion between the first electrode 111 and the second electrode 112 and the scalp is enhanced by pressing the first electrode 111 and the second electrode 112 against the scalp by the elastic force of the coil spring.
  • the brain activity measuring apparatus headset 1
  • brain activity electroencephalogram (electroencephalogram) is suppressed while suppressing redness by members (first electrode 111 and second electrode 112) brought into contact with the scalp to measure brain activity (electroencephalogram). It is desirable to improve the measurement accuracy of
  • the evaluation system 105 of the present embodiment indirectly measures the load applied to the head 52 of the subject 5 by the first electrode 111 and the second electrode 112 of the headset 1, and the range of the measured value of the load is appropriate. It is judged (evaluated) whether it is within
  • the evaluation system 105 of the present embodiment will be described in detail with reference to FIGS. 4 to 12.
  • the evaluation system 105 is provided on a body (head model 6) to which a brain activity measurement apparatus (headset 1) can be attached, and the head model 6 to convert loads into electrical signals 1 And three or more transducers 7.
  • the evaluation system 105 further includes an evaluation device 8.
  • the evaluation device 8 evaluates the magnitude of the load by comparing the magnitude of the load obtained from the information of the load included in the electrical signal with the reference value for evaluation.
  • the converter 7 includes a first converter 7A and a second converter 7B.
  • the transducer 7 is composed of a load cell using a strain gauge.
  • the converter 7 includes a cylindrical main body 70 and a cable 71 drawn from the side of the main body 70.
  • a protrusion 72 is provided at the center of the first bottom surface of the main body 70 (see FIG. 7).
  • the main body portion 70 accommodates four strain gauges 73A to 73D and strain generating portions that cause the strain gauges 73A to 73D to be strained by the load applied to the protrusions 72 (see FIG. 5).
  • Each of the four strain gauges 73A to 73D accommodated in the main body 70 is disposed one by one on the corresponding one of the four sides of the Wheatstone bridge circuit as shown in FIG.
  • the cable 71 has four electric wires including two electric wires 711 and 712 for input and two electric wires 713 and 714 for output. Electrical wire 711 of positive polarity for input is electrically connected with the connection point of two strain gauges 73A, 73B, electrical wire 712 of negative polarity for input is electrically connected with the connection point of two strain gauges 73C, 73D It is done.
  • Electrical wire 713 for positive polarity of output is electrically connected to the connection point of two strain gauges 73B and 73C
  • electrical wire 714 for negative polarity for output is electrically connected to the connection point of two strain gauges 73D and 73A It is done.
  • the evaluation device 8 includes a power supply circuit 80, a signal processing circuit 81, and a microcontroller 82.
  • the feed circuit 80 converts, for example, an AC voltage supplied from a power system (commercial AC power supply) into a DC constant voltage, and the constant voltage (DC voltage) V1 is connected via the two electric wires 711 and 712.
  • the converter 7 (the first converter 7A or the second converter 7B) is fed (see FIG. 5).
  • the signal processing circuit 81 amplifies the electric signal (voltage signal) V2 output from each converter 7 (the first converter 7A or the second converter 7B) through the two electric wires 713 and 714, and And an AD converter circuit that AD-converts the electric signal amplified by the amplifier circuit.
  • the AD conversion circuit inputs the converted digital signal to the input port of the microcontroller 82.
  • the electric signal V2 output from the converter 7 has a voltage value corresponding to the amount of strain generated in each of the strain gauges 73A to 73D by the load applied to the converter 7. That is, it is possible to obtain the size (unit: Newton) of the load applied to the converter 7 from the voltage value of the electric signal V2.
  • the microcontroller 82 is configured as a semiconductor integrated circuit in which a processor, a memory, a peripheral device, and the like are integrated into one chip.
  • the microcontroller 82 can perform various processes by causing the processor to execute a program stored in the memory.
  • Peripheral devices include an input port for signal input, an output port for signal output, and a timer.
  • the AD conversion circuit of the microcontroller 82 converts the electric signal (a signal obtained by amplifying the electric signal V2 by the amplification circuit) into AD conversion. You may The processing executed by the microcontroller 82 will be described later.
