Electroencephalogram signal processing device, electroencephalogram signal processing system, and computer program

Abstract

To provide new visualization means of a brain activity state of a subject.SOLUTION: An input interface 121 receives a brain wave signal ES corresponding to a secular change of a brain activity potential of a subject, from each of a plurality of electrodes 110 which is attached to a head of the subject. A processor 122 processes the brain wave signal ES for acquiring a value of a brain wave parameter for each of the plurality of electrodes 110, and outputs visualization data VD for plotting the value on a radar chart. On the head, a plurality of regions to each of which at least one electrode is attached, is set, and each of a plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electroencephalogram signal processing system for quantifying and visualizing a subject's brain activity state with respect to a plurality of feature quantities. The present invention also relates to an electroencephalogram signal processing device included in the system, and a computer program executable by a processor mounted on the device. [Background technology]

[0002] Patent Document 1 discloses a technique for quantifying the activity state of a subject's brain with respect to a plurality of feature amounts and visualizing the activity state using an orthogonal coordinate system including a plurality of coordinate axes corresponding to the plurality of feature amounts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-046899 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a novel method for visualizing the brain activity state of a subject. [Means for solving the problem]

[0005] One aspect of the present invention to achieve the above object is an electroencephalogram signal processing device, comprising: an interface that receives electroencephalogram signals corresponding to changes over time in the brain activity potential of the subject from each of a plurality of electrodes attached to the head of the subject; a processor that processes the electroencephalogram signal to obtain electroencephalogram parameter values ​​for each of the plurality of electrodes and outputs data for plotting the values ​​on a radar chart; Equipped with A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of a plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions.

[0006] One aspect for achieving the above object is a computer program executable by a processor mounted on an electroencephalogram signal processing device, By being executed, the electroencephalogram signal processing device receiving electroencephalogram signals corresponding to changes over time in brain activity potentials of the subject from each of a plurality of electrodes attached to the subject's head; processing the electroencephalogram signal to obtain values ​​of electroencephalogram parameters for each of the plurality of electrodes; outputting data for plotting the values ​​of said electroencephalogram parameters on a radar chart; A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of a plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions.

[0007] One aspect of the present invention for achieving the above object is an electroencephalogram signal processing system, comprising: A plurality of electrodes attached to the subject's head; a signal processing device that processes an electroencephalogram signal corresponding to a time-dependent change in the brain action potential of the subject output from each of the plurality of electrodes to obtain an electroencephalogram parameter value for each of the plurality of electrodes; a visualization device for visualizing a radar chart on which the electroencephalogram parameter values ​​are plotted; Equipped with A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of a plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions.

[0008] According to the configurations of the above aspects, a novel method for visualizing brain activity can be provided in which the relative relationship between the values ​​of electroencephalogram parameters obtained for each of a plurality of regions set on the subject's head is shown on a radar chart. In other words, a user can examine the subject's brain activity state that can be read from the radar chart in association with position information in the brain. [Brief description of the drawings]

[0009] [Figure 1] 1 illustrates an example of the appearance of a headset included in an electroencephalogram signal processing system according to an embodiment. [Diagram 2] 2 illustrates an example of a functional configuration of an electroencephalogram signal processing system according to an embodiment. [Diagram 3] 3 shows an example of a radar chart visualized by the visualization device of FIG. 2. [Figure 4] 3 shows another example of a radar chart visualized by the visualization device of FIG. 2. [Diagram 5] 3 shows another example of a radar chart visualized by the visualization device of FIG. 2. [Figure 6] 3 shows another example of a radar chart visualized by the visualization device of FIG. 2. [Figure 7] 3 shows another example of a radar chart visualized by the visualization device of FIG. 2. [Figure 8] 3 shows another example of a radar chart visualized by the visualization device of FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Exemplary embodiments are described in detail below with reference to the accompanying drawings.

[0011] 1 illustrates an example of the appearance of a headset 11 included in an electroencephalogram signal processing system 10 (hereinafter, abbreviated as signal processing system 10) according to one embodiment. The headset 11 includes a first electrode 111, a second electrode 112, a third electrode 113, a fourth electrode 114, a fifth electrode 115, a sixth electrode 116, and a seventh electrode 117. In the following description, the first electrode 111, the second electrode 112, the third electrode 113, the fourth electrode 114, the fifth electrode 115, the sixth electrode 116, and the seventh electrode 117 are collectively referred to as "plurality of electrodes 110" as necessary.

