JP6927632B2 - Electrodes for EEG measurement - Google Patents

Description

The present invention relates to an electrode for measuring electroencephalogram.

As the conventional electroencephalogram measurement electrode, a type in which a conductive paste is interposed between the subject's scalp and the electrode is often used. The conductive paste has the effect of fixing the position of the measurement site in addition to reducing the contact impedance between the scalp and the electrodes, but it requires removal after measurement, which complicates the work. ..

Therefore, in recent years, an electrode (dry electrode) capable of ensuring a low contact impedance without using a conductive paste has been developed. As the dry electrode, for example, a multi-pin type dry electrode used by attaching to a hair band (for example, Non-Patent Document 1) and a multi-pin type dry electrode used by attaching to a head cap (for example, Non-Patent Document 2) have been proposed. ing. In these dry electrodes, the multi-pin is made of a hard metal.

Further, in order to reduce the burden on the subject, an electroencephalogram measurement electrode (for example, Patent Document 1) in which a contact portion made of metal is provided at the tip of a protruding portion made of rubber, or a metal spring is used to make the metal. An electroencephalogram measuring electrode having a spherical tip that can be expanded / contracted, swung, and swiveled has been proposed (for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2013-111361 Japanese Unexamined Patent Publication No. 2013-240485

Manabu Honda, Strategic Creative Research Promotion Project CREST, Research Area "Advanced Integrated Sensing Technology", Research Project "Wearable Core Brain Function Integrated Sensing System to Create a Safe Information Environment for the Brain" g-tec active dry electrode "g.SAHARA", Internet <URL: http://www.gtec.at/Products/Electrodes-and-Sensors/g.SAHARA-Specs-Features>

However, since the multi-pins of the electrodes of Non-Patent Documents 1 and 2 are made of a hard metal, there is a problem that the subject feels uncomfortable and the burden on the scalp is large.

In the electrode of Patent Document 1, since a large amount of conductive material is blended in order to impart desired conductivity to the protruding portion made of rubber, the original flexibility and cushioning property of rubber are lowered and the electrode becomes hard. The hard protrusion leads to pain of the subject when it comes into contact with the scalp, and moreover, the adhesion to the scalp is poor, which makes it difficult to accurately measure the brain wave. Further, when an expensive conductive material is used, the manufacturing cost cannot be suppressed.

In the electrode of Patent Document 2, due to the complexity of the structure, poor continuity may occur at the contact point, and the electroencephalogram measurement may not be performed well. Moreover, since the structure is complicated, the manufacturing cost is high and it is not suitable for mass production.

When measuring an electroencephalogram with a conventional electrode for measuring an electroencephalogram, the hair becomes an obstacle and the resistance value rises. For this reason, accurate results cannot be obtained in the hair area. If the contact between the scalp contact portion of the electrode and the mounted area of the head is poor, it becomes difficult to obtain an accurate measurement result. In order to improve the accuracy of EEG measurement, there is a need for electrodes that can reliably contact and adhere to any region of the head.

Therefore, an object of the present invention is to provide an electroencephalogram measurement electrode capable of contacting the scalp without using a conductive paste to sufficiently secure continuity, reducing the burden on the subject, and measuring the electroencephalogram with high accuracy. do.

The electroencephalogram measurement electrode according to the present invention includes an elastic support portion, one or a plurality of elastically deformable protrusions protruding from one surface of the support portion, and at least a boundary between the support portion and the protrusion portion. A deformation promoting portion provided in a part thereof is provided, and the supporting portion and the protruding portion are characterized by containing a nanocarbon material.

According to the present invention, in the electroencephalogram measurement electrode, a protrusion containing a nanocarbon material protrudes from one surface of the support portion. The protrusions have conductive paths inside and on the surface due to the nanocarbon material. When measuring the electroencephalogram, the surface of such a protrusion comes into contact with the scalp of the subject, so that sufficient conduction can be ensured without using a conductive paste.

Since the protruding portion can be elastically deformed, the subject does not feel discomfort such as pain even when pressure is applied. Since the side surface of the elastically deformed protrusion comes into contact with the scalp, the burden on the subject is reduced. Moreover, at least a part of the boundary between the protruding portion and the supporting portion is provided with a deformation promoting portion that promotes elastic deformation of the protruding portion. The protrusions can reliably contact and adhere to any area of the head on the sides. As a result, the electroencephalogram measuring electrode of the present invention can measure the electroencephalogram with high accuracy.