  • the head model 6 has a lower head 60 having a substantially elliptic cylindrical shape, and an upper head 61 mounted on the upper bottom surface of the lower head 60.
  • the upper head portion 61 is formed in a dome shape (more specifically, a semi-elliptical shape) which is a shape simulating a human head.
  • the lower head 60 and the upper head 61 are preferably integrally formed of a material such as a synthetic resin which is easy to mold.
  • the dimensions of each part of the head model 6 are, for example, published in "Japanese body size data book 2004-2006 (Japanese body size data book 2004-2006) publisher: Human life engineering research center". Preferably, it is calculated from dimensional data of a Japanese head.
  • head models there are three head models: a large size head model 6, a medium size head model 6, and a small size head model 6. 6 is used.
  • head length S1 see FIG. 8B
  • head width S2 see FIG. 8B
  • tragus interval S3 see FIG. 8A
  • total head height S4 see FIG. 8C
  • interfollicular apex arc length S5 see FIG. 8A
  • Table 1 the value of each dimension of S1 to S5 shown in Table 1 is only an example, and it is preferable that it is suitably changed according to various conditions such as race, age, and gender.
  • a circular first mark 610 is drawn at a position corresponding to the central portion of a person (see FIGS. 6 and 8B).
  • circular second marks 600 are marked at respective positions corresponding to the left and right tragus of a person (see FIGS. 6 and 8C).
  • the first mark 610 and the second mark 600 serve as marks when the head set 1 is attached to the head model 6 as described later.
  • both the first mark 610 and the second mark 600 are necessarily written on the head model 6. It does not have to be
  • the first curve W1 to be passed is rotationally symmetric (2-fold symmetry) with respect to the position corresponding to the central portion (see FIG. 10A).
  • the first curve W1 coincides with the trabecular arc of the tragus.
  • the second curve W2 orthogonal to the first curve W1 through the position corresponding to the central center portion is rotationally symmetric (two-fold symmetry) about the position corresponding to the central center portion ) (See FIG. 10B).
  • the manufacturing cost of the head model 6 (mainly the manufacturing cost of the mold) can be reduced.
  • each recess 62 is provided in each portion between the first mark 610 and the two second marks 600 (see FIG. 7). These two recesses 62 are formed in the same shape and in the same dimensions (however, only one recess 62 is shown in FIG. 7).
  • the bottom surface of each recess 62 is a flat surface having the shape of a quadrilateral (a so-called rounded quadrilateral) having four rounded corners.
  • the bottom surface of each recess 62 is provided with a plurality of support protrusions 620 for supporting each of the two transducers 7 (the first transducer 7A and the second transducer 7B). However, in FIG. 7, only the four support protrusions 620 for supporting the first transducer 7A are illustrated, and the four support protrusions for supporting the second transducer 7B are hidden by the load receiving seat 64 (described later). .
  • Each of the four support protrusions 620 supporting the first transducer 7A is formed in an arc and protrudes from the bottom of the recess 62 so as to be equally spaced.
  • the second converter 7B is also inserted into and supported by the space surrounded by the four support protrusions in the same manner as the first converter 7A.
  • the cables 71 of the transducers 7 (the first transducer 7A and the second transducer 7B) are drawn out of the recesses 62 from the respective lead-out grooves 621 so that the bottom surface of the recesses 62 can be covered.
  • the main body 70 of the transducer 7 (the first transducer 7A and the second transducer 7B) is covered by the load receiving seat 64.
  • the load receiving seat 64 has a main portion 640 and a collar portion 641 as shown in FIGS. 10A to 10D.
  • the main portion 640 and the flange portion 641 are preferably integrally formed of a synthetic resin material.
  • the main portion 640 is formed in a prismatic shape having a rounded first bottom surface 6401 and a second bottom surface 6402. Although the second bottom surface 6402 is a flat surface, the first bottom surface 6401 is a curved surface that is convex in a direction away from the second bottom surface 6402.