[0012] The headset 11 is configured to be worn on the head of a subject. The first electrode 111, the second electrode 112, and the third electrode 113 are supported so as to be positioned on the left side of the subject's head when the headset 11 is worn. The fourth electrode 114, the fifth electrode 115, and the sixth electrode 116 are supported so as to be positioned on the right side of the subject's head when the headset 11 is worn. The seventh electrode 117 is supported so as to be positioned on the top of the subject's head when the headset 11 is worn.

[0013] 2, the positions of the first electrode 111, the second electrode 112, and the third electrode 113 are determined to be located at the F3 electrode position, the T3 electrode position, and the C3 electrode position, respectively, of the 10-20 system. The positions of the fourth electrode 114, the fifth electrode 115, and the sixth electrode 116 are determined to be located at the F4 electrode position, the T4 electrode position, and the C4 electrode position, respectively, of the 10-20 system. The position of the seventh electrode 117 is determined to be located at the Cz electrode position of the 10-20 system.

[0014] Each of the plurality of electrodes 110 is configured to detect an action potential at a corresponding location of the subject's brain through the opposing scalp, skull, cerebrospinal fluid, dura mater, etc. By detecting the brain action potential continuously over time, each electrode is configured to output an electroencephalogram signal ES corresponding to the change over time of the brain action potential. The electroencephalogram signal ES may be an analog signal or a digital signal.

[0015] The signal processing system 10 includes an electroencephalogram signal processing device 12 (hereinafter, abbreviated as the signal processing device 12). The signal processing device 12 may be built into the headset 11 illustrated in Fig. 1, or may be provided as a device independent of the headset 11. In the latter case, the electroencephalogram signal ES is transmitted from the headset 11 to the signal processing device 12 via wired or wireless communication.

[0016] The signal processing device 12 includes an input interface 121. The input interface 121 is configured to receive the electroencephalogram signal ES output from each of the multiple electrodes 110. When the electroencephalogram signal ES is an analog signal, the input interface 121 includes an appropriate conversion circuit including an A / D converter.

[0017] The signal processing device 12 includes a processor 122. The processor 122 is configured to process the electroencephalogram signal ES to obtain values ​​of electroencephalogram parameters for each of the multiple electrodes 110.

[0018] In this embodiment, the processor 122 is configured to perform a fast Fourier transform on the electroencephalogram signal ES output from each of the multiple electrodes 110, and acquire total power as an example of an electroencephalogram parameter. The fast Fourier transform is an example of a frequency analysis process. Examples of other electroencephalogram parameters that can be acquired through a frequency analysis process include an αδ ratio, an edge frequency, and power in a specific electroencephalogram frequency band. Examples of specific electroencephalograms include δ waves, θ waves, α waves, β waves, and γ waves.

[0019] The signal processing system 10 includes a visualization device 13. The visualization device 13 is configured to visualize a radar chart on which values ​​of a plurality of electroencephalogram parameters acquired by the signal processing device 12 are plotted. The visualization may be performed by displaying the radar chart on a display device such as a display, or by printing the radar chart via a printer or the like.

[0020] 3 illustrates a radar chart RC presented by the visualization device 13. The radar chart RC includes an F3 coordinate axis, a T3 coordinate axis, a C3 coordinate axis, an F4 coordinate axis, a T4 coordinate axis, and a C4 coordinate axis. The F3 coordinate axis, the T3 coordinate axis, the C3 coordinate axis, the F4 coordinate axis, the T4 coordinate axis, and the C4 coordinate axis correspond to the F3 electrode position, the T3 electrode position, the C3 electrode position, the F4 electrode position, the T4 electrode position, and the C4 electrode position, respectively. The F3 electrode position, the T3 electrode position, the C3 electrode position, the F4 electrode position, the T4 electrode position, and the C4 electrode position are examples of a plurality of regions set on the subject's head.

