JP6721818B2 - Brain activity amount determination device and program by expanding pupil diameter - Google Patents

Description

The present invention relates to a brain activity amount determination device and a program that utilize the fact that the pupil diameter increases when the human brain is activated.

Conventionally, electroencephalogram measurement has been performed to determine the activity level of the brain. In this case, it is necessary to surely bring several contact points into contact with the head, but this is a heavy burden on the subject and the measurement environment is limited.
Further, a brain defect such as dementia is determined by measuring the amount of the brain by physical imaging of the brain by MRI or the like, but an expensive MRI imaging device and specialized diagnosis are required.

On the other hand, for example, Non-Patent Document 1 discloses that the size of the brain activity of the subject is reflected in the pupil diameter. Further, for example, in Patent Documents 1 and 2, by utilizing the fact that the pupil diameter increases when a viewer focuses on the visual target, the pupil diameter is measured to determine the degree of attention to the visual target. The technology is disclosed.
The pupil diameter reflects not only the degree of attention to the visual target but also the magnitude of the brain activity of the subject.

Japanese Patent No. 5445981 International Publication No. 2015/056742

E. H. Hess, "Attitude and Pupil Size" Scientific American, Vol. 212.1965

However, in Non-Patent Document 1 described above, in addition to the fact that the pupil diameter as described in Patent Documents 1 and 2 determines the degree of attention to the visual target, the pupil diameter is the brain of the subject. It is only disclosed that it reflects the magnitude of the activity of the brain, and at that time, it is not possible to objectively express the magnitude of the stimulus, which is how much the brain is stimulated. The level could not be shown quantitatively.

The present invention has been made to solve the above problems, by measuring the pupil diameter of the subject, a brain activity amount determination device that can quantitatively show the activity level of the brain of the subject, and The purpose is to provide the program.

In order to achieve the above object, the brain activity amount determination device according to claim 1 determines the brain activity level of the subject based on the pupil diameter of the subject whose brain is active with respect to the object. A receiving unit that receives a pupil diameter A of the subject under normal conditions, a pupil diameter B of when the subject's brain is most active, and a pupil diameter C when the subject performs a specific stimulating activity. Based on the pupil diameter A of the subject in normal times received by the receiving unit, the pupil diameter B when the subject's brain is most active, and the pupil diameter C when the subject performs a specific stimulation activity. And a calculation unit that calculates a numerical value of the activity level of the brain when the subject performs a specific stimulating activity.

The brain activity determination device according to claim 2 is the brain activity determination device according to claim 1, wherein the calculation unit calculates the pupil diameter B when the brain of the subject is most active and the normal condition of the subject. The difference between the pupil diameter A of the subject is calculated as the maximum activity width S1 of the subject, and the difference between the pupil diameter C when the subject performs a specific stimulation activity and the pupil diameter A of the subject under normal conditions is the stimulation width of the subject. It is calculated as L1, and the numerical value of the activity level of the brain when the subject performs a specific stimulation activity is calculated based on the maximum activity width S1 of the subject and the stimulation width L1 of the subject.

The brain activity determination device according to claim 3 is the brain activity determination device according to claim 1, wherein the calculation unit further includes a pupil diameter B when the brain of the subject is most active and the normal time. If the difference in the pupil diameter A is less than the difference between the pupil diameter when the average human brain is most active calculated from the pupil diameters of a plurality of subjects and the average pupil diameter of the average human brain In addition, the specific stimulating activity is determined to be in a stress state.