  • the normal direction D3 of the first bottom surface 6401 is inclined with respect to the normal direction D4 of the second bottom surface 6402 (see FIG. 10D). Note that the arrows “D3” and “D4” shown in FIG. 10D are only shown for the sake of explanation, and do not have an entity.
  • a circular interlocking recess 642 is provided at the center of the second bottom surface 6402 of the main portion 640.
  • the main body portion 70 of the transducer 7 is fitted into the engagement recess 642 (see FIG. 11).
  • a circular recess 643 is provided at the center of the bottom surface of the engagement recess 642.
  • the projections 72 of the transducer 7 fit into the recesses 643 (see FIG. 11).
  • the second bottom surface 6402 is provided with a semi-cylindrical groove 644 extending from the edge of the interlocking recess 642 to the edge of the ridge 641 (see FIG. 10C).
  • the cable 71 of the converter 7 is passed through the groove 644.
  • the head model 6 has two covers 63 which close each of the two recesses 62 as shown in FIGS. 6 and 7. However, in FIG.6 and FIG.7, only one cover 63 corresponding to one recess 62 is shown in figure.
  • the shape of the cover 63 as viewed in the thickness direction is the same rounded square as the bottom of the recess 62.
  • the back surface of the cover 63 (the surface facing the bottom surface of the recess 62) is flat as in the bottom surface of the recess 62 (see FIG. 11).
  • the surface of the cover 63 (the surface exposed to the surface of the upper head 61) is formed in the same curved surface (surface of the ellipsoid) as the surface of the upper head 61 (see FIGS. 8A and 8B).
  • the cover 63 has two through holes (a first through hole 630A and a second through hole 630B) penetrating in the thickness direction of the cover 63.
  • an accommodation recess 631 is provided on the back surface of the cover 63.
  • These two through holes (a first through hole 630A and a second through hole 630B) have an opening at the bottom of the housing recess 631.
  • the housing recess 631 receives the first transducer 7A, the second transducer 7B, and the two load receiving seats 64 (see FIG. 11). Each of the two load receiving seats 64 is fitted into the main body 70 of each of the first transducer 7A and the second transducer 7B.
  • each load receiving seat 64 is passed through one of the facing through holes of the through holes (the first through holes 630A and the second through holes 630B) opened in the bottom surface of the housing recess 631. . Furthermore, the main portion 640 of each load receiving seat 64 is displaceably supported by the cover 63 along the thickness direction of the cover 63 (the same direction as the arrow D4 in FIG. 10D) (see FIG. 11).
  • Each screw insertion hole 633 penetrates the cover 63 in the thickness direction.
  • the cover 63 is a screw fixing hole corresponding to one of the screw fixing holes 622 in which each of the fixing screws 65 inserted one by one into each screw insertion hole 633 is provided at four corners of the bottom surface of the recess 62. It is fixed to the upper head 61 by being screwed into 622 (see FIG. 6).
  • a pair of notches On one side of the cover 63, a pair of notches (a first notch 632A and a second notch 632B) are provided.
  • the first notch 632A and the second notch 632B are connected to the receiving recess 631 on the back surface of the cover 63. Then, the cable 71 of the first converter 7A is drawn out of the recess 62 from the space (hole) surrounded by the first notch 632A of the cover 63 and one of the lead grooves 621 of the recess 62. Similarly, the cable 71 of the second converter 7B is drawn out of the recess 62 from the space (hole) surrounded by the second notch 632B of the cover 63 and the other lead-out groove 621 of the recess 62.
  • each of the main parts 640 of the two load receiving seats 64 is exposed to the surface of the cover 63 through the corresponding one of the first through holes 630A and 630B of the first through holes 630A and the second through holes 630B of the cover 63. (See Figure 6). Then, when a load in the direction from the load receiving seat 64 to the converter 7 is applied to (the main portion 640 of) the load receiving seat 64, the load receiving seat 64 is a through hole of the cover 63 (first through hole 630 A and second The inside of the through hole 630B) is displaced in the direction approaching the transducer 7. Then, the main portion 640 of the load receiving seat 64 pushes the projection 72 of the transducer 7 toward the main body portion 70.