[0021] The total power value acquired based on the electroencephalogram signal ES output from the first electrode 111 is plotted on the F3 coordinate axis of the radar chart RC. The total power value acquired based on the electroencephalogram signal ES output from the second electrode 112 is plotted on the T3 coordinate axis of the radar chart RC. The total power value acquired based on the electroencephalogram signal ES output from the third electrode 113 is plotted on the C3 coordinate axis of the radar chart RC. The total power value acquired based on the electroencephalogram signal ES output from the fourth electrode 114 is plotted on the F4 coordinate axis of the radar chart RC. The total power value acquired based on the electroencephalogram signal ES output from the fifth electrode 115 is plotted on the T4 coordinate axis of the radar chart RC. The total power value acquired based on the electroencephalogram signal ES output from the sixth electrode 116 is plotted on the C4 coordinate axis of the radar chart RC.

[0022] 2, the signal processing device 12 includes an output interface 123. The processor 122 is configured to output visualization data VD from the output interface 123 for causing the visualization device 13 to provide the above-mentioned radar chart RC. The visualization data VD may be provided in the form of analog data or in the form of digital data. When the visualization data VD is provided in the form of analog data, the output interface 123 includes an appropriate conversion circuit including a D / A converter. The visualization device 13 is configured to visualize the radar chart RC based on the visualization data VD.

[0023] According to the above-mentioned configuration, it is possible to provide a novel method for visualizing brain activity, in which the relative relationship between the values ​​of electroencephalogram parameters obtained for each of a plurality of regions set on the subject's head is shown on a radar chart. In other words, the user can examine the subject's brain activity state that can be read from the radar chart in association with position information in the brain.

[0024] In this embodiment, the multiple regions associated with the multiple coordinate axes included in the radar chart RC are set symmetrically with respect to the subject's head. Therefore, the radar chart RC visualized by the visualization device 13 can include information about the symmetry of the distribution of the acquired electroencephalogram parameter values.

[0025] When the subject's brain activity state is normal, the distribution of the acquired electroencephalogram parameter values ​​generally shows symmetry between the left and right temporal regions. In other words, when the distribution of the total power value is asymmetric between the left and right temporal regions as illustrated in FIG. 3, an abnormality in the subject's brain activity state is suspected. For example, when an ischemic state caused by a stroke or the like occurs in the brain, an asymmetric distribution as illustrated in FIG. 3 is obtained. The user can intuitively obtain information related to such symmetry through the shape of a figure obtained by connecting multiple points plotted on the radar chart RC with lines. Therefore, it is possible to assist in determining the subject's brain activity state.

[0026] The processor 122 of the signal processing device 12 may be configured to acquire electroencephalogram parameter values ​​at multiple time points. The acquisition of the electroencephalogram parameter values ​​may be performed intermittently based on the electroencephalogram signal ES at the time when a predetermined time has elapsed, or statistical values ​​of the electroencephalogram parameters may be acquired every time the predetermined time elapses based on the electroencephalogram signal ES acquired continuously during the passage of the predetermined time. Examples of the statistical values ​​include an average value, a median value, and a mode value. The length of the predetermined time is appropriately set according to the brain activity state to be determined. Examples of units of the length of the predetermined time include minutes, hours, and days.

[0027] In this case, the processor 122 is configured to output, from the output interface 123, visualization data VD that causes the visualization device 13 to visualize the radar chart RC every time an electroencephalogram parameter value is acquired.

[0028] FIG. 4 illustrates a radar chart RC visualized based on electroencephalogram parameter values ​​acquired at multiple points in time. Black circles represent electroencephalogram parameter values ​​plotted through the latest acquisition process. Hatched circles represent electroencephalogram parameter values ​​plotted through the previous acquisition process. White circles represent electroencephalogram parameter values ​​plotted through the acquisition process before the previous one.

[0029] According to such a configuration, the change over time of the electroencephalogram parameter values ​​can be visualized on the radar chart RC. The user may be able to obtain an insight into the subject's brain activity state based on the change over time.

[0030] For example, the radar chart RC in FIG. 5 shows a time-dependent change in the total power value that decreases while maintaining a roughly bilateral symmetric distribution. Such a change can be considered a sign of overall deterioration in brain activity (e.g., brain death). Therefore, by referring to the time-dependent changes in the EEG parameter values, it is possible to assist in determining abnormalities in brain activity that cannot be determined solely from information on whether the distribution of the EEG parameter values ​​is symmetric between the left and right temporal regions.

