Electroencephalogram measurement device

Abstract

Provided is an electroencephalogram measurement device (10) comprising: a support body (110) that is to be attached to the head and is divided into a plurality of pieces; an electrode unit (brain wave electrode member (120)) that is held by the support body (110); a buffer material (500) that is provided in a gap between the pieces adjacent to each other; and a connection part (400) that determines the relative positions of the pieces adjacent to each other.

Description

EEG measuring device

[0001] The present invention relates to an electroencephalogram measuring device.

[0002] In electroencephalogram (EEG) measurements, electrodes are placed on the head to conduct electrical measurements.

[0003] Patent Document 1 describes measuring electroencephalograms by bringing the tips of electrode pins supported by an elastic member into contact with the scalp.

[0004] Japanese Patent Application Laid-Open No. 2020-000268

[0005] However, in an EEG measuring device, if the support that supports the EEG electrode member is a net type or arm type, it is difficult to keep it attached when the subject is in a sleeping position, such as when sleeping, and force is acting on the EEG measuring device.

[0006] An object of the present invention is to provide a technology that allows electroencephalograms to be measured while the subject is still wearing the electroencephalogram measuring device, even when force is acting on the device, such as when the subject is in a sleeping position.

[0007] According to the present invention, the following technologies are provided: 1. An electroencephalogram (EEG) measuring device comprising: a support divided into multiple pieces to be worn on the head; an electrode unit held by the support; cushioning material provided in the gaps between adjacent pieces; and a connecting portion that determines the relative positions of the adjacent pieces. 2. The electroencephalogram (EEG) measuring device according to 1., in which the connecting portion is a hook-and-loop fastener provided on the outer surface of the support. 3. The electroencephalogram (EEG) measuring device according to 1. or 2., in which the amount of deformation of the cushioning material when a compressive load of 10 N is applied is 0.5 mm or more and 9.5 mm or less, as measured by the following (method). (Method) A test piece of the cushioning material (dimensions: length 50 mm x width 50 mm x height 10 mm) and a push-pull gauge equipped with a disk-shaped pressure piece with a diameter of 20 mm are set on a measurement table having a displacement meter. The test piece is compressed by the pressure piece, the position of the pressure piece is lowered by 0.2 mm, and this state is maintained for 20 seconds each time. After maintaining this state for 20 seconds, the compression load (N) is read, and the amount of change (mm) in the position of the pressure piece is plotted on the x-axis and the compression load (N) on the y-axis, and an SS curve is created by repeating this process. From the obtained SS curve, the amount of change in the position of the pressure piece when a compression load of 10 N is applied is read and used as the amount of deformation when a compression load of 10 N is applied. 4. The electroencephalogram measuring device described in any of 1. to 3., having as the multiple pieces a central piece facing the top of the head, a right piece to the right of the central piece, and a left piece to the left of the central piece. 5. The electroencephalogram measuring device described in 4., wherein the right piece and the left piece each face at least the temporal region. 6. 4. The electroencephalogram measuring device according to 4. or 5., wherein a dividing line (A) dividing the center piece and the right piece passes between Fp2 and F8, Fz and F4, Cz and C4, and T6 and T4 in the International 10-20 electrode placement method, and a dividing line (B) dividing the center piece and the left piece passes between Fp1 and F7, Fz and F3, Cz and C3, and T5 and T3 in the International 10-20 electrode placement method.7. The electroencephalogram measuring device according to any one of 4. to 6., wherein the central piece has a first central piece on the frontal side and a second central piece on the occipital side, and a dividing line (C) dividing the first central piece and the second central piece passes between Fp1 and Fz and between Fp2 and Fz in the International 10-20 electrode placement method.

[0008] According to the present invention, it is possible to provide a technology that enables EEG measurement while the EEG measuring device is still being worn, even when the subject is in a sleeping position or other situation in which force is acting on the device.

[0009] 1 is a diagram illustrating a partial cross section of an EEG measurement device according to an embodiment. FIG. 2 is a perspective view illustrating an EEG measurement device according to an embodiment. FIG. 3 is a diagram illustrating a state in which a support according to an embodiment is worn on a person's head. FIG. 4 is a diagram illustrating the inside of a support according to an embodiment. FIG. 5 is a cross-sectional view showing an EEG electrode member when an EEG measurement device according to an embodiment is worn on a head. FIG. 6 is a cross-sectional view of an EEG electrode member according to an embodiment. FIG. 7 is a diagram explaining the pieces of a support divided into four parts according to an embodiment and the positions of EEG electrode members according to the International 10-20 electrode placement method. FIG. 8 is a three-dimensional view focusing on the left side of a support divided into four parts according to an embodiment. FIG. 9 is a three-dimensional view focusing on the right side of a support divided into four parts according to an embodiment. FIG. 10 is a front view showing a support divided into four parts according to an embodiment, connecting parts connecting the pieces, and cushioning material provided between the pieces. FIG. 11 is a diagram showing a compression SS curve of cushioning material provided between pieces of a support divided into four parts according to an embodiment.

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all drawings, like components are designated by like reference numerals, and their description will be omitted where appropriate. In this specification, the right side as seen from the subject when the subject wears the EEG measurement device of this embodiment on their head as shown in FIG. 3 will be referred to as the right, and the left side as seen from the subject. First, a basic form of EEG measurement device in which EEG electrodes are attached to a helmet-type support will be described. Next, a configuration in which the helmet-type support is divided into multiple pieces will be illustrated, with a four-piece division.

[0011] The electroencephalogram measuring device of this embodiment includes a support divided into multiple pieces to be worn on the head, an electrode unit held by the support, buffer materials provided in the gaps between adjacent pieces, and connecting parts that determine the relative positions of the adjacent pieces. Note that in this embodiment, the electrode unit is also called an electroencephalogram electrode member.

[0012] <Basic Form of EEG Measuring Device> <Overview> Fig. 1 is a diagram illustrating an example of a partial cross section of an EEG measuring device 10 according to an embodiment. Figs. 2 to 4 are diagrams illustrating an overall view of the EEG measuring device 10. Fig. 2 is a perspective view of the EEG measuring device 10 as seen from above. Fig. 3 is a view of the EEG measuring device 10 as seen from the front in a state where it is attached to a head 20. Fig. 4 is a diagram illustrating an example of the state of the inside of a support 110 of the EEG measuring device 10 (the side where the head 20 is inserted).