Further, the brain activity amount determination device according to claim 4 is the brain activity amount determination device according to claim 1, further comprising an accumulating unit, wherein the receiving unit has a normal pupil diameter A of the subject, and the subject. The pupil diameter B when the brain is most active, and the pupil diameter C when the subject performs a specific stimulation activity, as well as the pupil diameter P1 when the subject looks at the darkest object. The subject receives the pupil diameter P2 when the subject looks at the brightest object, and the storage unit calculates the average of the pupil diameters of a plurality of subjects within a predetermined range based on the age of the subject. The normal human pupil diameter, the average human brain's most active pupil diameter, the average human's darkest pupil diameter, and the average human's pupil diameter. The pupil diameter when looking at the brightest object is accumulated, and the calculation unit calculates the difference between the pupil diameter B when the brain of the subject is most active and the pupil diameter A when the subject is normal. The maximum activity width S1 of the subject is calculated, and the difference between the pupil diameter P1 when the subject looks at the darkest target and the pupil diameter P2 when the subject looks at the brightest target is the maximum of the subject. The amount of change P is calculated, and the result of dividing the maximum activity width S1 of the subject by the maximum amount of change P of the subject is calculated as the adjusted maximum activity width S of the subject, and the average human brain is most active. The difference between the pupil diameter at the time of doing and the average human normal pupil diameter is calculated as the maximum activity width of the average human, and the pupil when the average human looks at the darkest target object. The difference between the diameter and the pupil diameter when the average human sees the brightest object is calculated as the maximum change amount of the average human, and the maximum activity width of the average human is the average. The result of dividing by the maximum change amount of the human being is calculated as the average adjusted maximum activity width of the human, and the result of dividing the adjusted maximum activity width S of the subject by the average adjusted maximum activity width of the human being, It is characterized in that it is calculated as a numerical value of the degree of cognition of the subject or a numerical value of the degree of depression of the subject.

Further, the brain activity amount determination device according to claim 5 is the brain activity amount determination device according to claim 1, wherein the brain activity amount determination device is the brain of the test subject regarding sight, hearing, smell, taste, or touch. It is characterized by determining an activity level.

Further, the program according to claim 6 is a program for determining the activity level of the brain of the subject based on the pupil diameter of the subject in which the brain is active with respect to the object, and the computer Receiving a pupil diameter A, a pupil diameter B when the subject's brain is most active, and a pupil diameter C when the subject has performed a specific stimulating activity, and the received normal pupil of the subject. Based on the diameter A, the pupil diameter B when the subject's brain is most active, and the pupil diameter C when the subject performs a specific stimulating activity, the brain of the subject when performing a specific stimulating activity is calculated. And a step of calculating a numerical value of the activity level.

According to this invention, the activity level of the brain of the subject can be quantitatively shown by measuring the pupil diameter of the subject, so that the magnitude of the stimulus, which is how much the brain is stimulated, can be objectively measured. Can be represented.

FIG. 1 is a schematic diagram showing a configuration example of a brain activity level determination system including a brain activity level determination device according to an embodiment of the present invention. It is a block diagram showing an example of composition of a brain activity amount judging device by an embodiment of the present invention. It is a flowchart which shows the whole process of the brain activity level determination system containing the brain activity amount determination apparatus in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is characterized by quantitatively indicating the activity level of the brain of the subject by measuring the pupil diameter of the subject by utilizing the fact that the pupil diameter is enlarged when the human brain is activated. This makes it possible to objectively express the magnitude of the stimulus, which is how much the brain is receiving.

In humans, when the brain is active, the pupil diameter increases. The human brain is activated by not only thinking (1) but also stimulation by the human five senses (2) to (6). Therefore, the pupil diameter changes depending on the size of the stimulus.
In other words, the level of expansion of the subject's pupil diameter can quantitatively show the activity level of the subject's brain, and can objectively represent the magnitude of the stimulus, such as how much the brain is being stimulated. is there.

Here, as specific examples of typical stimuli that the brain activates, (1) thinking activities (calculation, reading, games, memory tests, finding mistakes, conversation, etc.), (2) sniffing a stimulating scent, ( 3) Enjoy a tasteful taste (eat), (4) Impact sound, listen to music, (5) Touch (touch a specific object), (6) Visual (see a specific object), etc. There is.

FIG. 1 is a schematic diagram showing a configuration example of a brain activity level determination system including a brain activity amount determination device according to an embodiment of the present invention. Here, as a typical stimulus for activating the brain, the case of (6) vision described above will be described as an example. The brain activity level determination system shown in FIG. 1 is configured to include a brain activity amount determination device 100, a luminance measurement device 3, an eyeball photographing device 4, a visual scene photographing device 5, headphones 6, a transmitting device 7, and a storage device 8. It

The visual recognition scene photographing device 5 photographs a scene including an object (visual confirmation target, stimulation target) 2 visually recognized by the subject (visual observer) 1, that is, a visual recognition image a, and transmits the visual image a to the storage device 8. At the same time, the brightness measuring device 3 measures the brightness of the object (visual recognition target, stimulation target) 2 visually recognized by the subject (viewer) 1, that is, the brightness data c, and transmits it to the storage device 8.