  • the converter 7 converts a component (load) parallel to the direction D5 in the load applied to the load receiving seat 64 into the electric signal V2, and causes the cable 71 (two electric wires 713 and 714) to conduct electricity.
  • a signal V2 can be output.
  • the arrow of "D5" shown in FIG. 11 is only described for description, It does not have an entity.
  • a person who performs evaluation of the headset 1 mounts the frame 17 of the headset 1 on the upper head 61 of the head model 6 of any size (for example, S size) Do.
  • the evaluator adjusts the mounting position of the frame 17 with respect to the upper head 61 so that the first mark 610 of the head model 6 can be visually recognized through the opening 151 of the main body 15. It can be mounted at an appropriate position of the model 6.
  • the evaluator moves each of the pair of left and right mounting portions 19 with respect to the frame 17 so that each of the first electrode 111 and the second electrode 112 of each mounting portion 19 corresponds to the main portion of the corresponding load receiving seat 64.
  • Contact the surface of 640 see FIG. 12).
  • a load is applied to each load receiving seat 64 from the first electrode 111 and the second electrode 112.
  • the evaluator electrically connects the two electric wires 711 and 712 of the cable 71 of the first converter 7A and the cable 71 of the second converter 7B to the feeding circuit 80 of the evaluation device 8. Furthermore, the evaluator electrically connects two wires 713 and 714 of the cable 71 of the first converter 7A and the cable 71 of the second converter 7B to the signal processing circuit 81 of the evaluation device 8. Then, the evaluator causes the microcontroller 82 of the evaluation device 8 to execute a program for evaluation (the program of the present embodiment). The microcontroller 82 performs processing for evaluating the load applied to the head 52 from the first electrode 111 and the second electrode 112 of the headset 1 in accordance with a program for evaluation. The microcontroller 82 preferably reads and executes an evaluation program recorded in a non-temporary recording medium such as a semiconductor memory, a magnetic disk, and an optical disk.
  • a non-temporary recording medium such as a semiconductor memory, a magnetic disk, and an optical
  • the microcontroller 82 rearranges the N arrays L (1) to L (N) in ascending order according to the size of the variables (data) if the subscript i is equal to or larger than the specified value N (Step 5) .
  • the microcontroller 82 selects N / 2 arrays L (i) excluding N / 4 at the head and N / 4 at the rear from the N arrays L (1) to L (N) sorted in ascending order. Calculate the arithmetic mean LM of, ... (Step 6).
  • the microcontroller 82 compares the arithmetic mean LM with the reference value TH (Step 7).
  • the reference value TH is intended to improve the measurement accuracy of the brain activity (electroencephalogram) of the subject 5 while suppressing the reddening that occurs in the measurement location 51 of the subject 5 based on the results of the test conducted in advance. It is preferably set to a possible value.
  • the reference value TH in the present embodiment is less than 1 N (newton) in terms of the magnitude of the load applied from the electrode portion 11 (the first electrode 111 and the second electrode 112) to the measurement location 51 of the subject 5. Value (preferably 0.9 N).
  • the reference value TH is stored in the memory of the microcontroller 82.
  • the microcontroller 82 determines that the magnitude of the load of the electrode unit 11 is good (determination result is OK) (Step 8). If the arithmetic mean LM is equal to or greater than the reference value TH, the microcontroller 82 determines that the magnitude of the load of the electrode unit 11 is defective (determination result NG) (Step 9).
  • the microcontroller 82 notifies the evaluator of the determination result (evaluation result) of the arithmetic mean LM. For example, the microcontroller 82 notifies the evaluator of the evaluation result by displaying the evaluation result on a display device such as a liquid crystal display provided in the evaluation device 8. Alternatively, the microcontroller 82 may drive a speaker or a buzzer provided in the evaluation device 8 and notify the evaluator of the evaluation result by a sound (voice message or buzzer).