[0013] The EEG measuring device 10 includes a support 110, a support elastic member 130, a holding unit 180, and an EEG electrode member 120. EEGs are measured by bringing the EEG electrode member 120 of the EEG measuring device 10 into contact with the head 20 (scalp 22). The EEG electrode member 120 is attached to the support elastic member 130 via the holding unit 180 and is held by the support 110.

[0014] Although details will be described later, the support 110 is, as an example, a helmet type to be worn on the head 20, and has a support through-hole 114 that penetrates from the inside to the outside, and a support elastic member 130 embedded in the support through-hole 114. The EEG electrode member 120 is held on a bottom surface 132 of the support elastic member 130 via a holding portion 180. In the examples of Figures 2 to 4, the support 110 is depicted as if it were one piece for convenience, but as will be described later using other figures, the support 110 is actually divided into multiple pieces.

[0015] The support elastic member 130 is provided with an elastic member recess 131 recessed from the surface toward the bottom. The elastic member recess 131 is connected to the support through-hole 114. A finger or the like can be inserted into the elastic member recess 131 through the support through-hole 114 to operate the support elastic member 130 or to operate the holding part 180 attached to the support elastic member 130, thereby adjusting the orientation of the EEG electrode member 120, etc.

[0016] 2 to 4, the support 110 is helmet-shaped. When the support 110 is helmet-shaped, the support 110 has a recess into which the head 20 is inserted. The EEG measuring device 10 is configured so that one or more EEG electrode members 120 come into contact with the head 20 (scalp 22) when the helmet-shaped support 110 is attached to the head 20. The EEG measuring device 10 may also include a belt 170 for fixing the support 110 to the head 20, as shown in FIGS. 3 and 4.

[0017] Hereinafter, the side of the support 110 facing the head 20 (scalp 22) will be referred to as the inside of the support 110, and the side opposite the inside will be referred to as the outside of the support 110. In FIG. 1 , the direction from the inside to the outside of the support 110 is referred to as the z direction. The x direction, y direction, and z direction are perpendicular to each other. The z direction is generally the normal direction to the scalp 22. Note that the x direction, y direction, and z direction can be defined as different directions for each EEG electrode member 120 in the EEG measurement device 10.

[0018] In the examples of Figures 2 to 4, the support 110 holds multiple EEG electrode members 120. With the support 110 attached to the head 20, each EEG electrode member 120 can be brought into contact with a predetermined position on the head 20. EEG signals are then measured using the multiple EEG electrode members 120. For example, the support 110 can hold seven EEG electrode members 120. The positions of the seven EEG electrode members 120 may correspond to positions F3, F4, C3, C4, P3, Pz, and P4 in the International 10-20 electrode placement system. Hereinafter, electrode positions in the International 10-20 electrode placement system will be referred to as "electrode positions" for convenience. For example, F3 in the International 10-20 electrode placement system will also be referred to as "electrode position F3." The number and positions of the EEG electrode members 120 on the support 110 are not particularly limited and can be set according to the application, etc. The EEG signals measured by each EEG electrode member 120 are transmitted to the signal processing unit 160.

[0019] In the example of FIG. 1 , the electroencephalogram measuring device 10 further includes a support elastic member 130 and a holding unit 180. The support elastic member 130 is elastically deformable. The support elastic member 130 has a recess (elastic member recess 131) that is recessed from the outside toward the inside. In this embodiment, at least a portion of the bottom surface of the elastic member recess 131 has a second through-hole (hereinafter also referred to as an "elastic member through-hole 135") that penetrates the support elastic member 130. In this embodiment, a configuration is exemplified in which substantially the entire bottom surface of the elastic member recess 131 is formed as the elastic member through-hole 135. In the following description, unless otherwise specified, the elastic member recess 131 and the elastic member through-hole 135 are described as being the same thing.

[0020] The shape of the support 110 is determined based on, for example, an average head shape. However, head shapes vary greatly from person to person, and an element that can accommodate these differences is necessary. In an EEG measurement device 10 in which the EEG electrode member 120 is held to the support 110 via a support elastic member 130, the support elastic member 130 elastically deforms when the support 110 is attached to the head 20. The elastic deformation of the support elastic member 130 allows the EEG electrode member 120 to be stably brought into contact with the scalp, enabling EEG measurement, even if there are individual differences in head shape (irregularities and surface angles). Note that a structure in which the helmet-shaped support 110 is divided into multiple pieces to better accommodate individual differences in head shape (irregularities and surface angles) will be described later with reference to Figures 7 to 11.

[0021] As described above, a finger or the like is inserted into the support 110 through the support through-hole 114 provided in the covering member 112 of the support 110 to operate the support elastic member 130 (elastic member recess 131) and the holding member 180. Since a structure protruding from the inside of the support 110 to the outside is not required to adjust the orientation of the EEG electrode member 120, the center of gravity can be stabilized when attached to the head 20. In addition, the subject can assume a sleeping position while wearing the support 110, thereby reducing noise caused by body movement, etc. Furthermore, EEG measurement can be performed while the subject is moving around.

[0022] Furthermore, the EEG electrode member 120 is detachable from the support 110. This allows the EEG electrode member 120 to be replaced as needed, or different types of EEG electrode member 120 to be used for different measurements. Each component of the EEG measurement device 10 will be described in detail below.

[0023] <Details of Each Component of the EEG Measuring Device> Fig. 5 is a cross-sectional view showing the EEG electrode member 120 in a state before the EEG measuring device 10 is attached to the head, and corresponds to Fig. 1. The following description will be made mainly with reference to Figs. 1 and 5.

[0024] <Support Body> The support body 110 has a shape that can cover at least a portion of the head 20. The support body 110 only needs to be attachable to the head 20, and may be made of, for example, cloth or rubber. The support body 110 may be, for example, helmet-shaped, hat-shaped, or band-shaped. In this embodiment, the support body 110 includes a base body 111 and a covering member 112. The base body 111 is located on the head 20 side when the support body 110 is attached to the head 20. The covering member 112 is located on the opposite side from the head 20 side when the support body 110 is attached to the head 20.

[0025] The base 111 is made of, for example, polystyrene foam, rigid polyurethane foam, polyethylene foam, polypropylene foam, or the like. The base 111 is provided with a plurality of (seven in this example) holes 115 that penetrate vertically at positions corresponding to the above-mentioned electrode positions F3, F4, C3, C4, P3, Pz, and P4. Support elastic members 130 are housed in the holes 115. The covering member 112 is made of, for example, resin. The covering member 112 is harder than the base 111 and can protect the head 20. However, the support 110 does not necessarily have to include the covering member 112.