The eyeball photographing device 4 photographs an eyeball of a subject (viewer) 1, and an eye movement for measuring a pupil diameter e when the subject (viewer) 1 visually recognizes an object (visual recognition target, stimulation target) 2. The image b is acquired, the pupil diameter e is calculated, and the eye movement image b and the pupil diameter e are transmitted to the storage device 8. The eye movement image b includes viewpoint data for calculating the viewpoint position of the subject (viewer) 1 with respect to the elapsed time. Therefore, the eyeball photographing device 4 can also calculate the viewpoint position of the subject (viewer) 1 with respect to the elapsed time. The headphone 6 acquires a voice stimulus for the subject (viewer) 1, that is, the voice data d, and transmits the voice data d to the storage device 8.

As a result, the visual image a obtained by the visual scene photographing device 5, the eye movement image b obtained by the eyeball photographing device 4, the luminance data c obtained by the luminance measuring device 3, and the audio data d obtained by the headphones 6 , And the pupil diameter e calculated by the eyeball photographing device 4 is accumulated in the accumulation device 8, and these data are transmitted by the transmission device 7 to the brain activity amount determination device 100.

Although the pupil diameter is affected by the luminance of the visual target, there is a method of removing the influence of the luminance of the visual target of the pupil diameter. This is to measure the pupil diameter of the subject on the basic light-dark screen in advance, create a relationship between the luminance and the pupil diameter as a table of the basic pupil diameter, measure the luminance of the actual visual target, and measure the basic luminance corresponding to that luminance. By comparing the pupil diameter with the pupil diameter when the actual visual recognition target is visually recognized, the influence of the luminance of the visual recognition target is removed. A method for removing the influence of the luminance of the visual object of the pupil diameter is described in Patent Documents 1, 2 and the like, and therefore detailed description thereof is omitted here.

FIG. 2 is a block diagram showing a configuration example of the brain activity amount determination device according to the embodiment of the present invention. The brain activity amount determination device 100 is a device that determines the activity level of the brain of the subject based on the pupil diameter of the subject in which the brain is active with respect to the object, and the receiving unit 101, the analysis unit 102, the storage unit 103, The diagnostic unit (calculation unit) 104 and the display unit 105 are provided.

The receiving unit 101 is a receiving unit that acquires at least the subject's eye movement image data and the subject's brightness data for the subject. In this embodiment, the visual image a and the eye movement image transmitted by the transmitting device 7 are transmitted. b, luminance data c, voice data d, and pupil diameter e are received, and these data are output to the analysis unit 102.

The analysis unit 102 acquires the visual image a, the eye movement image b, the luminance data c, the audio data d, and the pupil diameter e from the reception unit 101, and when these data are synchronized, stores them in the storage unit 103 as they are. If they are not synchronized, they are synchronized based on the synchronization signal data attached to the data, and these synchronized data are stored in the storage unit 103 together with the synchronization signal data.

The accumulation unit 103 stores the pupil diameters of a plurality of subjects, the average human pupil diameter calculated from the plurality of subject pupil diameters, and the average human pupil pupil diameter when the brain is most active. Etc. are accumulated. In addition, the average human normal pupil diameter calculated from the pupil diameters of a plurality of subjects within the predetermined range based on the age of a predetermined subject, when the average human brain is most active The pupil diameter, the pupil diameter when the average human sees the darkest target object, and the pupil diameter when the average human sees the brightest target object are accumulated.

The diagnosis unit 104 analyzes the analysis value by the analysis unit 102 (the normal pupil diameter A of the subject calculated by the analysis unit, the pupil diameter B when the brain of the subject is most active, the specific stimulation activity of the subject). The pupil diameter C at the time of performing. The pupil diameters A, B, and C will be described later), and the average human normal pupil diameter (normal value) stored and accumulated in the accumulation unit 103 and the average. Based on the pupil diameter (moving value) when the human brain is most active, the brain activity level when the subject (viewer) 1 performs a specific stimulation activity is used as objective numerical data or quantified data. By calculating, it is determined what the specific stimulation activity is, and the diagnostic result is output to the display unit 105.