It is a perspective view seen from the top of the electrode for electroencephalogram measurement which concerns on this embodiment. It is a top view of the electrode for electroencephalogram measurement shown in FIG. It is a cross-sectional view of AA of the electrode for electroencephalogram measurement shown in FIG. It is a perspective view of a flexible part. It is the schematic of the mold for molding the electrode for electroencephalogram measurement. It is the schematic explaining the manufacturing process of the electrode for electroencephalogram measurement. It is a perspective view seen from the bottom of the electrode for electroencephalogram measurement. It is a perspective view of the electrode for electroencephalogram measurement of a modification. It is a figure explaining the state at the time of using the electrode for electroencephalogram measurement of a modification, FIG. 9A is a figure which shows the state before pressing, and FIG. 9B is a figure which shows the state after pressing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1. 1. Overall Configuration As shown in FIG. 1, the electroencephalogram measurement electrode 10 includes an elastic disk-shaped support portion 12 and a columnar projecting portion 14 projecting from one surface of the support portion 12. In the present embodiment, the three protruding portions 14 are projected. The protrusion 14 can be elastically deformed and contracted and / or tilted. The support portion 12 and the protrusion portion 14 include a nanocarbon material and have conductivity. The support portion 12 and the protrusion portion 14 are molded bodies using a thermoplastic elastomer as a base material, and have flexibility and cushioning properties. In the present embodiment, a polyamide-based thermoplastic elastomer is used as the thermoplastic elastomer.

The electroencephalogram measurement electrode 10 has a flexible portion 20. The flexible portion 20 is a molded body of a thermoplastic elastomer that does not contain a nanocarbon material. The flexible portion 20 has greater flexibility and cushioning than the protruding portion 14. The flexible portion 20 has a deformation promoting portion 16 provided at a boundary between the support portion 12 and the protruding portion 14. In the present embodiment, the deformation promoting portion 16 is an annular member arranged so as to connect the base ends of the three protruding portions 14 in the region on the outer edge side of the supporting portion 12. The deformation promoting portion 16 easily deforms to promote elastic deformation of the protruding portion 14.

The flexible portion 20 may have an additional portion 18 provided so as to surround the outer edge of the support portion 12. The additional portion 18 can be integrally molded with the deformation promoting portion 16. Due to the presence of the additional portion 18, the deformation promoting portion 16 is more easily deformed.

As shown in the top view of FIG. 2, the three protrusions 14 are provided at equal distances from the center of the support portion 12. In the present embodiment, the three protrusions 14 are arranged at positions corresponding to the vertices of the equilateral triangle. A sectional view taken along the line AA in FIG. 2 is shown in FIG. The deformation promoting portion 16 is provided on the outer edge side of the supporting portion 12 at the boundary between the supporting portion 12 and the protruding portion 14.

Since the projecting portion 14 is elastically deformable, it elastically deforms when pressure is received from the support portion 12, and contracts in the axial direction or tilts in an arbitrary direction. In the present embodiment, since the deformation promoting portion 16 is provided in the region on the outer edge side of the supporting portion 12 at the boundary between the supporting portion 12 and the protruding portion 14, the protruding portion 14 is on the deformation promoting portion 16 side (support). It easily tilts toward the outer edge side of the portion 12. In this case, the inner surface of the protruding portion 14 becomes the scalp contact surface that contacts the scalp.

The larger the size of the deformation promoting portion 16 with respect to the protruding portion 14, the greater the effect of promoting the elastic deformation of the protruding portion 14. However, the deformation promoting portion 16 that does not contain the nanocarbon material tends to reduce the conductivity required for the electroencephalogram measuring electrode 10. It is desirable to set the size of the deformation promoting portion 16 in consideration of the conductivity and the elastic deformation promoting effect.

In the present embodiment, carbon nanotubes (hereinafter referred to as CNT) are used as the nanocarbon material contained in the support portion 12 and the protruding portion 14. CNTs should be blended in an amount of 3-30 wt% of the base material to form conductive paths inside and on the inside and surface of the support 12 and protrusion 14 without compromising the elasticity of the thermoplastic elastomer as the base material. Is preferable. Supporting portion 12 and the projection 14 is preferably a volume resistivity of not more than 100 [Omega · cm.