[0026] <Support body elastic member> The support body elastic member 130 is housed in a hole 115 provided in the base 111 of the support body 110. The outer shape and size of the support body elastic member 130 are approximately the same as the inner shape and size of the hole 115 provided in the support body 110, and the support body elastic member 130 is fitted into the hole 115 of the support body 110.

[0027] When the support body 110 is not attached to the head 20, the support body elastic member 130 may fill the entire hole 115 provided in the support body 110 except for the elastic member recess 131. The covering member 112 is provided with a support body through-hole 114. The elastic member recess 131 provided in the support body elastic member 130 and the support body through-hole 114 provided in the covering member 112 are in communication with each other.

[0028] 5, the diameter d2 of the support through-hole 114 is preferably larger than the diameter d1 of the elastic member recess 131. By making the diameter d2 of the support through-hole 114 larger in this manner, it becomes easier to operate the holding part 180. As a result, it becomes easier to adjust the orientation, etc. of the EEG electrode member 120.

[0029] The support elastic member 130 is made of an elastic material, such as one or more selected from the group consisting of urethane sponge, polyethylene sponge, polypropylene sponge, and silicone rubber sponge. The elastic material may be a foam, such as a low-resilience sponge or a low-resilience elastic foam.

[0030] The support elastic member 130 can be configured without a spring. When a spring is used, the repulsive force of the spring increases in proportion to the amount of deformation of the spring. Therefore, when the amount of deformation is large, excessive repulsive force is generated, making the subject more likely to feel pain. On the other hand, when a foam elastic material is used, there is a range of displacement in which the repulsive force does not increase significantly (is not proportional) with an increase in the amount of deformation. By configuring the support elastic member 130 to be usable within this range of displacement, an appropriate repulsive force can be obtained even if the amount of deformation varies depending on the position of the EEG electrode member 120.

[0031] The hardness H of the elastic material, as measured by JIS K 6400-2・A method, is, for example, 10 N or more and 200 N or less. From the viewpoint of further reducing the burden on the subject, the hardness H is preferably 150 N or less, and more preferably 100 N or less. Furthermore, from the viewpoint of more stably pressing the EEG electrode member 120 against the scalp 22, the hardness H is preferably 30 N or more, and more preferably 50 N or more.

[0032] The thickness t of the support elastic member 130 is, for example, 10 mm or more and 100 mm or less when the support 110 is not attached to the head 20. Here, the thickness t refers to the thickness of the support elastic member 130 in a direction perpendicular to the bottom surface 132 of the support elastic member 130 that faces the head 20. The support elastic member 130 is fixed to the support 110 at one end, and the thickness t of the support elastic member 130 is variable depending on the force it receives in the thickness direction. Specifically, the support elastic member 130 is fixed to the support 110 at the surface (top surface 133) opposite the bottom surface 132. When the support 110 is not attached to the head 20, the thickness t of the support elastic member 130 is preferably 20 mm or more and 60 mm or less. The lower limit of the thickness t is preferably 25 mm or more, more preferably 30 mm or more. The upper limit of the thickness t is preferably 55 mm or less, more preferably 50 mm or less. By setting the thickness t to this value, it is possible to compress the electrode member 120 appropriately according to the shape of the head 20, and the EEG electrode member 120 can be pressed appropriately against the scalp 22 while minimizing discomfort to the subject.

[0033] The area of ​​the bottom surface 132 of the support elastic member 130 facing the head is, for example, 3 cm ２ 25cm or more ２ The lower limit is preferably 5 cm. ２ More preferably, 7 cm ２ This ensures an appropriate size for the EEG electrode member 120, and allows for a stable posture (direction). The upper limit is preferably 20 cm. ２ More preferably, it is 15 cm or less. ２ The shape is as follows. This prevents the orientation of the EEG electrode member 120 from moving too much, making adjustment difficult. The shape of the bottom surface is not particularly limited. Examples of the shape of the bottom surface include a circle, a square, an egg shape, an ellipse, etc. From the viewpoint of making it easier to rotate the EEG electrode member 120, a circle is preferable. On the other hand, if it is not desirable to rotate the EEG electrode member 120, a shape other than a circle is preferable.

[0034] <Holding section> The holding section 180 is provided on the bottom surface 132 of the support elastic member 130. The holding section 180 holds the EEG electrode member 120 on the surface (bottom surface 183) opposite to the support elastic member 130. In other words, the EEG electrode member 120 is attached to the support elastic member 130 via the holding section 180. The holding section 180 may be detachable from the support elastic member 130.

[0035] The holding portion 180 integrally includes a base portion 181 and a protrusion portion 182. The holding portion 180 is made of, for example, hard plastic, and the base portion 181 and the protrusion portion 182 are molded at the same time.

[0036] The base 181 is generally disk-shaped (flange-shaped) with a predetermined thickness. The base 181 has a conductive portion 164 and a circuit 162. Specifically, the bottom surface 183 of the base 181 has a first accommodating portion 185 recessed to accommodate the conductive portion 164 and a second accommodating portion 186 recessed to accommodate the circuit 162. The first accommodating portion 185 is provided at the center of the disk shape. The position of the second accommodating portion 186 is not particularly limited, but it is provided so that the accommodated circuit 162 functions appropriately. The function of the circuit 162 will be described later.

[0037] The protrusion 182 is cylindrical and protrudes upward (in the z direction) from the center of the upper surface 184 of the base 181 (i.e., the center of the disk shape). The protrusion 182 is fitted into the elastic member recess 131 (elastic material through-hole 135) of the support elastic member 130 from the bottom side of the elastic member recess 131.

[0038] <Circuit> The circuit 162 includes, for example, a preamplifier that amplifies the electrical signal from the EEG electrode member 120. The circuit 162 is electrically connected to the conductive portion 164 by a wiring 163, and acquires the EEG signal from the EEG electrode member 120 via the conductive portion 164. The circuit 162 performs amplification processing according to predetermined settings, and transmits the signal to the signal processing unit 160 via a wiring 165.

[0039] <EEG electrode member> Figure 6 is a cross-sectional view of the EEG electrode member 120. The EEG electrode member 120 comprises an electrode main body 125, a conductive member 124, and wiring 127. The electrode main body 125 has a cylindrical base 122 and an electrode convex portion 123 protruding from the lower surface (hereinafter also referred to as the "convex portion forming surface 126") of the base 122. The conductive member 124 is attached to the upper surface 128 of the base 122.