The display unit 105 outputs (displays) the activity level of the brain of the subject calculated and determined by the diagnosis unit 104 as objective numerical data or quantified data. Specifically, in order to objectively represent the magnitude of the stimulus, which is how much the brain of the subject (viewer) 1 receives, based on the diagnostic result obtained from the diagnostic unit 104, it was quantified. Output as objective numerical data or quantified data such as data display and display in a contrasting format that can be seen at a glance with graphs and tables.
In this embodiment, the case of output by displaying on the display unit 105 will be described as an example, but as long as objective quantified data or quantified data can be presented, the output unit 105 by voice or the like. May be

In addition, here, it is described that the pupil diameter e is calculated by the eyeball photographing device 4 and sent to the brain activity amount determination device 100 as data, but the reception unit 101 causes the visual image transmitted by the transmission device 7. a, the eye movement image b, the luminance data c, and the audio data d are received, and these data are output to the analysis unit 102. In the analysis unit 102, the viewpoint of the subject (viewer) 1 with respect to the pupil diameter e and the elapsed time. The position may be calculated. In this case, the analyzing unit 102 determines, based on the eye movement image data and the brightness data acquired by the receiving unit 101, the normal pupil diameter A of the subject, the pupil diameter B when the brain of the subject is most active, and the subject The pupil diameter C when a specific stimulating activity is performed is calculated (the pupil diameters A, B, and C will be described later).

Furthermore, for example, the brain activity determination device 100 may be connected to a network such as the Internet. An external device connected to the brain activity determination device 100 outputs various data acquired by the analysis unit 102 of the brain activity determination device 100 or various data stored in the storage unit 103 from the brain activity determination device 100. The reception is performed, the same processing as the diagnosis unit 104 is performed, and the diagnosis result is transmitted to the brain activity amount determination device 100. In this case, the brain activity amount determination device 100 receives data and instructions from an external device via a network, and performs processing such as diagnosis and display based on the data and instructions. It is also possible to transmit the processing result to an external device via the network and display it on the external device.

Here, as described above, typical stimuli that activate the brain include not only thought (1) but also the five senses (2) to (6). (1) Thinking activities (calculation, reading, games, memory tests, mistake-finding, conversation, etc.), (2) Smelling stimulating scents, (3) Taste with impact (eat), (4) Sound with impact, listening to music, (5) tactile sense (touching a specific object), (6) visual sense (seeing a specific object).

FIG. 3 is a flowchart showing the overall processing of the brain activity level determination system including the brain activity amount determination device according to the embodiment of the present invention. The entire processing operation of the brain activity level determination system including the brain activity level determination apparatus 100 will be described using this flowchart.

First, the brightness Q of the target object (stimulation target) 2 for the subject 1 is measured in advance (step ST1). In this case, the target object (stimulation target) 2 is (1) a thinking target (a calculation sheet, a reading book, a game screen, a memory test, an error search, etc., and a thinking environment when there is no physical target), ( 2) an object to sniff, (3) a taste object, (4) an object or environment to hear a sound, (5) a tactile object, (6) a visual object, etc. Here, it is assumed that the target object (stimulation target) 2 is (6) a visual target, specifically, a display.

In step ST1, the luminance Q of the target object (visual recognition target, stimulation target) 2 is measured, and at the same time, the test subject 1 is not yet stimulated and the display which is the target object (visual recognition target, stimulation target) 2 is not considered. For a certain length of time (for example, 1 minute or more), after which the pupil diameter (normal pupil diameter) A is measured. That is, the pupil diameter A of the subject 1 under normal conditions is measured in the environment of brightness Q (step ST2). This is because the degree of attention is high immediately after the subject 1 sees the target object (visual target, stimulus target) 2 and it is not normal, so after a while, the pupil diameter is measured and this is measured in normal times. This is for setting the pupil diameter.

Even before the subject 1 is stimulated, the object (visual recognition target, stimulation target) 2 may affect the thinking of the subject 1 to some extent. The brightness (cd/m ² ) of the wall is adjusted to have the same brightness Q as that of the stimulus target and the environment of the stimulus to be visually recognized, and the pupil diameter of the subject 1 at that time is measured to obtain the normal pupil diameter A. Good. At this time, the brain of the subject 1 is not working much, and the pupil diameter is the normal pupil diameter A at the brightness.