As described above, the electroencephalogram measurement electrode 10 of the present embodiment includes a support portion 12, a protruding portion 14, and a flexible portion 20. The support portion 12 and the protrusion portion 14 are molded bodies using a thermoplastic elastomer as a base material, and include a nanocarbon material. The flexible portion 20 is a molded body of a thermoplastic elastomer. Since the thermoplastic elastomer and the nanocarbon material are both non-metals, the electrode for electroencephalogram measurement of the present embodiment does not include a metal member.

2. Manufacturing Method Next, a manufacturing method of the electroencephalogram measurement electrode 10 will be described. The electroencephalogram measurement electrode 10 can be manufactured by preparing the flexible portion 20 and integrating the flexible portion 20 with the flexible portion 20 while molding the support portion 12 and the protruding portion 14 by insert molding.

<Preparation of flexible part>
The flexible portion 20 as shown in FIG. 4 can be manufactured by molding a predetermined thermoplastic elastomer by injection molding using a predetermined mold. The injection molding conditions may be appropriately set according to the type of thermoplastic elastomer and the like.

<Manufacturing of support and protrusion>
First, the CNT and the thermoplastic elastomer are kneaded by a twin-screw extruder to prepare a CNT kneading raw material. The thermoplastic elastomer used here is preferably the same as that used for producing the flexible portion 20, but may be different. CNTs are produced by a general arc discharge method, a vapor phase growth method, a laser evaporation method, or the like. For example, Co, using a catalyst containing a metal such as Mg, CO gas and H ₂ gas may be used CNT produced by vapor deposition of a raw material.

Prior to the preparation of the CNT kneading raw material, the CNT may be pretreated with a mixed acid, if necessary. As the mixed acid, for example, a mixed solvent in which nitric acid and sulfuric acid are mixed at a volume ratio of 1: 1 can be used. CNT is added to the mixed solvent, stirred, and CNT is isolated and dispersed by irradiating with ultrasonic waves. Then, the CNT is taken out by vacuum filtration, and the CNT surface is neutralized with aqueous ammonia or the like. The surface of the neutralized CNT is washed with pure water and then dried to obtain a powdery CNT.

The obtained CNT is melt-kneaded with a thermoplastic elastomer by a twin-screw extruder to obtain a CNT-kneaded raw material. The conditions for melt-kneading can be appropriately selected depending on the type of thermoplastic elastomer and the like. The concentration of CNT is preferably about 3 to 30 wt% of the thermoplastic elastomer. The concentration of CNT is more preferably 10 wt% or more, and most preferably 20 wt% or more of the thermoplastic elastomer.

In order to integrate the support portion 12 and the protruding portion 14 with the flexible portion 20 while molding, a mold 30 as shown in FIG. 5 is used. The mold 30 is provided with a recess 32 having a shape corresponding to the flexible portion 20. Although not shown, the mold 30 has a recess having a shape corresponding to the protrusion 14 inside.

As shown in FIG. 6, the flexible portion 20 is arranged in the mold 30 and the CNT kneading raw material is poured into the mold 30 to produce a support portion 12 and a protruding portion 14 integrated with the flexible portion 20. By including CNT, the support portion 12 and the protrusion portion 14 have conductivity. In this way, the electroencephalogram measurement electrode 10 as shown in FIG. 7 is obtained. In the flexible portion 20, the region on the protruding portion 14 side becomes the deformation promoting portion 16, and the outer peripheral side of the supporting portion 12 becomes the additional portion 18.

The support portion 12, the projecting portion 14, and the flexible portion 20 all have flexibility and cushioning properties due to the use of the thermoplastic elastomer. However, since the support portion 12 and the protruding portion 14 contain CNT, the hardness of the support portion 12 and the protrusion portion 14 is larger than that of the flexible portion 20. Since the flexible portion 20 has the original physical characteristics of the thermoplastic elastomer, the flexible portion 20 is more flexible than the protruding portion 14 containing the CNT and is easily deformed.

The electroencephalogram measuring electrode 10 of the present embodiment can be used as a headset by attaching a plurality of electrodes 10 to, for example, a headband or a head cap so that the tip of the protruding portion 14 is in contact with the scalp. The plurality of electroencephalogram measuring electrodes 10 included in the headset do not necessarily all have a uniform shape and size, and the shape and size can be arbitrarily changed as needed.