[0040] <Conductive Member> The conductive member 124 is, for example, a conductive metal, and has a first portion 124a and a second portion 124b. The first portion 124a and the second portion 124b are integrally formed.

[0041] The first portion 124a is columnar (cylindrical). A screw groove is provided on the outside of the first portion 124a. The second portion 124b is, for example, disk-shaped. The first portion 124a is threadedly fitted into the conductive portion 164 of the holding portion 180.

[0042] <Electrode Body> The electrode body 125 includes a cylindrical base 122 and one or more electrode protrusions 123 provided on the base 122 .

[0043] The electrode protrusion 123 has a first portion 123a, a conductive portion 123b, and a second portion 123c. A plurality of electrode protrusions 123 are provided on the surface of the base 122 opposite to the conductive member 124 side.

[0044] The base 122 and the first portion 123a are integrally formed using a rubber-like elastic body. Ten or more electrode protrusions 123 may be provided. The first portion 123a may have a shape such as a cone or a pyramid. The conductive portion 123b is provided so as to cover the first portion 123a. The tip of the first portion 123a is covered with the second portion 123c. The second portion 123c is a spherical member made of a gel-like material (also called hydrogel) containing water inside, and is attached so as to pierce the tip of the first portion 123a.

[0045] When the EEG electrode member 120 is pressed against the head 20 to measure EEG, the second portion 123c comes into contact with the head 20. At this time, electrolytes (generally salt) from the scalp 22 are absorbed into the second portion 123c. As a result, the EEG electrode member 120 and the scalp 22 are electrically connected. The shape of the second portion 123c is not limited to a sphere. The gel material constituting the second portion 123c is not particularly limited as long as it is capable of sufficient water absorption and has sufficient strength and flexibility when pressed against the head 20; for example, an acrylic hydrogel or a silicone hydrogel can be used.

[0046] The materials of the base 122 and the first portion 123a will be described. The base 122 and the first portion 123a are configured to have a rubber-like elastic body. Specific examples of the rubber-like elastic body include rubber and thermoplastic elastomer (also simply referred to as "elastomer (TPE)"). Examples of rubber include silicone rubber. Examples of thermoplastic elastomers include styrene-based TPE (TPS), olefin-based TPE (TPO), vinyl chloride-based TPE (TPVC), urethane-based TPE (TPU), ester-based TPE (TPEE), and amide-based TPE (TPAE).

[0047] The conductive portion 123b is formed using a paste containing a highly conductive metal, such as copper, silver, gold, nickel, tin, lead, zinc, bismuth, antimony, or an alloy thereof.

[0048] Wiring 127 connected to conductive portion 123b is provided inside first portion 123a. Wiring 127 electrically connects conductive portion 123b and conductive member 124. Wiring 127 may be made of, for example, conductive fiber. The conductive fiber may be one or more types selected from the group consisting of metal fiber, metal-coated fiber, carbon fiber, conductive polymer fiber, conductive polymer-coated fiber, and conductive paste-coated fiber. These may be used alone or in combination of two or more types.

[0049] The EEG electrode member 120 is attached to the conductive portion 164 by screwing the first portion 124a of the conductive member 124 into the conductive portion 164 of the holding portion 180. In this way, the EEG electrode member 120 is attached to the support elastic member 130.

[0050] <Electrical Connection Relationships in the EEG Measuring Device> The electrical connections in the EEG measuring device 10 will be described below. The EEG measuring device 10 further includes wires 163, 165, a circuit 162, a signal processing unit 160, and a reference potential measuring wire 161 (see FIG. 4). Of these, the conductive portion 164, the wire 165, and the circuit 162 are provided for each EEG electrode member 120. The wire 163 and the circuit 162 are fixed to the holding portion 180 together with the conductive portion 164.

[0051] When the scalp 22 comes into contact with the second portion 123c, an electrical signal from the scalp 22 is transmitted to the conductive member 124 via the second portion 123c, the conductive portion 123b, and the wiring 127. The electrical signal obtained in each EEG electrode member 120 in this manner is sent from the conductive member 124 of the EEG electrode member 120 to the signal processing unit 160 via the conductive portion 164, the wiring 163, the circuit 162, and the wiring 165.

[0052] The signal processing unit 160 is connected to a circuit 162 of the EEG electrode member 120 (holding unit 180), and acquires data measured by the EEG electrode member 120 via the circuit 162. The signal processing unit 160 performs processes such as amplification of the EEG electrical signal, analog-to-digital conversion, and frequency filtering. The signal processing unit 160 can record the EEG signal data obtained by these processes in a recording unit provided within the signal processing unit 160. The signal processing unit 160 can also transmit the EEG signal data to an external device via wired or wireless communication.

[0053] It is preferable that the signal processing unit 160 has a built-in battery. This eliminates the need to connect a power line to the signal processing unit 160 to supply power. This allows the subject to move and be active to a certain degree during measurement. It also prevents noise that depends on the frequency of the power supply. The reference potential measurement wiring 161 connects the signal processing unit 160 to a reference electrode (not shown). The reference electrode is an electrode used to obtain a reference potential that serves as a reference for measuring EEG signals. The reference electrode is attached, for example, with a clip to the earlobe or the top of the outer ear, or attached around the bone on the back of the outer ear to obtain the reference potential.

[0054] <Method of Using the EEG Measuring Device> The method of using the EEG measuring device 10 configured as described above will be described below. First, as shown in Fig. 3, the support 110 with the EEG electrode members 120 attached is worn on the head 20. The EEG electrode members 120 are provided on the bottom surface 132 side of the support elastic member 130 via a holding portion 180.

[0055] At this time, the support elastic member 130 contracts in the thickness direction depending on the state of the head 20, and the EEG electrode member 120 is pressed against the scalp 22. That is, the support elastic member 130 deforms depending on the position and angle of the scalp 22 relative to the support 110. Furthermore, the EEG electrode member 120 is pressed against the scalp 22 with a force according to the elasticity of the support elastic member 130. That is, as the support elastic member 130 contracts, the position and angle of the tip of the EEG electrode member 120 relative to the support 110 change to fit the shape of the head 20.

[0056] If there is any discomfort in the contact state between the EEG electrode member 120 and the scalp 22, a finger or the like can be inserted through the support through-hole 114 to manipulate the elastic material through-hole 135 of the support elastic member 130 and the holding portion 180, thereby adjusting the orientation of the EEG electrode member 120. By performing such manipulation, the hair on the scalp 22 can be parted, improving the contact state between the EEG electrode member 120 and the scalp 22.