Then, in a room with a specific brightness Q, the subject 1 is asked to see the display (object 2) when the darkest screen K1 is displayed, and the pupil diameter P1 at that time and the display (object 2) when the brightest screen K2 is displayed. Observe the object 2) and measure the pupil diameter P2 at that time. That is, in the environment of brightness Q, the subject 1 measures the pupil diameter P1 when looking at the darkest screen K1 and the pupil diameter P2 when looking at the brightest screen K2 (step ST3).

In this case, the maximum change amount P of the pupil diameter of the subject 1 is the difference between P1 and P2.
[Formula 1]
P=P1-P2
This value (amount of change in pupil diameter) changes with age, and decreases as the age increases.

Next, in the environment of the brightness Q of the target object (visual recognition target, stimulation target) 2, the brain activity of the subject 1 is the most active, for example, calculation is performed as soon as possible, the maze is solved, a memory test is performed, and a mistake is searched for. The pupil diameter B when the brain is maximally active is measured by having the person take the action such as "do". That is, the pupil diameter B when the brain of the subject 1 is most active in the environment of the brightness Q is measured (step ST4).

In this case, the maximum activity width S1 of the brain of the subject 1 is the difference between the pupil diameter B when the brain is most active at the same brightness Q and the pupil diameter A during normal times.
[Formula 2]
S1=B-A
This value (brain activity range) varies depending on age and individual.

Therefore, in order to eliminate age difference and individual difference, the adjustment maximum activity width S of the brain of the subject 1 is calculated by dividing by the maximum change amount P of the pupil diameter.
[Formula 3]
S=S1/P
This value represents the ratio of the pupil diameter at the maximum activity of the brain to the maximum change P of the pupil diameter, and is a value corrected for age difference and individual difference. If this value is small, it can be said that the amount of brain activity is small.

Next, the pupil diameter C when the subject 1 performs a specific stimulating activity on the target object (visual recognition target, stimulation target) 2 with the same brightness Q described above is measured (step ST5). Here, for example, it is assumed that the subject 1 pays attention to the image on the display (object 2) and the pupil diameter is measured when the image on the display (object 2) is viewed.

In this case, the stimulus width L1 of the brain of the subject 1 is the pupil diameter C when the subject 1 performs a specific stimulating activity on the object (visual recognition target, stimulation target) 2 with the same brightness Q and the normal pupil diameter. It is the difference from A.
[Formula 4]
L1=CA
This value (brain stimulation width) becomes 0 (zero) when there is no impact of stimulation. This value also differs according to age and individual.

Therefore, in order to eliminate the age difference and the individual difference, the adjustment stimulus width L of the brain of the subject 1 is calculated by dividing by the maximum change amount P of the pupil diameter.
[Formula 5]
L=L1/P
This value represents the ratio of the pupil diameter when the brain is active with respect to the object (visual recognition target, stimulation target) 2 with respect to the maximum change P of the pupil diameter, and is a value in which age differences and individual differences are corrected. When this value is small, it can be said that the impact of brain stimulation is small.

Further, as the brain activity level R of the subject 1, in the environment of the same brightness Q, the brain adjustment maximum activity width S calculated and corrected (adjusted) by the pupil diameter B when the brain is most active, and specified. The ratio of the adjusted stimulation width L of the brain calculated by the pupil diameter C at the time of stimulation and corrected (adjusted) can be determined by the following formula 6. The activity level of the brain according to this equation is R1.
[Formula 6]
R1=L/S=L1/S1=(C−A)/(B−A)

Similarly, as the activity level R of the brain of the subject 1, in the environment of the same brightness Q, the ratio of the pupil diameter C at the time of stimulating activity and the pupil diameter A at normal times is determined by the following mathematical formula 7. It is also possible. The activity level of the brain according to this equation is R2.
[Formula 7]
R2=C/A
To correct both the numerator and the denominator, this value is divided by the maximum change amount P of the pupil diameter, and the division calculation is performed in the same dimension. Therefore, it is considered that there is no age difference or individual difference.

As described above, the brain activity level R of the subject 1 is calculated using Equations 1 to 7, that is, based on the pupil diameters A, P1, P2, B, and C measured in steps ST2 to ST5. The determination is made (step ST6).
The activity level R of the brain can be quantified by these measurement methods, calculation methods, and determination methods. Therefore, for example, the following determinations (A) to (D) can be made or diagnosed specifically. it can.