3. 3. Action and effect In the electroencephalogram measurement electrode 10 configured as described above, the elastically deformable protrusion 14 protrudes from one surface of the support portion 12. When the electroencephalogram measuring electrode 10 is used, the tip of the protruding portion 14 is brought into contact with the scalp and pressed. The protruding portion 14 is elastically deformed and tilts toward the outer edge side of the supporting portion 12 to scrape the hair. As a result, the scalp contact surface (inner surface of the protrusion 14) can come into contact with the scalp while avoiding the hair.

The scalp contact surface of the electroencephalogram measurement electrode 10 is the surface of the protrusion 14 containing the nanocarbon material, and a conductive path is formed. When using the electroencephalogram measuring electrode 10 of the present embodiment, the scalp is in contact with the conductive path. Since the conductive path is also formed inside the protruding portion 14, the conduction between the electroencephalogram measurement electrode 10 and the head of the subject is ensured without using the conductive paste. The contact impedance can be lowered to an extremely low level, and the electroencephalogram measurement electrode 10 can accurately detect a weak electric signal from the head.

Moreover, the support portion 12, the protruding portion 14, and the flexible portion 20 constituting the electroencephalogram measurement electrode 10 have flexibility and cushioning properties, and the protruding portion 14 is elastically deformable. When measuring the electroencephalogram, even if the protrusion 14 is brought into contact with the head of the subject and pressure is applied, the subject does not feel uncomfortable because the protrusion 14 has elasticity. The electroencephalogram measurement electrode 10 of the present embodiment can reduce the burden on the subject.

In the conventional multi-pin type dry electrode, it is a hard metal multi-pin that comes into contact with the scalp of the subject. When the multi-pin dry electrode is pressed, the hard metal multi-pin is pressed against the scalp, causing the subject to feel pain. Since the electroencephalogram measurement electrode 10 has the elastically deformable protrusion 14, it is possible to avoid the inconvenience of the conventional multi-pin type dry electrode.

In the case of the present embodiment, the deformation promoting portion 16 containing no nanocarbon material is provided in the region on the outer edge side of the supporting portion 12 at the boundary between the supporting portion 12 and the protruding portion 14. Since the deformation promoting portion 16 has greater flexibility than the protruding portion 14 containing the nanocarbon material, it is easily deformed. When the tip of the protrusion 14 comes into contact with the scalp and is pressed, the deformation promoting portion 16 is deformed so that the protrusion 14 is easily elastically deformed and contracts and / or tilts. By easily contracting and / or tilting the protrusion 14, the electroencephalogram measurement electrode 10 can be reliably contacted and adhered to any region of the head on the inner surface of the protrusion 14, so that the electroencephalogram can be measured with high accuracy. It is possible to measure.

CNT as a nanocarbon material is not included in the deformation promoting unit 16. The additional portion 18 constituting the flexible portion 20 together with the deformation promoting portion 16 does not include the CNT. As a result, the ease of elastic deformation of the protruding portion 14 as described above is ensured. Moreover, since the amount of CNT used can be minimized, the manufacturing cost can be reduced.

The brain wave measurement electrode 10 according to the present embodiment includes a flexible portion 20 (deformation promoting portion 16, additional portion 18) made of a molded product of a thermoplastic elastomer, and a molded product of a thermoplastic elastomer containing CNT. The support portion 12 and the projecting portion 14 are composed of the support portion 12, and do not include a metal member. By not including the metal member, various advantages can be obtained.

For example, image information is acquired by X-ray computed tomography (CT) or magnetic resonance imaging (MRI) while the electroencephalogram measurement electrode 10 according to the present embodiment is attached to the head. However, no artifacts due to metal members occur. By using the electroencephalogram measurement electrode 10 of the present embodiment, it is possible to simultaneously acquire image information by X-ray CT, MRI, or the like and electroencephalogram by the electroencephalogram electrode.

Further, since the metal member is not included, the electroencephalogram measurement electrode 10 can be used for a subject having a metal allergy. The electroencephalogram measurement electrode 10 according to the present embodiment can be disposable and is excellent in hygiene. Since the electroencephalogram measurement electrode 10 can be manufactured by insert molding, it is excellent in mass productivity and can reduce the manufacturing cost.

4. Modifications The present invention is not limited to the above embodiment, and can be appropriately modified within the scope of the gist of the present invention.

