JP2008125802A - Biofeedback device - Google Patents

Abstract

A biofeedback device that performs state induction efficiently and with high accuracy is provided.
A biofeedback device includes a physiological measurement unit that acquires physiological information of a guidance target person, and an autonomic nerve activity index that indicates the state of autonomic nerve activity based on the physiological information acquired by the physiological measurement unit. Autonomic nerve activity index calculating unit 40 that calculates the autonomic nerve activity index of the person to be guided, the stimulus presentation unit 80 that presents the stimulus to the person to be guided, and the past stored in the memory unit 100 A control unit 60 that calculates a stimulus amount and a stimulus intensity to be presented based on a temporal change in the autonomic nerve activity index of the subject and causes the stimulus presentation unit 80 to present the stimulus.
[Selection] Figure 1

Description

  The present invention relates to a biofeedback device that estimates the state of an autonomic nerve from physiological information and guides it to an appropriate physiological state.

  In recent years, biofeedback devices that control a human physiological state by applying stimuli such as music or light are known. By using such a biofeedback device, a user who has been stimulated is induced to feel uplifted or relaxed.

  As an example of a biofeedback device, a physiological state induction device that performs state induction using physiological information has been proposed (Patent Document 1). Patent Document 1 considers biological information such as a real-time heart rate, pulse rate, and respiration rate of a person to be guided, and gives a stimulus that reveals a physiological state that is the same as the physiological state of the person to be guided. Discloses a physiological state inducing device that relaxes the physiological state of the patient and gradually induces the physiological state to the target physiological state. With this configuration, Patent Document 1 states that the physiological state of the person to be guided can be effectively and easily guided to a desired state.

As another example of a biofeedback device, a sensitivity activation system has been proposed (Patent Document 2). The sensitivity activation system of Patent Document 2 monitors the state of the user, detects the state change of the user according to the sensory stimulus presented by the stimulus presentation means, and based on the history of the state change of the user, Control the stimulus presented to the user. With this configuration, Patent Document 2 states that the user's sensibility activation can be performed efficiently.
JP 2004-222818 A JP 2002-334339 A

  In general, the biofeedback device induces a physiological state by giving a stimulus to a guidance target person and changing the state of the autonomic nerve. Here, the autonomic nervous system is a system that optimizes the internal environment of a living body, and includes a sympathetic nerve and a parasympathetic nerve. The sympathetic and parasympathetic nerves interact to automatically adjust functions such as internal organs, blood vessels, and glands regardless of the intention of the living body.

  However, since changes in the state of the autonomic nervous system vary among individuals depending on individual attributes, characteristics, etc., even if the same stimulus is presented, there may be a difference in the effect of state induction. For this reason, the physiological state inducing device of Patent Document 1 has a problem that the physiological state of the person to be guided cannot be guided to a desired state because individual differences are not considered.

  Moreover, the sensitivity activation system of patent document 2 presents a stimulus based on the history of the state change of the user. However, the information included in the history is information indicating the presence or absence of the user's reaction to various sensory stimuli, and no state induction has been proposed in consideration of the characteristics of changes in autonomic nerves.

  Therefore, an object of the present invention is to solve the above-described problems, and is to provide a biofeedback device that performs state induction efficiently and with high accuracy.

The object of the present invention is achieved by a biofeedback apparatus having the following configuration. A biofeedback device for inducing a physiological state by presenting a stimulus to a target person, a physiological measurement unit that acquires physiological information of the target person, and an autonomic nerve based on the physiological information acquired by the physiological measurement unit An autonomic nerve activity index calculating unit that calculates an autonomic nerve activity index indicating the state of the activity of the subject, a memory unit that stores the autonomic nerve activity index of the person to be guided, a stimulus presenting unit that presents a stimulus to the person to be guided, and a memory A control unit that calculates a stimulus amount and a stimulus intensity to be presented based on a temporal change in a past autonomic nerve activity index stored in the unit and causes the stimulus presentation unit to present the stimulus.