[0031] Conversely, radar chart RC in Figure 6 shows a time-dependent increase in the total power value while maintaining a roughly symmetrical distribution. This type of change indicates a tendency for the subject's brain function to recover.

[0032] In the examples shown in Figures 4 to 6, electroencephalogram parameter values ​​acquired closer to the present are displayed with greater emphasis. Emphasis can be achieved by using different colors, line thicknesses, line types, shading, etc.

[0033] Such a configuration allows the user to more intuitively grasp the changes over time in the electroencephalogram parameter values, thereby improving support for determining abnormalities in the state of brain activity.

[0034] 7, in the visualization device 13, a plot related to an electroencephalogram parameter value acquired at a specific time point in the radar chart RC can be specified. In this case, the visualization device 13 can be configured to visualize the electroencephalogram signal ES acquired at the specified time point. The area including the electroencephalogram parameter value acquired at the specific time point in the radar chart RC is an example of a specific area in the radar chart.

[0035] 2, the signal processing system 10 may include a user interface 14. The user interface 14 may have an appropriate configuration for supporting the specification of a plot related to an electroencephalogram parameter value acquired at a specific time point in the radar chart RC visualized in the visualization device 13. The user interface 14 may be realized by a mouse, a pointer, a touch panel constituting a part of the visualization device 13, or the like.

[0036] When a plot relating to electroencephalogram parameter values ​​acquired at a particular time on the radar chart RC is identified, identification information SP indicating at what time the plot relating to the electroencephalogram parameter values ​​acquired is identified is transmitted from the user interface 14 to the signal processing device 12.

[0037] The signal processing device 12 is configured to store data corresponding to the electroencephalogram signal ES used in the process each time the electroencephalogram parameter value acquisition process is performed in the storage 124. The processor 122 reads out data corresponding to the electroencephalogram signal ES used in the electroencephalogram parameter value acquisition process performed at the time specified by the specification information SP received by the input interface 121 from the storage 124, and outputs visualization data VD for causing the visualization device 13 to visualize the electroencephalogram signal ES from the output interface 123. The visualization device 13 performs visualization of the electroencephalogram signal ES based on the visualization data VD, as exemplified in FIG.

[0038] With this configuration, if a user has a question or is interested in the information visualized as the radar chart RC, the user can immediately check the brain waves, which are the source of the information. This can improve the support for determining abnormalities in the brain activity state.

[0039] The above configuration can also be applied to the radar chart RC in FIG. 3 in which only electroencephalogram parameter values ​​relating to a single time point are visualized.

[0040] As illustrated in Fig. 8, in the visualization device 13, a specific coordinate axis in the radar chart RC can be specified. In this case, the visualization device 13 can be configured to visualize the electroencephalogram signal ES acquired through an electrode corresponding to the specified coordinate axis. The specific coordinate axis in the radar chart RC is an example of a specific region in the radar chart. There may be multiple coordinate axes specified.

[0041] In this case, when a particular coordinate axis on the radar chart RC is identified, identification information SP indicating which coordinate axis has been identified is transmitted from the user interface 14 to the signal processing device 12.

[0042] The processor 122 reads out data corresponding to the electroencephalogram signal ES acquired through the electrodes corresponding to the coordinate axes specified by the specification information SP received by the input interface 121 from the storage 124, and outputs visualization data VD from the output interface 123 for causing the visualization device 13 to visualize the electroencephalogram signal ES. The visualization device 13 performs visualization of the electroencephalogram signal ES based on the visualization data VD, as exemplified in Fig. 8.

[0043] Even with this configuration, if a user has questions or is interested in the information visualized as the radar chart RC, the user can immediately check the brain waves, which are the source of the information. This can improve the support for determining abnormalities in brain activity.

[0044] 8, a plurality of electroencephalogram signals ES acquired at different times are arranged vertically. However, a plurality of electroencephalogram signals ES may be displayed in a superimposed manner so as to share a time axis extending horizontally, and the display manner (type of line, shading of line, color of line, thickness of line, etc.) may be made different between the electroencephalogram signals ES, thereby making it possible to distinguish between the plurality of electroencephalogram signals ES acquired at different times.