  • the evaluator can determine whether the load of the electrode unit 11 in the headset 1 to be evaluated is good (pass or fail) based on the evaluation result notified from the evaluation device 8. In addition, when an evaluator determines with rejection, it is desirable that design changes, such as a change of the spring constant of a coiled spring, are performed with respect to the headset 1 of evaluation object.
  • the operation of the evaluation system described above is merely an example.
  • the evaluation device 8 (micro controller 82) performs the final evaluation of the headset 1, the evaluation device 8 notifies the evaluator of the magnitude of the load measured by the converter 7, and the notification is sent to the notification. Based on the evaluation, the evaluator may make a final evaluation of the headset 1.
  • an acquisition unit (a device having the same configuration as the evaluation device 8) for acquiring information (load magnitude) of the load included in the electric signal V2 by signal processing the electric signal V2 output from the converter 7 is provided. It may be built in the head model 6.
  • the head set 1 configured to measure an electroencephalogram by an electroencephalogram electrode (electrode unit 11) in contact with the head 52 is illustrated as the brain activity measurement device to be evaluated.
  • the brain activity measuring device is not limited to the headset 1.
  • the evaluation system 105 of this embodiment may set, for example, a functional near-infrared spectrometer as an evaluation target as a brain activity measurement apparatus other than the headset 1.
  • the functional near-infrared spectroscopy device includes a light-emitting device that emits near-infrared light, and a photoelectric conversion device that receives near-infrared light and converts the light into an electrical signal.
  • a functional near infrared spectroscopy device brings a light emitting device and a photoelectric conversion device into contact with the scalp, emits near infrared light of the light emitting device into the brain, and reflects near infrared light (reflected light) reflected on the brain surface of the cerebral cortex
  • the blood flow state (brain activity) of the brain surface of the cerebral cortex is measured by photoelectrically converting the That is, in the functional near infrared spectroscopy device, the light emitting device and the photoelectric conversion device correspond to the contact portion, and the evaluation system 105 may evaluate the pressing force (load) applied to the scalp by the light emitting device and the photoelectric conversion device. .
  • FIG. 14 shows an example of the system configuration of an evaluation system 106 for evaluating the electrical characteristics of the electrode unit 11 of the headset 1 using the head model 6 in the evaluation system of this embodiment.
  • the evaluation system 106 includes a multi-function generator 107 and a simulated electroencephalogram generation circuit 108.
  • the multi-function generator 107 is configured to generate a reference voltage having an arbitrary frequency in a frequency range of, for example, 1 Hz or less to several tens of Hz.
  • 9 Hz is a frequency band of ⁇ waves
  • 18 Hz is a frequency band of ⁇ waves. That is, the waveforms of the two types of reference voltages generated by the multi-function generator 107 simulate the waveforms of two types of brain waves ( ⁇ wave and ⁇ wave).
  • the simulated electroencephalogram generation circuit 108 includes an attenuator 1080 and two impedance units (a first impedance unit 1081 and a second impedance unit 1082).
  • the attenuator 1080 is configured to reduce (attenuate) the amplitude of the reference voltage while maintaining the frequency of the reference voltage supplied from the multi-function generator 107.
  • Attenuator 1080 has four signal lines 1083-1086. Each of the two signal lines 1083 and 1084 of the four signal lines 1083 to 1086 is electrically connected to the corresponding electrode plate 66 of the two electrode plates 66 one by one.
  • the electrode plate 66 is preferably provided on the main portion 640 of the load receiving seat 64 of the head model 6 as shown in FIG.
  • the electrode plate 66 is made of, for example, a metal plate, and is insert-molded in the main portion 640 so that one surface is exposed on the surface of the main portion 640. That is, the first electrode 111 and the second electrode 112 of the electrode unit 11 are included in the electrode plate 66 of each load receiving seat 64 attached to the main body 70 of each of the first transducer 7A and the second transducer 7B. Conducts contact with the corresponding electrode plate 66.
  • each of the remaining two signal lines 1085 and 1086 of the four signal lines 1083 to 1086 are electrically connected to corresponding ones of the two terminal portions 67 and 68 one by one.