[0057] 7 to 11, examples of electroencephalogram measuring devices 10 in which the support 110 is divided into a plurality of pieces are shown. Below, an example in which the support is divided into four pieces (divided form) is described, but the number of pieces when divided and the division method are not limited to this example, and various forms can be used.

[0058] (Dividing the support body) An example in which the support body 110 is divided into four pieces will be described with reference to Figures 7 to 11. Figure 7 is a diagram illustrating the divided pieces of the support body 110 and the position of the EEG electrode member 120 according to the International 10-20 electrode placement method. Figure 8 is a three-dimensional view focusing on the left side of the support body 110. Figure 9 is a three-dimensional view focusing on the right side of the support body 110. Figure 10 is a front view showing the support body 110, the connecting parts 400 that connect the pieces together, and the cushioning material 500 provided between the pieces.

[0059] The support 110 is divided into multiple pieces. Each piece has a base 111 and a covering member 112 as described in the basic configuration. Each piece has multiple through-holes corresponding to the holes 115 in the basic configuration, and EEG electrode members 120 are attached via support elastic members 130 and holding members 180. As shown in FIG. 10 , the support 110 also has buffer materials 500 (e.g., elastic members) provided in the gaps between adjacent pieces and connecting members 400 (e.g., hook-and-loop fasteners) that determine the relative positions of adjacent pieces. The EEG measurement device 10 will be described below, focusing on the support 110 divided into multiple pieces. The configuration of the EEG electrode members 120 and the structure for attaching the EEG electrode members 120 to the support 110 are the same as those in the basic configuration, and therefore, a description of these similar components will be omitted.

[0060] The multiple pieces include a central piece 300 facing the top of the head, a right piece 340 on the right side of the central piece 300, and a left piece 330 on the left side of the central piece 300. In this specification, the top of the head refers to the position of the top of the head 20 of the subject when the electroencephalogram measuring device 10 of this embodiment is worn on the head 20 by the subject as shown in Figure 3.

[0061] The right piece 340 and the left piece 330 each face at least the temporal region. In other words, when the support 110 is attached to the head 20, the right piece 340 is positioned to cover the right temporal region, and the left piece 330 is positioned to cover the left temporal region. In this specification, the temporal region refers to the position of the temporal region on the subject's head when the electroencephalogram measuring device 10 of this embodiment is attached to the head 20 as shown in FIG. 3 , and the right temporal region refers to the "position of the temporal region on the right side as seen from the subject," and the left temporal region refers to the "position of the temporal region on the left side as seen from the subject."

[0062] (Right Piece) The dividing line (A) 301 dividing the center piece 300 (first center piece 310, second center piece 320) and the right piece 340 passes between electrode positions Fp2 and F8, Fz and F4, Cz and C4, and T6 and T4. The right piece 340 covers electrode positions F4, F8, C4, and T4. Here, the right piece 340 has holes 341, 343, 342, and 344 at positions corresponding to electrode positions F4, F8, C4, and T4, respectively. The holes 341, 342, 343, and 344 each accommodate the support elastic member 130 described in the basic embodiment, and the EEG electrode member 120 is attached via the holding portion 180.

[0063] (Left Piece) The dividing line (B) 302 dividing the center piece 300 (first center piece 310, second center piece 320) and the left piece 330 passes between electrode positions Fp1 and F7, Fz and F3, Cz and C3, and T5 and T3. The left piece 330 covers electrode positions F3, F7, C3, and T3. Here, the left piece 330 has holes 331, 333, 332, and 334 at positions corresponding to electrode positions F3, F7, C3, and T3, respectively. The holes 331, 332, 333, and 334 each accommodate the support elastic member 130 described in the basic embodiment, and the EEG electrode member 120 is attached via the holding portion 180.

[0064] (Center Piece) The center piece 300 has a first center piece 310 on the forehead side and a second center piece 320 on the occipital side. A dividing line (C) 303 dividing the first center piece 310 and the second center piece 320 passes between the electrode positions Fp1 and Fz and between Fp2 and Fz. As shown in FIG. 10 , the center piece 300 has recessed housing portions 391 and 392 near the top of the head, which are arranged side by side on the left and right to accommodate the signal processing units 160a and 160b. In this specification, the term "forehead" refers to the position of the forehead on the subject's head 20 when the subject wears the EEG measurement device 10 of this embodiment on the head 20 as shown in FIG. 3 , and the term "forehead side" refers to "a position on the subject's head close to the forehead." In addition, in this specification, the occipital region means the position of the occipital region on the subject's head 20 when the subject wears the EEG measurement device 10 of this embodiment on the head 20 as shown in Figure 3, and the occipital side means "a position on the subject's head close to the occipital region."

[0065] The first central piece 310 covers the electrode positions Fp1 and Fp2. Note that, in this example, the EEG electrode members 120 are not attached to the first central piece 310, and therefore no holes for attaching the EEG electrode members 120 are provided. However, if the device is for measuring EEGs at the electrode positions Fp1 and Fp2, holes for attaching the EEG electrode members 120 may be provided at the electrode positions Fp1 and Fp2.

[0066] The second central piece 320 covers the electrode positions Fz, Cz, Pz, P3, P4, T5, T6, O1, and O2. The second central piece 320 has holes 321, 322, 323, 324, 325, 326, 327, 328, and 329 at positions corresponding to the electrode positions Fz, Cz, T5, P3, Pz, P4, T6, O1, and O2, respectively. The elastic support member 130 described in the basic embodiment is housed in each of the holes 321, 322, 323, 324, 325, 326, 327, 328, and 329, and the EEG electrode member 120 is attached via the holding portion 180.

[0067] (Connecting Portion) The individual pieces (first center piece 310, second center piece 320, left piece 330, right piece 340) of the divided support body 110 are connected by connecting portions 400. Here, "connected" refers to, for example, a state in which the relative positions of the pieces are adjustable within a predetermined range and the pieces are connected to each other. The connecting portions 400 preferably have a structure that connects the pieces and allows for easy adjustment of the connecting positions and clearances between the pieces. For example, hook-and-loop fasteners, belts, rubber bands, buckles, etc. can be suitably used, and hook-and-loop fasteners are preferred from the viewpoint of easier adjustment of the relative positions of the pieces. Furthermore, from the viewpoint of further improving the fit with the head 20, it is preferable to employ connecting portions 400 that are structured to allow movement of the pieces in the direction in which the cushioning material 500 described below contracts while suppressing movement of the pieces in the direction in which the cushioning material 500 expands (loosens). Furthermore, the connecting portions 400 used may all be the same type, or different types may be used. Here, an example in which hook-and-loop fasteners are provided on the outer surface of the support body 110 as the connecting portion 400 will be described.