[0045] The user interface 14 can be configured to allow any area on the radar chart RC to be specified. For example, an operation to surround any area on the radar chart RC can be performed through a cursor operation using a mouse or a touch operation on a touch panel.

[0046] In this case, the identification information SP includes information indicating which area in the radar chart RC has been identified. The processor 122 reads data corresponding to the electroencephalogram signal ES, which is the source of the values ​​of the electroencephalogram parameters included in the area identified by the identification information SP, from the storage 124, and outputs visualization data VD from the output interface 123 for causing the visualization device 13 to visualize the electroencephalogram signal ES. The visualization device 13 performs visualization of the electroencephalogram signal ES based on the visualization data VD.

[0047] Reference values ​​corresponding to the electroencephalogram parameter values ​​acquired based on the electroencephalogram signal ES of a healthy subject may be stored in the storage 124. Examples of the reference values ​​include electroencephalogram parameter values ​​acquired in advance when the brain activity of the subject to be compared is normal, average values ​​of electroencephalogram parameter values ​​acquired in advance for a plurality of healthy subjects, and electroencephalogram parameter values ​​that can be acquired from healthy subjects that are generally known in literature, etc.

[0048] In this case, the reference value may be plotted on a radar chart RC, as illustrated by the dashed line in Fig. 3. Specifically, the processor 122 reads out the reference values ​​from the storage 124, and outputs visualization data VD from the output interface 123 for causing the visualization device 13 to visualize the reference values.

[0049] According to this configuration, the acquired electroencephalogram parameter values ​​of the subject can be compared with the electroencephalogram parameter values ​​that would be acquired when the subject's brain activity state is normal, thereby improving the support for determining whether the subject's brain activity state is abnormal.

[0050] 2, the signal processing system 10 may include an alarm device 15. The alarm device 15 may be configured to notify a user that at least one of the electroencephalogram parameter values ​​visualized on the radar chart RC is abnormal. The alarm may be provided through at least one of a visual alarm, an auditory alarm, and a tactile alarm.

[0051] As one example, a notification may be issued when at least one of the electroencephalogram parameter values ​​falls outside a predetermined threshold range. As another example, a notification may be issued when an amount of change over time in at least one of the electroencephalogram parameter values ​​exceeds a threshold.

[0052] A notification may be issued when a statistical value obtained based on a plurality of electroencephalogram parameter values ​​falls outside a predetermined threshold range. Examples of the statistical value include a sum, average, maximum, and minimum value of the plurality of parameter values. A notification may be issued when a difference between a statistical value of the plurality of parameter values ​​obtained for the left temporal region and a statistical value of the plurality of parameter values ​​obtained for the right temporal region exceeds a threshold.

[0053] Specifically, the processor 122 of the signal processing device 12 judges whether a predetermined abnormal condition is satisfied every time an electroencephalogram parameter value is acquired. When it is judged that at least one electroencephalogram parameter value or a statistical value based on a plurality of electroencephalogram parameter values ​​satisfies the predetermined abnormal condition, the processor 122 outputs a control signal CT from the output interface 123 to cause the notification device 15 to execute a predetermined notification. The notification device 15 executes the notification based on the control signal CT.

[0054] With this configuration, when the subject's brain activity deviates or is beginning to deviate from the normal state, the user can be prompted to take prompt action.

[0055] The processor 122 of the signal processing device 12 having the various functions described above may be realized by a general-purpose microprocessor that operates in cooperation with a general-purpose memory. Examples of the general-purpose microprocessor include a CPU, an MPU, and a GPU. Examples of the general-purpose memory include a ROM and a RAM. In this case, the ROM may store a computer program that executes the above-mentioned processing. The ROM is an example of a non-transient computer-readable medium that stores a computer program. The general-purpose microprocessor specifies at least a part of the program stored on the ROM, deploys it on the RAM, and executes the above-mentioned processing in cooperation with the RAM. The computer program may be pre-installed in the general-purpose memory, or may be downloaded from an external server via a communication network and then installed in the general-purpose memory. In this case, the external server is an example of a non-transient computer-readable medium that stores a computer program. The storage 124 may be realized by the general-purpose memory.