(A) When the user feels stress, he/she actively activates his/her brain. Therefore, the degree of stress is objectively quantified by the magnitudes of the activity levels R1 and R2 of the brain calculated by the formulas 6 and 7. It can be quantified.
That is, the adjusted maximum activity width S, which is the difference between the pupil diameter B when the brain of the subject 1 is most active and the pupil diameter A during normal operation, is set to a predetermined value based on the objective numerical data or quantified data. (For example, the difference between the pupil diameter when the average human brain is most active calculated from the pupil diameters of multiple subjects and the average pupil diameter when the average human brain is normal) It is possible to determine that the stimulatory activity is in a stress state and the degree of the stress.

(B) It is known that the brain activity of the dementia patient is low, and the adjustment maximum activity width S of the brain is calculated from the pupil diameter of the subject within the predetermined range based on the age of the dementia patient. The degree H of the cognition can be quantified by the ratio with the average value of the averaged human beings. In this case, the average value of each of the subjects whose age is within the predetermined range based on the age of the dementia patient is calculated using the mathematical expressions 1 to 3.
[Formula 8]
H=S/(average value of S of people of the same age group)
If H<1, it can be determined that the brain activity is lower than that of a general person, and a person with a smaller H can be used as a reference for determining that dementia is more severe.

(C) It is known that the function of the brain is lowered even in the depressed state, and in this case also, the value of H calculated by the mathematical formula 8 serves as a reference for determining the degree of the depressed state.
That is, the adjusted maximum activity width S, which is the difference between the pupil diameter B when the brain of the subject 1 is most active and the pupil diameter A during normal operation, is based on the objective numerically or quantified data. When the subject 1 is a patient with dementia, the degree of dementia is calculated according to the ratio with the difference in the pupil diameter of the average human brain in Equation 8 when it is lower than the difference in the pupil diameter of the human brain. When the subject 1 is a depressed patient, the degree of the depression can be determined.

(D) The impact levels of the five senses of sight, hearing, smell, taste, and touch such as sound, scent, and taste are quantitatively determined by the magnitudes of the activity levels R1 and R2 of the brain calculated by Equations 6 and 7. Can be judged. Specifically, in the case of sound, the sound and music are listened to and the impact level thereof is determined. In the case of a scent, the scent is sniffed and its impact level is determined. In the case of taste, try eating something and determine its impact level. In the case of tactile sensation, something is touched and the impact level is determined. In the case of sight, the degree of attention of the visual recognition target is determined. The type of scent, taste and touch is not limited.

Finally, the brain activity level R of the subject (viewer) 1 is output (displayed) based on the results of the determination/diagnosis as described above (step ST7). This makes it possible to objectively display the stimulus magnitude, such as how much stimulus the brain of the subject (viewer) 1 receives, by digitizing the data or displaying it in a contrasting format such as graphs and tables at a glance. Can be expressed as

As described above, according to the brain activity level determination device, the brain activity level determination system, and the program of the embodiment of the present invention, the brain activity level of the subject 1 and the impact level of stimulation, that is, how much stimulation the brain has. It is possible to objectively express the magnitude of the stimulus that indicates whether or not the subject is receiving it, by displaying it in numerical data or in a contrasting format such as a graph or table, so that the brain activity level of the subject can be recognized at a glance. It becomes possible to do.

A normal computer can be used as a hardware configuration of the brain activity amount determination device 100 according to the embodiment of the present invention. The brain activity amount determination device 100 is configured by a computer including a CPU, a volatile storage medium such as a RAM, a non-volatile storage medium such as a ROM, and an interface. Each function of the receiving unit 101, the analyzing unit 102, the storing unit 103, the diagnosing unit 104, and the displaying unit 105 included in the brain activity amount determination device 100 is realized by causing a CPU to execute a program describing these functions. To be done. Further, these programs can be stored and distributed in a storage medium such as a magnetic disk (floppy (registered trademark) disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), semiconductor memory, etc., and distributed via a network. You can also send and receive.

It should be noted that the invention of the present application can modify any of the components of the embodiment or omit any of the components of the embodiment within the scope of the invention.