  With this configuration, since the stimulus amount and the stimulus intensity to be presented are determined based on the past change characteristics of the autonomic nerve, the physiological state of the guidance target person can be guided efficiently and with high accuracy. Further, since history information is used, state guidance according to the guidance target person is possible.

  Preferably, the biofeedback device further includes a target value setting unit that sets a target value of the autonomic nerve activity index, and a driving environment information acquisition unit that acquires driving environment information, and the control unit is stored in the storage unit. The amount of stimulation according to the difference between the temporal change of the past autonomic nerve activity index and the target value in the driving environment is calculated.

  With this configuration, it is determined whether the activity of the autonomic nerve of the target person is likely to decrease and the amount of stimulation to be presented is controlled, so that the optimal target can be presented to the target person and efficient and highly accurate State induction is possible.

  More preferably, the storage unit further stores a temporal change of the reference autonomic nervous activity index, and the control unit compares the temporal change of the past autonomic nervous activity index with the reference, and the past autonomic nervous activity If the temporal change of the index is larger than the reference, the amount of stimulation corresponding to the difference between the reference and the target value is calculated.If the temporal change of the past autonomic nervous activity index is smaller than the reference, The amount of stimulation corresponding to the difference between the temporal change of the autonomic nervous activity index and the target value is calculated.

  With this configuration, an amount of stimulation corresponding to the difference from the target value is presented to the guidance target person whose autonomic nerve activity is likely to be lower than the reference. On the other hand, when the autonomic nerve activity is less likely to be lower than the reference, an equal amount of stimulation is presented. Therefore, when the activity of the autonomic nerve is likely to be lower than the reference, the amount of stimulation to be presented is newly calculated, so the processing burden can be reduced and the time required for determining the amount of stimulation can be shortened.

  Preferably, the biofeedback device further includes a target value setting unit that sets a target value of the autonomic nerve activity index, and a driving environment information acquisition unit that acquires driving environment information, and the storage unit is a guide after the stimulus presentation The subject's autonomic nerve activity index is further stored, and the control unit obtains the time-dependent change in the autonomic nerve activity index after the past stimulus presentation stored in the memory unit and the target value in the acquired driving environment. In comparison, the stimulation intensity to be presented is calculated.

  With this configuration, since the stimulus intensity to be presented is controlled based on the effect on the stimulus of the guidance target person, it is possible to present an optimal stimulus to the guidance target person and efficiently and highly accurately induce the state.

  Preferably, the travel environment information acquisition unit acquires travel environment information including at least one of weather, time, road type, traffic jam situation, vehicle interior temperature, vehicle interior illumination, and travel speed.

  Preferably, the target setting unit sets an autonomic nerve activity index when the subject person is calm as a target value.

  With this configuration, the person to be guided can be guided to a stable physiological state. In addition, it is possible to present a stimulus having an amount and intensity corresponding to individual differences.

  As described above, the present invention can provide a biofeedback device that performs state induction efficiently and with high accuracy.

(Embodiment 1)
A biofeedback device according to the present embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the biofeedback device 1. The biofeedback device of the present embodiment has a function of measuring physiological information to determine the state of the driver's autonomic nerve and guiding the physiological state to an optimal state for driving a car. The biofeedback device according to the present embodiment is mounted on, for example, an automobile. Details of each configuration of the biofeedback device will be described below.

  As shown in FIG. 1, the biofeedback device 1 includes a state target setting unit 10, a traveling environment measurement unit 20, a physiological measurement unit 30, a state estimation unit 40, a state determination unit 50, and a control determination unit 60. , A notification unit 70, a stimulus presentation unit 80, an operation unit 90, and a storage unit 100.

  The physiological measurement unit 30 is a variety of sensors that measure physiological information such as a driver's heart rate, blood pressure, respiratory rate, skin electrical reflection (GSR), and facial color. For example, an electrocardiographic sensor or a pulse wave sensor is used. The physiological measurement unit 30 may be embedded in, for example, a steering wheel in contact with both hands of the driver. The physiological information measured by the physiological measurement unit 30 is output to the state estimation unit 40.