[0056] The processor 122 of the signal processing device 12 having the various functions described above may be realized by a dedicated integrated circuit capable of executing the above computer program, such as a microcontroller, an ASIC, or an FPGA. In this case, the above computer program is pre-installed in a memory element included in the dedicated integrated circuit. The memory element is an example of a computer-readable medium that stores a computer program. The storage 124 may be realized by the memory element.

[0057] The processor 122 of the signal processing device 12 having the various functions described above can also be realized by a combination of a general-purpose microprocessor and a dedicated integrated circuit.

[0058] The above-described embodiment is merely an example for facilitating understanding of the present invention. The configurations according to the above-described embodiment may be appropriately modified or improved without departing from the spirit and scope of the present invention.

[0059] In the above embodiment, six regions are set on the subject's head, and the radar chart RC includes six coordinate axes. However, as long as the radar chart RC can be created, the number of regions can be changed as appropriate. For example, at least two of the multiple electrode positions according to the 10-20 method illustrated in FIG. 2 can be appropriately selected.

[0060] In the above embodiment, one electrode is associated with each of the multiple regions set on the subject's head. However, the number of electrodes associated with each region may be two or more. In this case, the electroencephalogram parameter values ​​provided for visualization on the radar chart RC in each region may be statistical values ​​based on the multiple electroencephalogram parameter values ​​acquired through the multiple electrodes. Examples of statistical values ​​include the average value, maximum value, minimum value, median value, and mode value.

[0061] In the above embodiment, the processor 122 of the signal processing device 12 acquires the electroencephalogram parameter values ​​based on the frequency analysis process. However, electroencephalogram parameter values ​​that can be acquired without the frequency analysis process may be provided for visualization on the radar chart RC. Examples of such electroencephalogram parameters include electroencephalogram amplitude, burst suppression, anesthesia depth, sedation level, artifacts, etc.

[0062] The signal processing device 12 and the visualization device 13 may be configured as a single device. For example, a biological information monitor that acquires and displays other vital parameters (blood pressure, body temperature, respiration, etc.) may have the functions of the signal processing device 12 and the visualization device 13 to realize the visualization method described above. Similarly, the signal processing device 12, the visualization device 13, and the notification device 15 may be configured as a single device.

[0063] The expression "at least one of A and B" used in this specification with respect to two entities A and B includes the cases where only A is specified, only B is specified, and both A and B are specified. Each entity A and B may be singular or plural unless otherwise specified.

[0064] The expression "at least one of A, B, and C" used in this specification with respect to three entities A, B, and C means a case where only A is specified, a case where only B is specified, a case where only C is specified, a case where A and B are specified, a case where B and C are specified, a case where A and C are specified, and a case where all of A, B, and C are specified. Each of the entities A, B, and C may be singular or plural unless otherwise specified. The same applies to a case where the number of entities to be described is four or more. [Explanation of symbols]

[0065] 10: EEG signal processing system, 110: multiple electrodes, 12: EEG signal processing device, 121: input interface, 122: processor, 124: storage, 13: visualization device, 15: notification device, ES: EEG signal, RC: radar chart, VD: visualization data

Claims

1. an interface that receives electroencephalogram signals corresponding to changes over time in the brain activity potential of the subject from each of a plurality of electrodes attached to the head of the subject; a processor that processes the electroencephalogram signal to obtain values ​​of electroencephalogram parameters for each of the plurality of electrodes at a plurality of time points and outputs data for plotting changes in the values ​​over time on a radar chart; Equipped with A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of the plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions. EEG signal processing device.

2. The plurality of regions are set symmetrically with respect to the head. The electroencephalogram signal processing device according to claim 1 .

3. the processor outputs data for plotting on the radar chart such that values ​​of the electroencephalogram parameters acquired at points closer to the present are more emphasized. The electroencephalogram signal processing device according to claim 1 .