  • Ru Each of the terminal portions 67 and 68 has, for example, an alligator clip, and is electrically connected to a corresponding one of the reference electrode 113 and the ground electrode 114 through the alligator clip.
  • the first impedance section 1081 has two resistors. One of the two resistors is electrically connected in series to the signal line 1083 and an electrode plate 66 in contact with the first electrode 111. The remaining one of the two resistors is electrically connected in series to the signal line 1084 and an electrode plate 66 in contact with the second electrode 112. It is preferable that the resistance value of the two resistors of the first impedance portion 1081 be approximately equal to the resistance value of the contact resistance between the human scalp and the electrode portion 11.
  • the second impedance section 1082 has two resistors. One of the two resistors is electrically connected in series to the signal line 1085 and one of the terminal portions 67. The remaining one of the two resistors is electrically connected in series to the signal line 1086 and the other terminal 68.
  • the resistances of the two resistors of the second impedance section 1082 are preferably approximately equal to the resistance of the contact resistance between the human scalp and the reference electrode 113 and the ground electrode 114.
  • the evaluator causes the multi function generator 107 to supply the reference voltage of the predetermined evaluation pattern to the simulated electroencephalogram generation circuit 108 while performing the evaluation of the pressing force of the electrode unit 11 described above.
  • the evaluation pattern includes, for example, a waveform pattern in which the amplitude of a reference voltage simulating an alpha wave is increased or decreased every predetermined time (for example, 5 seconds), and the amplitude of a reference voltage simulating a beta wave as a fixed time (for example, It is a waveform pattern etc. which increased / decreased every 5 seconds. That is, the multi-function generator 107 supplies the reference voltage simulating the electroencephalogram when the event related desynchronization (ERD) occurs to the pseudo electroencephalogram generating circuit 108.
  • ERP event related desynchronization
  • the simulated electroencephalogram generation circuit 108 adjusts (attenuates) the reference voltage supplied from the multi-function generator 107 and attenuates the electrode portion 11 of the headset 1 through the two electrode plates 66 and the two terminal portions 67 and 68, It outputs to the reference electrode 113 and the earth electrode 114. That is, pseudo brain waves are supplied to the electrode unit 11 of the headset 1 through the electrode plate 66 of the head model 6.
  • the headset 1 transmits brain wave information of a simulated brain wave to the information processing device 2.
  • the information processing device 2 causes the display device of the computer system to display electroencephalogram information (for example, an electroencephalogram waveform) of the simulated electroencephalogram received from the headset 1.
  • the evaluator may evaluate the electrical characteristics of the electrode unit 11 based on whether or not a change corresponding to the evaluation pattern appears in the electroencephalogram waveform of the electroencephalogram information based on the electroencephalogram information displayed on the display device. it can. When the evaluator determines (evaluates) that the electrical characteristics of the electrode portion 11 are rejected (investigate), it is desirable that investigation and improvement be performed on the cause of the rejection with respect to the headset 1 to be evaluated. .
  • the evaluation of the electrical characteristics of the electrode portion 11 may be performed before or after the evaluation of the load of the electrode portion 11.
  • the evaluator can perform the work of evaluating the load on the electrode unit 11 and the evaluation of the electrical characteristics simultaneously or continuously. As a result, the evaluation system 106 can reduce the workload of the evaluator.
  • the evaluation system (105) of the brain activity measurement apparatus (headset 1) is the head of the subject (5) in order to measure brain activity of the subject (5).
  • the brain activity measurement apparatus having the contact portion (electrode portion 11) to be brought into contact with the portion includes the main body (head model 6) which can be mounted in the state where the contact portion is in contact.
  • the evaluation system (105) of the brain activity measurement device according to the first aspect includes a converter (7) provided on the main body to convert a load into an electrical signal.
  • the transducer (7) is disposed at a portion of the main body that receives the load from the contact portion in a state where the brain activity measurement device is attached to the main body.
  • the evaluation system (105) converts the load received from the contact portion into an electric signal by the converter (7) provided in the main body, the magnitude of the load received from the contact portion is an electronic circuit (computer Easier to handle with the system). Therefore, the evaluation system (105) of the brain activity measurement device according to the first aspect can simply and appropriately evaluate the load applied to the head (52) of the subject (5) from the brain activity measurement device.