  The traveling environment measurement unit 20 acquires information related to the traveling environment of the automobile in which the biofeedback device is installed. The traveling environment measurement unit 20 measures, for example, weather, time, road type (highway, general road, mountain road), traffic jam situation, and the like. The traveling environment measurement unit 20 may acquire the above information via a navigation device installed in the automobile. The measurement result is output to the state estimation unit 40 and the state target setting unit 10.

The state estimation unit 40 estimates the state of the driver's autonomic nerve based on the physiological information output from the physiological measurement unit 30. Specifically, the state estimation unit 40 analyzes the fluctuation of the heart rate RR interval that is the interval between the heart rate peaks from the heart rate measured by the physiological measurement unit 30, and calculates the sympathetic nerve activity amount and the parasympathetic nerve activity amount. . That is, when the fluctuation of the heart rate RR interval is subjected to spectrum conversion, two components having peaks in the high frequency component HF and the low frequency component LF appear. Based on the result of the spectrum analysis, the state estimation unit 40 calculates a sympathetic nerve activity amount (LF), a parasympathetic nerve activity amount (LF / HF), and an autonomic nerve level, which are indices indicating the state of autonomic nerve activity. Here, the autonomic nerve level is expressed by the following equation.
(LF / HF) / (LF _B / HF _B ) (Formula 1)
However, LF _B and HF _B are a high frequency component and a low frequency component of fluctuation of the heart rate RR interval at rest.
The calculated autonomic nerve level, sympathetic nerve activity amount, and parasympathetic nerve activity amount are output to the state determination unit 50 and the storage unit 100. Although the amount of autonomic nerve activity is calculated using fluctuations in the heart rate RR interval, it may be calculated from blood pressure, respiratory rate, skin electrical reflex, and the like.

  The operation unit 90 is a member for the driver to input various information such as the state of the autonomic nerve, the body weight, and sex. Here, the state of the self-autonomous nerve is information indicating the presence or absence of sleepiness and the level of tension, for example. The operation unit 90 may be an input panel of a navigation device, or may be a keyboard or a pointing device.

  The storage unit 100 is, for example, an internal memory or a detachable removable memory that stores past and present autonomic nerve levels in association with a traveling environment. In addition, the memory | storage part 100 memorize | stores the time change of the autonomic nerve level when a stimulus is not shown, and the time change of the autonomic nerve level after a stimulus is shown for every driver. Thereby, even if the driver is different even in the same automobile, state induction is possible.

  The state determination unit 50 determines the state of the driver's autonomic nerve based on the autonomic nerve level and the amount of autonomic nerve activity calculated by the state estimation unit 40 and the basic information of the driver stored in the storage unit 100. That is, the state determination unit 50 compares the calculated amount of autonomic nerve activity with the amount of autonomic nerve activity during calm, and determines whether the sympathetic nerve activity amount and the parasympathetic nerve activity amount are increased or decreased, respectively. To do. Furthermore, the state determination unit 50 determines whether the physiological state of the driver is in a tension state, a state in which drowsiness is occurring, or the like according to the determination result. Information regarding the determination result and the determined physiological state of the driver is output to the control determination unit 60.

  The state target setting unit 10 sets the autonomic nerve level to be guided as a target value. The target value may be, for example, an autonomic nerve level at rest, or an average value of past autonomic nerve levels. The set target value is output to the control determination unit 60.

  The control determination unit 60 controls a notification unit 70 and a stimulus presentation unit 80, which will be described later, to bring the driver's autonomic nerve level closer to the target value and induce the driver's physiological state. In particular, in the present embodiment, the control determination unit 60 determines the stimulus amount and the stimulus intensity to be presented using the past autonomic nerve level change characteristics stored in the storage unit 100.

  The notification unit 70 notifies the driver about the current state of the autonomic nerve and makes an inquiry. The notification unit 70 may be, for example, a display device or an audio output device independent of the display panel of the navigation device or the navigation device.