The support portion 12, the projecting portion 14, and the flexible portion 20 may have flexibility and cushioning properties, and an elastic body such as a thermoplastic elastomer, resin, or rubber other than the polyamide-based thermoplastic elastomer can be used as a raw material. can. Using any elastic body as a raw material, the support portion 12, the projecting portion 14, and the flexible portion 20 can be manufactured by the above-mentioned method.

Examples of thermoplastic elastomers other than polyamide-based thermoplastic elastomers include urethane-based thermoplastic elastomers (TPU), olefin-based thermoplastic elastomers (TPO), styrene-based thermoplastic elastomers (TPS), and ester-based thermoplastic elastomers (TPC). , Polyamide-based thermoplastic elastomer (TPAE), polyvinyl chloride-based thermoplastic elastomer (TPVC) and the like.

Examples of the resin include acrylonitrile styrene (AS) resin, acrylonitrile butadiene (ABS) resin, epoxy resin, tetrafluoroethylene / ethylene copolymer (ETFE), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), and hexafluoro. Propropylene / ethylene copolymer (EFEP), polyvinylidenefluorolide (PVDF), polychlorotrifluoroethylene (PCTFE), chlorotrifluoroethylene / ethylene copolymer (ECTFE), polycaproamide (nylon 6), polyhexa Methylene adipamide (nylon 66), polytetramethylene adipamide (nylon 46), polyhexamerylene sebacamide (nylon 610), polyhexamelylene dedecamide (nylon 612), polydodecaneamide (nylon 12) , Polyundecaneamide (Nylon 11), Polyhexamethylene terephthalamide (Nylon 6T), Polyxylylene adipamide (Nylon XD6), Polynonamethylene terephthalamide (Nylon 9T), Polyundecane methylene terephthalamide (Nylon 11T), Polydecamethylene decaneamide (nylon 1010), polydecamethylene dodecaneamide (nylon 1012) amide-based elastomer (TPA), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), polyethylene naphthalate (PEN), polycarbonate ( PC), linear low density polyethylene (LLDPE), ultra low density polyethylene, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), crosslinked polyethylene, ethylene / vinyl acetate copolymer (PC) EVA), ethylene / vinyl alcohol copolymer (EVOH), butenediol / vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVA), polybutene (PB), modified polyphenylene ether (modified PPE), liquid crystal polymer (LCP) , Cycloolefin Copolymer (COC), Polyether Ketone (PEK), Polyglycolic Acid (PGA), Polyallylate (PAR), Polymethylpentene (PMP), Polyether Ether Ketone (PEEK), Polyether Salfone (PES) , Polyethylene terephthalate (PET), phenolic resin (PF), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) ), Polyethylene (PI), Polyetherimide (PEI), Acrylic resin (PMMA), Polyacetal (POM), Polypropylene (PP), Polyphenylene sulfide (PPS), Polystyrene (PS), Polysulfone (PSU), Polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC) and the like.

Examples of rubber include natural rubber (NR), ethylene / propylene rubber (EPM, EPDM), chloroprene rubber (CR), butyl rubber (IIR), polyurethane rubber (U), silicone rubber (VMQ, FVMQ), and acrylic rubber (ACM). ), Epichlorohydrin rubber (ECO), Fluorine rubber (FKM, FEPM, FFKM), Nitrile rubber (NBR), Hydrogenated nitrile rubber (H-NBR), Chlorinated polyethylene (CPE), Chlorosulfonated polyethylene (CSM), Examples thereof include butadiene rubber (BR) and styrene / butadiene rubber (SBR).

CNTs as nanocarbon materials are not limited to tubular ones. A CNT whose shape has changed due to heating or the like may be used. Nanocarbon materials other than CNTs, such as graphene, can also be used. Graphene is a nanocarbon material having high conductivity similar to CNT. A graphene kneading raw material can be prepared by the same method as described above except that the CNT is changed to graphene, and the support portion 12 and the protruding portion 14 can be molded using the raw material. It is also possible to use CNT and graphene in combination.

If consideration for artifacts is not required, even if a part of the electroencephalogram measurement electrode 10 contains a metal member such as a metal plate, as long as the flexibility and cushioning property of the electroencephalogram measurement electrode 10 are not impaired. good. For example, a metal plate may be arranged on the surface of the support portion 12. By providing the metal plate, the electric signal can be easily transmitted, and the measurement accuracy can be further improved.

In the above embodiment, the flexible portion 20 (deformation promoting portion 16 and the additional portion 18) does not include CNT as a nanocarbon material, but the present invention is not limited to this. The flexible portion 20 may contain a nanocarbon material as long as it can maintain the property of being more flexible and more easily deformed than the support portion 12.