  • the evaluation system (105) according to the second aspect of the present disclosure can be realized by a combination with the first aspect.
  • the load receiving seat (64) is disposed between the transducer (7) and the contact portion and applies a load received from the contact portion to the transducer (7).
  • the surface of the load receiving seat (64) in contact with the contact portion is formed in a curved shape that is convex in the direction approaching the contact portion.
  • the evaluation system (105) according to the second aspect can make the surface of the load receiving seat (64), which is a surface receiving a load from the contact portion, a shape close to the surface of the actual head (52) .
  • the evaluation system (105) according to the second aspect can improve the measurement accuracy of the load received from the contact portion.
  • the evaluation system (105) according to the third aspect of the present disclosure can be realized by a combination with the first or second aspect.
  • the evaluation system (105) according to the third aspect preferably includes a plurality of transducers (7).
  • Each of the plurality of transducers (the first transducer 7A and the second transducer 7B) has corresponding ones of the plurality of contact portions (the first electrode 111 and the second electrode 112) of the brain activity measuring device in the main body. It is preferable to arrange
  • the loads of the plurality of contact portions are individually divided by the plurality of transducers (the first transducer 7A, the second transducer 7B) Can be converted into electrical signals.
  • the evaluation system (105) according to the third aspect can shorten the time required for evaluation as compared to the case where the loads of the plurality of contact portions are converted into an electrical signal by one converter. .
  • the evaluation system (105) according to the fourth aspect of the present disclosure can be realized by combination with any one of the first to third aspects.
  • the transducer (7) is configured to convert load in a direction parallel to at least the direction in which the contact portion applies a load to the head into an electrical signal. preferable.
  • the evaluation system according to the fourth aspect can improve the reliability of evaluation by more accurately measuring the load from the contact portion.
  • the evaluation system (105) according to the fifth aspect of the present disclosure can be realized by combination with any one of the first to fourth aspects.
  • the position corresponding to the central center of the subject (5) and the tragus of the subject (5) in a part including the body part (upper head 61) It is preferable that a mark (a first mark 610, a second mark 600) be provided at at least one of the corresponding positions.
  • the evaluation system (105) can mount the brain activity measurement device at an appropriate position of the main body using the marks (first mark 610, second mark 600).
  • the evaluation system (105) according to the sixth aspect of the present disclosure can be realized by combination with any one of the first to fifth aspects.
  • the position corresponding to the central center of the subject (5) and the position corresponding to the tragus on both sides of the subject (5) It is preferable that the first curve (W1) to be passed is rotationally symmetrical about a position corresponding to the central portion.
  • a second curve (W2) orthogonal to the first curve (W1) through a position corresponding to the midline center in a part including the portion of the main body is rotated about the position corresponding to the midline center Preferably, it is symmetrical.
  • the evaluation system (105) according to the sixth aspect can reduce the manufacturing cost of the main body as compared with the case where the part including the portion of the main body is not symmetrical.
  • the evaluation system (105) according to the seventh aspect of the present disclosure can be realized by combination with any one of the first to sixth aspects.
  • the evaluation system (105) according to the seventh aspect further includes an acquisition unit (signal processing circuit 81) that performs signal processing on the electrical signal output from the converter (7) to acquire information on a load included in the electrical signal. It is preferable to have.
  • the evaluation system (105) according to the seventh aspect can omit the wiring work between the converter (7) and the acquisition unit (signal processing circuit 81).
  • the evaluation system (105) according to the eighth aspect of the present disclosure can be realized by combination with any one of the first to seventh aspects.
  • an evaluation device (8) for evaluating the size of a load by comparing the size of the load obtained from the information of the load included in the electrical signal with a reference value for evaluation.
  • the evaluation system (105) according to the eighth aspect can reduce the burden on the evaluator performing the evaluation work by including the evaluation device (8).
  • the evaluation system (106) according to the ninth aspect of the present disclosure can be realized by combination with any one of the first to eighth aspects.