  The stimulus presentation unit 80 outputs a stimulus to guide the driver's autonomic level to a target value. As the stimulus, for example, a scent, light, sound, or the like is used, and a light bulb is turned on, blinked, extinguished, a scent is sprayed, or a sound with a predetermined tempo is sounded. The type of stimulation is not limited to this as long as it stimulates the human senses. For example, the stimulus presentation unit 80 elevates the driver by spraying high incense to stimulate the driver's sense of smell. On the other hand, if you want to relax the driver, spray with sedative scent.

  In addition, when presenting light as a stimulus, the stimulus presentation unit 80 relaxes the driver by blinking light having a short wavelength at intervals longer than the standard. For example, the stimulus presentation unit 80 blinks blue light at 30-second intervals. On the other hand, in order to elevate the driver, light having a long wavelength may be blinked at intervals shorter than the standard. For example, red light is blinked at intervals of 1 second. In such a case, the backlight of the front panel of the automobile and the stimulus presentation unit 80 may be used in combination.

  In addition, when presenting sound as a stimulus, the stimulus presentation unit 80 causes the driver to listen to a song with a slower tempo than the standard and relax. On the other hand, in order to elevate the driver, the stimulus presentation unit 80 allows the driver to listen to a song whose tempo is higher than the standard. Alternatively, a warning sound may be sounded to elevate.

Note that the types of stimulation and the presentation method described above are examples, and are not limited thereto. For example, the steering wheel or seat of an automobile may be vibrated to be lifted or relaxed, or a plurality of stimuli such as scent, light, and sound may be combined. Furthermore, when the autonomic nerve activity level and the target value greatly deviate from the viewpoint of immediate effect, effect, and sustainability, the stimulus presentation unit 80 presents the stimulus in the order of fragrance, light, and sound, and the divergence is small. In some cases, stimuli may be presented in the order of light and sound.

  A stimulus presentation process in the biofeedback apparatus configured as described above will be described with reference to the flowchart of FIG. First, in step S101, the operation unit 90 is operated by a driver, and a destination is set. A navigation device (not shown) searches for a route from the current location to the destination, and the driving route is determined by the driver.

  Subsequently, in step S102, the travel environment measurement unit 20 acquires travel environment information including the weather, time, road type (highway, general road, mountain road), traffic condition, and the like on the determined travel route via the navigation device. To do.

  Next, in step S <b> 103, the control determination unit 60 acquires the same traveling environment among the temporal changes in the past autonomic nerve level stored in the storage unit 100. For example, when the determined road type of the travel route is an expressway, the control determination unit 60 acquires from the storage unit 100 a temporal change in the autonomic nerve level when the vehicle travels on the expressway in the past.

  Subsequently, in step S104, the control determination unit 60 determines whether or not the autonomic nerve level of the driver that is the target of state guidance is more sedated than the standard based on the temporal change in the autonomic nerve level acquired from the storage unit 100. Determine. FIG. 3 is a diagram showing the relationship between changes in the autonomic nerve level and time. FIG. 3 shows an example of a change in the autonomic nerve level when the driver A has traveled on the highway in the past, and a change in the autonomic nerve level of a standard driver as “standard”. The “target value” is an autonomic nerve level appropriate for driving set by the state target setting unit 10. The control determination unit 60 compares the change in the past autonomic nerve level of the driver to be guided with the change in the “standard” autonomic nerve level, and determines whether or not the autonomic nerve level is easily sedated. As shown in FIG. 3, it can be seen that the autonomic nerve level of driver A decreases with time and is more sedated than the standard. Therefore, in the example illustrated in FIG. 3, the control determination unit 60 determines that “sedation is easier than standard” (that is, “Yes”), and the process proceeds to step S <b> 105. On the other hand, if the change in the past autonomic nerve level is equal to or higher than the “standard” autonomic nerve level, the control determination unit 60 determines “No” and shifts the processing to step S106.