[0068] As an example of the hook and loop fastener, a hook and loop fastener (A) having a surface A brushed into a hook shape (J hook) and a hook and loop fastener (B) having a surface B with densely packed loops hook and loop with each other or come off, and are connected and separated. In this embodiment, the hook and loop fastener (A) is fixed to the support 110 side, and the hook and loop fastener (B) is adhered from above to the hook and loop fastener (A) of the adjacent piece, thereby connecting the adjacent pieces.

[0069] (Connection between the first center piece and the left and right pieces) Specifically, in the example of Figure 10, a rectangular hook-and-loop fastener (A) 401 with its longitudinal direction in the width direction (left-right direction in Figure 10) is provided in the lower area of ​​the surface of the first center piece 310.

[0070] A rectangular hook-and-loop fastener (A) 402 is provided on the surface of the left piece 330, below the hole 331 that corresponds to electrode position F3. The hook-and-loop fastener (A) 401 of the first center piece 310 and the hook-and-loop fastener (A) 402 of the left piece 330 are adhered to the hook-and-loop fastener (B) 412. This connects the first center piece 310 and the left piece 330. The gap between the first center piece 310 and the left piece 330 can be adjusted by adjusting the adhesion positions of the hook-and-loop fasteners (A) 401, 402 and the hook-and-loop fastener (B) 412.

[0071] A rectangular hook-and-loop fastener (A) 403 is provided on the surface of the right piece 340, below the hole 341 that corresponds to electrode position F4. The hook-and-loop fastener (A) 401 of the first center piece 310 and the hook-and-loop fastener (A) 403 of the right piece 340 are adhered to the hook-and-loop fastener (B) 413. This connects the first center piece 310 and the right piece 340. The gap between the first center piece 310 and the right piece 340 can be adjusted by adjusting the adhesion positions of the hook-and-loop fasteners (A) 401, 403 and the hook-and-loop fastener (B) 413.

[0072] (Connection between the second center piece and the left and right pieces) On the surface of the second center piece 320, a hook-and-loop fastener (A) 406 is provided between the hole 321 corresponding to the electrode position Fz and the dividing line (A) 301, and a hook-and-loop fastener (A) 407 is provided between the hole 321 corresponding to the electrode position Fz and the dividing line (B) 302.

[0073] A rectangular hook-and-loop fastener (A) 404 is provided on the surface of the left piece 330 near a hole 332 corresponding to electrode position C3. The hook-and-loop fastener (A) 406 of the second center piece 320 and the hook-and-loop fastener (A) 404 of the left piece 330 are adhered to the hook-and-loop fastener (B) 414, thereby connecting the second center piece 320 and the left piece 330. The gap between the second center piece 320 and the left piece 330 can be adjusted by adjusting the adhesion positions of the hook-and-loop fasteners (A) 406, 404 and the hook-and-loop fastener (B) 414. The second center piece 320 and the left piece 330 are also connected on the back of the head side by hook-and-loop fasteners (A) and (B) (not shown).

[0074] A rectangular hook-and-loop fastener (A) 405 is provided on the surface of the right piece 340 near the hole 342 corresponding to electrode position C4. The hook-and-loop fastener (A) 407 of the second center piece 320 and the hook-and-loop fastener (A) 405 of the right piece 340 are adhered to the hook-and-loop fastener (B) 415, thereby connecting the second center piece 320 and the right piece 340. The gap between the second center piece 320 and the right piece 340 can be adjusted by adjusting the adhesion positions of the hook-and-loop fasteners (A) 407, 405 and the hook-and-loop fastener (B) 415. The second center piece 320 and the right piece 340 are also connected on the back of the head side by hook-and-loop fasteners (A) and (B) (not shown).

[0075] While the example in which the hook-and-loop fastener is provided on the outer surface (hereinafter referred to as the outer surface) of the support 110 has been described, the connecting portion 400 may also be provided on the inner surface (hereinafter referred to as the inner surface) of the support 110, on the outer surface of the support 110, or between the pieces (division lines (A) 301, (B) 302, and (C) 303). From the viewpoints of further suppressing noise due to contact with the EEG electrode member 120 and facilitating adjustment of the connecting portion, the connecting portion 400 is preferably provided on the outer surface (external surface) of the support 110. Furthermore, as described above, hook-and-loop fasteners are preferred from the viewpoint of facilitating adjustment of the relative positions of the pieces. Therefore, the connecting portion 400 is preferably a hook-and-loop fastener provided on the outer surface of the support 110.

[0076] (Cushioning material) Cushioning material 500 is provided between each piece of the divided support body 110. By providing the cushioning material 500, it is possible to prevent the pieces from coming into contact with each other. When the pieces come into contact with each other, vibrations caused by the contact can cause noise to be introduced into the detected brain waves, and providing the cushioning material 500 can prevent such noise. Here, the cushioning material 500 is provided in some of the gaps between the pieces (division line (A) 301, division line (B) 302, and division line (C) 303).

[0077] In the example of Fig. 10, cushioning material 500 is attached to the connecting parts 400 that connect the pieces, for example, by hook-and-loop fasteners, at positions between the pieces where the connecting parts 400 are provided. In other words, cushioning material 500 is attached to the connecting parts 400, and is thereby detachably provided with respect to the main body of support body 110. When adjacent pieces are brought close to each other by the connecting parts 400, cushioning material 500 is sandwiched between these adjacent pieces. In the following description, when there is no need to distinguish between cushioning materials 501 to 504, they will be collectively referred to as "cushioning material 500."

[0078] Specifically, a cushioning material 501 is provided between the first center piece 310 and the left piece 330 at the portion where the hook-and-loop fastener (A) 401 of the first center piece 310 and the hook-and-loop fastener (A) 402 of the left piece 330 are connected by the hook-and-loop fastener (B) 412.

[0079] A cushioning material 502 is provided between the first center piece 310 and the right piece 340 at the portion where the hook-and-loop fastener (A) 401 of the first center piece 310 and the hook-and-loop fastener (A) 403 of the right piece 340 are connected by the hook-and-loop fastener (B) 413.