  • the evaluation system (106) according to the ninth aspect preferably further includes a generation unit (electrode plate 66) that artificially generates a signal detected by the contact unit to measure brain activity.
  • the generator is preferably disposed at a portion of the main body at which the transducer (7) is disposed, and generates a signal in a pseudo manner in a state where the transducer (7) receives a load from the contact portion.
  • the evaluation system (106) can evaluate the electrical characteristics of the contact portion as well as the load of the contact portion.
  • a brain activity measurement device measures brain activity by using a transducer (7) provided on a main body mountable to the brain activity measurement device. It arranges at the part which receives load from the contact part which contacts the head. Furthermore, in the evaluation method according to the tenth aspect, the load that the portion receives from the contact portion is converted into an electrical signal by the converter (7).
  • the evaluation method according to the tenth aspect can easily and appropriately evaluate the load applied to the head (52) of the subject (5) from the brain activity measurement device.
  • the evaluation method according to the eleventh aspect of the present disclosure can be realized by a combination with the tenth aspect.
  • it is preferable to evaluate the magnitude of the load by comparing the magnitude of the load obtained from the information of the load included in the electrical signal with a reference value for evaluation.
  • the evaluation method according to the eleventh aspect can easily evaluate the load applied to the head (52) of the subject (5) from the brain activity measurement device.
  • a program according to a twelfth aspect of the present disclosure causes a computer system (microcontroller 82) to execute a method of evaluating a brain activity measurement device.
  • the program according to the twelfth aspect can easily and appropriately evaluate the load applied to the head (52) of the subject (5) from the brain activity measuring device.
  • a non-transitory recording medium is read by a computer system that records a program for causing a computer system to execute the method of evaluating a brain activity measuring device according to the tenth or eleventh aspect. It is a possible non-transitory recording medium.
  • the non-temporary recording medium according to the thirteenth aspect can easily and appropriately evaluate the load applied to the head (52) of the subject (5) from the brain activity measuring device.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
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  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Psychiatry (AREA)
  • Psychology (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

La présente invention aborde le problème de l'évaluation facile et appropriée d'une charge placée sur la tête d'un sujet à partir d'un dispositif de mesure d'activité cérébrale. Un système d'évaluation (105) comprend : une forme de tête (6) à laquelle un casque (1) peut être monté; et un convertisseur (7) pour convertir une charge en un signal électrique, le convertisseur (7) étant fourni à la forme de tête (6). Le convertisseur (7) est disposé dans la forme de tête (6) dans une partie de celui-ci qui reçoit une charge provenant d'une partie d'électrode (11) placée en contact avec le cuir chevelu afin que le casque (1) mesure l'activité cérébrale.
PCT/JP2018/038930 2017-10-20 2018-10-19 Système d'évaluation, procédé d'évaluation, programme et support d'enregistrement non temporaire pour dispositif de mesure d'activité cérébrale WO2019078326A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022145176A1 (fr) * 2020-12-28 2022-07-07 国立研究開発法人産業技術総合研究所 Dispositif de mesure de fonction cérébrale et procédé de mesure de fonction cérébrale

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05277080A (ja) * 1992-04-01 1993-10-26 Dia Medical Syst Kk 生体電気現象検出装置
JPH0759738A (ja) * 1993-08-26 1995-03-07 Nec Corp 生体情報ノイズ除去装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05277080A (ja) * 1992-04-01 1993-10-26 Dia Medical Syst Kk 生体電気現象検出装置
JPH0759738A (ja) * 1993-08-26 1995-03-07 Nec Corp 生体情報ノイズ除去装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022145176A1 (fr) * 2020-12-28 2022-07-07 国立研究開発法人産業技術総合研究所 Dispositif de mesure de fonction cérébrale et procédé de mesure de fonction cérébrale
JP7503338B2 (ja) 2020-12-28 2024-06-20 国立研究開発法人産業技術総合研究所 脳機能計測装置及び脳機能計測方法

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JPWO2019078326A1 (ja) 2020-11-05

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