1 subject (viewer)
2 Targets (visual target, stimulus target)
3 Luminance Measuring Device 4 Eyeball Imaging Device 5 Visual Scene Imaging Device 6 Headphones 7 Transmission Device 8 Storage Device 100 Brain Activity Level Determination Device 101 Reception Unit 102 Analysis Unit 103 Storage Unit 104 Diagnostic Unit (Calculation Unit)
105 display unit (output unit)

Claims (6)

Based on the pupil diameter of the subject whose brain is active with respect to the object, a brain activity amount determination device for determining the activity level of the brain of the subject,
A receiver for receiving a pupil diameter A of the subject in normal times, a pupil diameter B of the subject's brain when the subject is most active, and a pupil diameter C of when the subject performs a specific stimulation activity;
Based on the normal pupil diameter A of the subject received by the receiving unit, the pupil diameter B when the subject's brain is most active, and the pupil diameter C when the subject performs a specific stimulation activity. A calculation unit that calculates a numerical value of the brain activity level when the subject performs a specific stimulation activity,
A device for determining brain activity, comprising: The brain activity determination device according to claim 1,
The calculation unit,
The difference between the pupil diameter B when the subject's brain is most active and the normal pupil diameter A of the subject is calculated as the maximum activity width S1 of the subject,
The difference between the pupil diameter C when the subject performs a specific stimulation activity and the pupil diameter A of the subject in normal times is calculated as the stimulation width L1 of the subject,
A brain activity amount determination device, which calculates a numerical value of a brain activity level when the subject performs a specific stimulation activity, based on the maximum activity width S1 of the subject and the stimulation width L1 of the subject. The brain activity determination device according to claim 1,
The calculation unit,
Further, the difference between the pupil diameter B when the brain of the subject is most active and the pupil diameter A of the normal time is the pupil when the average human brain is most active, calculated from the pupil diameters of a plurality of subjects. A brain activity amount determination device, characterized in that the specific stimulation activity is determined to be in a stress state when the difference is smaller than the difference between the diameter and the average pupil diameter of an average human brain. The brain activity determination device according to claim 1,
Furthermore, it has a storage unit,
The receiving unit,
In addition to the subject's normal pupil diameter A, the pupil diameter B when the subject's brain is most active, and the pupil diameter C when the subject performs a specific stimulation activity, the subject is the darkest subject. Receiving a pupil diameter P1 when seeing an object and a pupil diameter P2 when the subject sees the brightest object,
The storage unit is
An average human normal pupil diameter calculated from the pupil diameters of a plurality of subjects within a predetermined range based on the age of the subject, the average human pupil diameter when the brain is most active, The pupil diameter when the average human sees the darkest target object, and the pupil diameter when the average human sees the brightest target object is accumulated,
The calculation unit,
The difference between the pupil diameter B when the brain of the subject is most active and the pupil diameter A of the subject during normal operation is calculated as the maximum activity width S1 of the subject, and when the subject looks at the darkest object. The difference between the pupil diameter P1 and the pupil diameter P2 when the subject looks at the brightest object is calculated as the maximum change amount P of the subject, and the maximum activity width S1 of the subject is the maximum change amount P of the subject. The result of the division is calculated as the adjusted maximum activity width S of the subject,
The difference between the pupil diameter when the average human brain is most active and the average human pupil diameter during normal operation is calculated as the maximum activity width of the average human, and the average human is the most The difference between the pupil diameter when the dark object is viewed and the pupil diameter when the average human looks at the brightest object is calculated as the maximum change amount of the average human, and the average The result obtained by dividing the maximum activity range of the human by the maximum change amount of the average human is calculated as the adjusted maximum activity range of the average human,
A result obtained by dividing the adjustment maximum activity width S of the subject by the average adjustment maximum activity width of the human is calculated as a numerical value of the degree of cognition of the subject or a numerical value of the degree of depression of the subject. Brain activity amount determination device. The brain activity determination device according to claim 1,
The brain activity amount determination device determines the brain activity level of the subject's sight, hearing, smell, taste or touch. A program for determining the activity level of the brain of the subject based on the pupil diameter of the subject in which the brain is active with respect to the object,
On the computer,
Receiving a normal pupil diameter A of the subject, a pupil diameter B of the subject when the brain is most active, and a pupil diameter C of when the subject performs a specific stimulation activity.
Based on the received normal pupil diameter A of the subject, the pupil diameter B when the subject's brain is most active, and the pupil diameter C when the subject performs a specific stimulation activity, A step of calculating a numerical value of the activity level of the brain when a specific stimulation activity is performed,
A program to execute.

Images