[0080] A cushioning material 503 is provided between the second center piece 320 and the left piece 330 at the portion where the hook-and-loop fastener (A) 406 of the second center piece 320 and the hook-and-loop fastener (A) 404 of the left piece 330 are connected by the hook-and-loop fastener (B) 414.

[0081] A cushioning material 504 is provided between the second center piece 320 and the right piece 340 at the portion where the hook-and-loop fastener (A) 407 of the second center piece 320 and the hook-and-loop fastener (A) 405 of the right piece 340 are connected by the hook-and-loop fastener (B) 415.

[0082] Although not shown, the cushioning material 500 is also provided on the back of the head and in the portion connected by the hook-and-loop fastener. The cushioning material 500 is appropriately selected from materials of different sizes and hardness depending on the location where it is used and the shape of the head 20 of the person wearing the EEG measuring device 10. Also, it is not necessary to provide the cushioning material 500 between all the pieces. The cushioning material 500 may also have the function of the connecting portion 400.

[0083] The shape of the cushioning material 500 is not particularly limited, but can be, for example, a rectangular parallelepiped. The size can be, for example, 10 mm to 40 mm in length, 10 mm to 40 mm in width, and 1 mm to 25 mm in thickness. The lower limits of the length and width are preferably 10 mm or more, more preferably 20 mm or more. The upper limits are preferably 35 mm or less, more preferably 30 mm or less. The lower limit of the thickness is preferably 2 mm or more, more preferably 5 mm or more. The upper limit is preferably 20 mm or less, more preferably 15 mm or less. By setting the size of the cushioning material 500 within this range, it is possible to prevent the movement of one piece from being transmitted to other pieces. Although the cushioning material 500 may be provided across the entire space between each piece, it is preferable to provide it in three locations: the forehead, the parietal region, and the back of the head, from the viewpoint of preventing the movement of the temporal region from being transmitted to the pieces.

[0084] The material of the cushioning material 500 can be, for example, the elastic material exemplified for the support elastic member 130. The elastic material is, for example, one or more selected from urethane sponge, polyethylene sponge (polyethylene foam), polypropylene sponge, and rubber sponge (rubber foam).

[0085] The physical properties of the cushioning material 500 can be suitably defined, for example, by a compression SS curve. The deformation amount when a compressive load of 10 N is applied, measured by the following (method), is 0.5 mm or more and 9.5 mm or less. The lower limit of the deformation amount is preferably 1 mm or more, more preferably 2 mm or more. The upper limit is preferably 8 mm or less, more preferably 6 mm or less. The deformation amount is preferably 1 mm or more and 8 mm or less, more preferably 2 mm or more and 6 mm or less. By setting the range of physical properties in the compression SS curve of the cushioning material 500 to the above numerical ranges, the cushioning material 500 can appropriately absorb force when a force acts in a direction that brings the pieces closer together. (Method) A test piece of the cushioning material 500 of this embodiment (dimensions: length 50 mm x width 50 mm x height 10 mm) and a push-pull gauge (digital force gauge FGJN-2 manufactured by Nidec-Shimpo Corporation) equipped with a 20 mm diameter disc-shaped pressure piece were placed on a measurement table equipped with a displacement meter. The test piece is compressed by the pressure piece, and the position of the pressure piece is lowered by 0.2 mm, and this state is maintained for 20 seconds each time. After maintaining this state for 20 seconds, the compression load (N) is read, and an SS curve is created by repeatedly plotting the change in the position of the pressure piece (mm) on the x-axis and the compression load (N) on the y-axis. From the obtained SS curve, the change in the position of the pressure piece when a compression load of 10 N is applied is read and this is taken as the amount of deformation when a compression load of 10 N is applied.

[0086] FIG. 11 shows examples of compression SS curves for four types of cushioning materials used in the cushioning material 500. The following four types, A to D, are shown as materials used in the cushioning material 500. A: Polyethylene foam (1), manufactured by TRUSCO Corporation, product name "TPES" B: Polyethylene foam (2), manufactured by Sakai Chemical Industry Co., Ltd., product name "Minafoam" C: Low-resilience urethane, manufactured by ITEC Co., Ltd., product name "KTHU" D: Foam rubber, manufactured by Hikari Co., Ltd., product name "KSEP" The above materials A to D (and materials with similar physical properties) can be used as appropriate. Assuming a head load of approximately 40 N, it is preferable to use a material with a relatively low deformation rate among the materials in the above range rather than a material with an excessively large deformation rate. In the example shown in FIG. 11, material B (Polyethylene foam (2)) is the most preferable. Material C (Low-resilience urethane) has a large deformation rate, so it can be used when the head load is small, but it is preferable to avoid its use when the head load is large.