Further, in the above embodiment, the protruding portion 14 protrudes linearly from the supporting portion 12, but other shapes are also possible. For example, as shown in the electroencephalogram measuring electrode 10A of the modified example of FIG. 8, the tip of the protruding portion 24 may be inclined toward the outer edge side of the supporting portion 12. The electroencephalogram measurement electrode 10A has the same configuration as the electroencephalogram measurement electrode 10 shown in FIG. 1 and the like except that this point is different.

When the electroencephalogram measurement electrode 10A is used, as shown in FIG. 9A, the support portion 12 side is attached to the headgear 42, and the tip of the protrusion 24 is brought into contact with the scalp 40. When the protruding portion 24 is not subjected to pressure and is not pressed against the scalp 40, the end surface 24a at the tip of the protruding portion 24 comes into contact with the scalp 40.

As shown in FIG. 9B, when a force in the direction of arrow B is applied to the electroencephalogram measurement electrode 10A, the protruding portion 24 is pressed by the support portion 12 and elastically tilts. Since the deformation promoting portion 16 is provided in the region on the outer edge side of the supporting portion 12 at the boundary between the supporting portion 12 and the protruding portion 24, the protruding portion 24 is easily tilted outward.

Since the tip of the protruding portion 24 is tilted to the same side as the deformation promoting portion 16 (the outer edge side of the supporting portion 12), the protruding portion 24 is tilted to the deformation promoting portion 16 side more easily. Moreover, since the tip of the protruding portion 24 is tilted, the region in contact with the scalp 40 becomes wider like the scalp contact surface 24b. As a result, the accuracy of EEG measurement is improved.

The deformation promoting portion 16 may be provided in the inner region of the supporting portion 12 at the boundary between the supporting portion 12 and the protruding portion 14. In this case, the protrusion 14 is pressed and tilts inward to come into contact with the scalp on the outer surface. Further, the tip of the protruding portion may be tilted inward of the supporting portion from the middle in the length direction. Since the tip of the protrusion is tilted to the same side as the deformation promoting portion, it tilts inward more easily.

If the deformation promoting portion 16 is provided at least a part of the boundary between the supporting portion 12 and the protruding portion 14, the number of protruding portions 14 protruding from one surface of the supporting portion 12 can be appropriately selected. Further, the support portion 12 does not have to be circular, and may be a polygon such as a quadrangle. For example, when a quadrangular support is used, four protrusions can be provided at positions corresponding to the vertices of the quadrangle on one surface.

10 Electrodes for EEG measurement 12 Support part 14 Protruding part 16 Deformation promotion part

Claims (8)

Elastic disc-shaped support,
One or more elastically deformable protrusions protruding from one surface of the support, and deformation promotion provided in at least a part of the boundary between the support and the protrusion on the outer edge side of the support. With a part
The deformation promoting portion is more flexible than the supporting portion and the protruding portion.
Said support portion and the protrusion, seen contains nano carbon material,
An electroencephalogram measuring electrode characterized in that when the tip of the protruding portion is pressed, the deformation promoting portion is deformed and the protruding portion is tilted toward the deformation promoting portion. The electrode for measuring brain waves according to claim 1, wherein the plurality of protruding portions are provided at equal distances from the center of the supporting portion. The electrode for electroencephalogram measurement according to claim 1 or 2, wherein the plurality of protrusions have a tip inclined toward the outer edge side of the support portion. The electrode for electroencephalogram measurement according to any one of claims 1 to 3 , wherein the protruding portion and the supporting portion have a volume resistivity of 100 Ω · cm or less. The electrode for electroencephalogram measurement according to any one of claims 1 to 4 , wherein the nanocarbon material is selected from carbon nanotubes and graphene. The electrode for electroencephalogram measurement according to any one of claims 1 to 5 , wherein the deformation promoting portion is made of a molded product of a resin, a thermoplastic elastomer, or a rubber. The electrode for electroencephalogram measurement according to any one of claims 1 to 6 , wherein the support portion and the protruding portion are made of a resin, a thermoplastic elastomer, or a rubber molded body as a base material. The electrode for electroencephalogram measurement according to any one of claims 1 to 7 , wherein the support portion, the protrusion portion, and the deformation promoting portion do not include a metal member.

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