4. An interface that receives electroencephalogram signals corresponding to changes over time in the brain activity potential of a subject from each of a plurality of electrodes attached to the subject's head; a processor that processes the electroencephalogram signal to obtain electroencephalogram parameter values ​​for each of the plurality of electrodes and outputs data for plotting the values ​​on a radar chart; a storage for storing data corresponding to the electroencephalogram signals; Equipped with A plurality of regions are provided on the head, each of which is fitted with at least one electrode; each of a plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions; When information specifying a specific area on the radar chart is received by the interface, the processor reads out data corresponding to the electroencephalogram signal used to acquire the value of the electroencephalogram parameter included in the specific area from the storage, and outputs data for visualizing the electroencephalogram signal. EEG signal processing device.

5. The electroencephalogram signal processing device according to claim 4 , wherein the specific region corresponds to a specific time point at which the value of the electroencephalogram parameter was acquired.

6. The specific region corresponds to at least one of the plurality of regions set for the head. The electroencephalogram signal processing device according to claim 4 .

7. a storage device for storing reference values ​​corresponding to the electroencephalogram parameters obtained based on the electroencephalogram signals of a healthy subject; the processor outputs data for plotting the reference value on the radar chart. The electroencephalogram signal processing device according to any one of claims 1 to 6.

8. The processor outputs a control signal to an alarm device to notify that the electroencephalogram parameter value is not normal. The electroencephalogram signal processing device according to any one of claims 1 to 7.

9. The processor performs a frequency analysis process on the electroencephalogram signal to obtain values ​​of the electroencephalogram parameters. The electroencephalogram signal processing device according to any one of claims 1 to 8.

10. A computer program executable by a processor mounted in an electroencephalogram signal processing device, By being executed, the electroencephalogram signal processing device receiving electroencephalogram signals corresponding to changes over time in brain activity potentials of the subject from each of a plurality of electrodes attached to the subject's head; processing the electroencephalogram signal to obtain values ​​of electroencephalogram parameters for each of the plurality of electrodes at a plurality of time points; outputting data for plotting the time-dependent changes in the values ​​of the electroencephalogram parameters on a radar chart; A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of the plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions. Computer program.

11. A plurality of electrodes attached to the subject's head; a signal processing device that processes an electroencephalogram signal corresponding to a time-dependent change in the brain activity potential of the subject output from each of the plurality of electrodes to obtain values ​​of electroencephalogram parameters for each of the plurality of electrodes at a plurality of time points; a visualization device for visualizing a radar chart on which the changes in the values ​​of the electroencephalogram parameters over time are plotted; Equipped with A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of the plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions. EEG signal processing system.

12. A computer program executable by a processor mounted on an electroencephalogram signal processing device, comprising: By being executed, the electroencephalogram signal processing device receiving electroencephalogram signals corresponding to changes over time in brain activity potentials of the subject from each of a plurality of electrodes attached to the subject's head; storing data corresponding to the electroencephalogram signal in a storage device; processing the electroencephalogram signal to obtain values ​​of electroencephalogram parameters for each of the plurality of electrodes; outputting data for plotting the values ​​of said electroencephalogram parameters on a radar chart; when receiving information specifying a specific area on the radar chart, reading from the storage data corresponding to the electroencephalogram signal used to acquire the value of the electroencephalogram parameter included in the specific area, and outputting data for visualizing the electroencephalogram signal; A plurality of regions are provided on the head, each of which is fitted with at least one electrode; Each of the plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions. Computer program.

13. A plurality of electrodes attached to the subject's head; a signal processing device that processes an electroencephalogram signal corresponding to a time-dependent change in the brain action potential of the subject output from each of the plurality of electrodes to obtain an electroencephalogram parameter value for each of the plurality of electrodes; a storage for storing data corresponding to the electroencephalogram signals; a visualization device for visualizing a radar chart on which the electroencephalogram parameter values ​​are plotted; Equipped with A plurality of regions are provided on the head, each of which is fitted with at least one electrode; each of a plurality of coordinate axes included in the radar chart corresponds to one of the plurality of regions; When the signal processing device receives information specifying a specific area on the radar chart, the signal processing device reads out data corresponding to the electroencephalogram signal used to acquire the value of the electroencephalogram parameter included in the specific area from the storage device, and outputs data for visualizing the electroencephalogram signal on the visualization device. EEG signal processing system.

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