[0087] (Summary of the embodiment) The features of the embodiment can be briefly summarized as follows. 1. An electroencephalogram (EEG) measuring device 10 including: a support 110 divided into multiple pieces and attached to the head 20; an electrode unit (EEG electrode member 120) held by the support 110; a cushioning material 500 provided in the gaps between adjacent pieces; and a connecting portion 400 that determines the relative positions of the adjacent pieces. The multiple pieces are connected, and the size can be adjusted by changing the distance between the pieces. The cushioning material 500 between the pieces absorbs loads acting on the temporal side of the support 110, for example, when a subject undergoing EEG measurement changes position from supine to sideways. As a result, changes in the contact position of the EEG electrode member 120 can be suppressed. Furthermore, the connecting portion 400 facilitates adjustment of the distance between the pieces. 2. The electroencephalogram (EEG) measuring device 10 described in 1., wherein the connecting portion 400 is a hook-and-loop fastener provided on the outer surface of the support 110. Using a hook-and-loop fastener provided on the outer surface of the support 110 as the connecting portion 400 facilitates adjustment of the connection state. Furthermore, the hook-and-loop fastener can be configured with minimal irregularities. 3. The electroencephalogram (EEG) measuring device 10 described in 1. or 2., wherein the amount of deformation of the buffer material 500 when a compressive load of 10 N is applied is 0.5 mm or more and 9.5 mm or less, as measured by the following (method). (Method) A test piece of the buffer material 500 (dimensions: length 50 mm x width 50 mm x height 10 mm) and a push-pull gauge equipped with a 20 mm diameter disk-shaped pressure piece are placed on a measurement table equipped with a displacement meter. The test piece is compressed by the pressure piece, and the position of the pressure piece is lowered by 0.2 mm, and this state is maintained for 20 seconds. After maintaining this state for 20 seconds, the compression load (N) is read, and an SS curve is created by repeatedly plotting the change in the position of the pressure piece (mm) on the x-axis and the compression load (N) on the y-axis. From the obtained SS curve, the amount of change in the position of the pressure piece when a compressive load of 10 N is read and used as the amount of deformation when a compressive load of 10 N is applied. By employing cushioning material 500 with such physical properties, it is possible to appropriately absorb the force acting on support body 110 even when EEG measurement is performed in a sleeping position, such as when sleeping.4. The EEG measurement device 10 described in 1. or 2., in which the pieces include a central piece (first embodiment: first central piece 310, second central piece 320) facing the top of the head, a right piece (right piece 340) on the right side of the central piece (first central piece 310, second central piece 320), and a left piece 330 on the left side of the central piece (first central piece 310, second central piece 320). By dividing the support 110 in this manner, changes in the positional relationship between the EEG electrode member 120 and the scalp 22 (clearance between the inside of the support 110 and the head 20) are suppressed in response to changes in the subject's posture during measurement, such as while sleeping. As a result, stable EEG measurement can be achieved. 5. The EEG measurement device 10 described in 4. or 5., in which the right piece 340 and the left piece 330 each face at least the temporal region. The presence of a right piece 340 and a left piece 330 in the divided pieces prevents changes in the positional relationship between the EEG electrode member 120 and the scalp 22, even when the patient is lying on his / her side (lateral position) during sleep, etc. 6. The EEG measuring device 10 according to 4. or 5., wherein a dividing line (A) 301 dividing the central piece 300 (first central piece 310, second central piece 320) and the right piece 340 passes between Fp2 and F8, Fz and F4, Cz and C4, and T6 and T4 in the International 10-20 electrode placement method, and a dividing line (B) 302 dividing the central piece (first central piece 310, second central piece 320) and the left piece 330 passes between Fp1 and F7, Fz and F3, Cz and C3, and T5 and T3 in the International 10-20 electrode placement method. With this configuration, the first central piece 310 and the second central piece 320 move independently, preventing changes in the contact state between the EEG electrode member 120 and the scalp 22 from affecting the other piece. 7. The EEG measuring device 10 described in any one of 4. to 6., wherein the central pieces include a first central piece 310 on the frontal side and a second central piece 320 on the occipital side, and a dividing line (C) 303 dividing the first central piece 310 and the second central piece 320 passes between Fp1 and Fz and between Fp2 and Fz in the International 10-20 electrode placement method. With this configuration, the first central piece 310 and the second central piece 320 move independently.As a result, it is possible to prevent changes in the contact state between the EEG electrode member 120 and the scalp 22 in one piece from affecting the other piece.

[0088] This application claims priority based on Japanese Patent Application No. 2024-106676, filed July 2, 2024, the disclosure of which is incorporated herein by reference in its entirety.

[0089] REFERENCE SIGNS LIST 10 EEG measuring device 20 Head 22 Scalp 110 Support 111 Base 112 Covering member 114 Support through-hole 115 Hole 120 EEG electrode member 122 Base 123 Electrode convex portion 123a First portion 123b Conductive portion 123c Second portion 124 Conductive member 124a First portion 124b Second portion 125 Electrode body 126 Convex portion forming surface 127 Wiring 128 Upper surface 129 Cover 130 Support elastic member 131 Elastic member concave portion 132 Bottom surface 133 Upper surface 135 Elastic material through-hole 160 Signal processing unit 160a Signal processing unit 160b Signal processing unit 161 Reference potential measurement wiring 162 Circuit 163 Wiring 164 Conductive part 165 Wiring 170 Belt 180 Holding part 181 Base part 182 Convex part 183 Bottom surface 184 Top surface 185 First storage part 186 Second storage part 300 Center piece 301 Dividing line (A) 302 Dividing line (B) 303 Dividing line (C) 310 First center piece 320 Second center piece 321 to 329 Holes 330 Left piece 331 to 334 Holes 340 Right piece 341 to 344 Holes 400 Connecting part 401 to 407 Hook and loop fasteners (A) 412 to 415 Hook and loop fasteners (B) 500 Cushioning material 501 to 504 Cushioning material

Claims

1. An electroencephalogram (EEG) measuring device comprising: a support divided into multiple pieces to be worn on the head; an electrode unit held by the support; cushioning material provided in the gaps between adjacent pieces; and a connecting portion that determines the relative positions of the adjacent pieces.

2. An electroencephalogram measuring device as described in claim 1, wherein the connecting portion is a hook-and-loop fastener provided on the outer surface of the support.

3. An electroencephalogram measuring device as described in claim 1 or 2, wherein the deformation of the cushioning material when a compressive load of 10 N is applied is 0.5 mm or more and 9.5 mm or less, as measured by the following (method). (Method) A test piece of the cushioning material (dimensions: length 50 mm x width 50 mm x height 10 mm) and a push-pull gauge equipped with a disk-shaped pressure piece having a diameter of 20 mm were set on a measurement table having a displacement meter. The test piece is compressed by the pressure piece, the position of the pressure piece is lowered by 0.2 mm, and this state is maintained for 20 seconds each time. After maintaining this state for 20 seconds, the compression load (N) is read, and the amount of change in the position of the pressure piece (mm) is plotted on the x-axis and the compression load (N) is plotted on the y-axis to create an SS curve. From the obtained SS curve, the amount of change in the position of the pressure piece when a compression load of 10 N is applied is read and this is the amount of deformation when a compression load of 10 N is applied.

4. An electroencephalogram measuring device as described in any one of claims 1 to 3, wherein the plurality of pieces include a central piece facing the top of the head, a right piece to the right of the central piece, and a left piece to the left of the central piece.

5. The electroencephalogram measuring device according to claim 4, wherein the right piece and the left piece each face at least the temporal region of the head.

6. An electroencephalogram measuring device as claimed in claim 4 or 5, wherein dividing line (A) dividing the central piece and the right piece passes between Fp2 and F8, Fz and F4, Cz and C4, and T6 and T4 in the International 10-20 electrode placement method, and dividing line (B) dividing the central piece and the left piece passes between Fp1 and F7, Fz and F3, Cz and C3, and T5 and T3 in the International 10-20 electrode placement method.

7. An electroencephalogram measuring device according to any one of claims 4 to 6, wherein the central piece comprises a first central piece on the frontal side and a second central piece on the occipital side, and a dividing line (C) dividing the first central piece from the second central piece passes between Fp1 and Fz, and between Fp2 and Fz in the International 10-20 electrode placement method.

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