  Subsequently, in step S105 and step S106, the stimulus amount to be presented is determined based on the determination result in step S104. That is, the control determination unit 60 calculates the difference between the target value and the calculated autonomic nerve level, and determines the stimulus amount to be presented. When it is determined that the autonomic nerve level is likely to be sedated, the stimulation amount is set according to the difference d2 from the target value (step S105). On the other hand, if the change in the past autonomic nerve level is “standard” or more, the stimulation amount corresponding to the difference d1 between the standard and the target value is set (step S106).

  In step S104, when the change in the past autonomic nerve level is larger than the change in the standard autonomic nerve level, all the stimulation amounts are set according to the difference d1, but the change in the past autonomic nerve level and the target value are set. The amount of stimulation according to the difference between and may be set.

  As described above, the control determination unit 60 determines whether or not the driver's autonomic nerve activity is likely to decrease from the past autonomic nerve level change characteristics stored in the storage unit 100 by the processing of steps S103 to S106. Then, the amount of stimulation to be presented is determined.

Next, in step S <b> 107, the control determination unit 60 acquires a temporal change in the past autonomic nerve level stored in the recording unit 100 and after the stimulus presentation. That is, the control determination unit 60 acquires information on the stimulation effect of the driver that is the guidance target. FIG. 4 is a diagram showing the relationship between the elapsed time from the stimulus presentation and the change in the autonomic nerve level. FIG. 4 shows temporal changes in the autonomic nerve levels of three drivers A, B, and C as an example. When the acquired autonomic nerve level does not reach the target value even after the time t1 has elapsed, the control determination unit 60 determines that the driver has a low effect on stimulation (that is, determines “Yes”). ), The process proceeds to step S109. For example, in FIG. 4, since the three drivers A, B, and C have not reached the target value by time t1 and are considered to have a low effect on stimulation, the control determination unit 60 determines “Yes” in step S108. . On the other hand, when the target value has been reached before the time t1 has elapsed, the control determination unit 60 determines “No” and proceeds to step S110.

  In step S108, it is determined that the effect on the stimulus is low unless the target value is reached by the time t1, but the present invention is not limited to this. For example, if the autonomic nerve level does not reach the range of ± 20% of the target value by the elapsed time t1, it may be determined that the effect on the stimulus is low.

  When it determines with "Yes" in step S108, the control determination part 60 sets the irritation | stimulation intensity | strength which should be shown to large (step S109). On the other hand, when it determines with "No" in step S108, the control determination part 60 sets the stimulus intensity | strength which should be shown to a standard (step S110). As described above, the control determination unit 60 determines whether or not the effect on the driver's stimulus is low based on the change characteristic of the autonomic nerve level with respect to the past stimulus stored in the storage unit 100 by the processing of steps S107 to S110. To determine the stimulus intensity to be presented.

  Note that the stimulus may be presented with the set stimulus intensity from the start to the end of the presentation of the stimulus, or the stimulus may be presented with a pattern according to the set stimulus intensity. For example, as shown in FIG. 5, when the stimulus intensity is set to be large, the stimulus intensity from immediately after the start of presentation to a certain period is made larger than the standard, and the stimulus intensity after the lapse of a certain time is equal to the standard. Stimulus may be presented as follows.

  Next, in step S <b> 111, the stimulus presentation unit 80 presents a stimulus to the driver according to the stimulus amount and stimulus intensity set by the control determination unit 60. Thereby, the autonomic nerve level can be brought close to the target value and the driver can be guided to a desired physiological state. Thus, the stimulus presentation process ends.

  In addition, when the stimulus presentation unit 80 starts presenting the stimulus, the storage unit 100 stores the autonomic nerve level in association with the traveling environment at every predetermined time. Therefore, the autonomic nerve level newly stored in this process is used as past history information in the next process in which the destination is newly set and the stimulation amount and the stimulation intensity are determined.

  As described above, the biofeedback device according to the present embodiment determines whether or not the activity of the autonomic nerve is likely to decrease based on the characteristic of change in the past autonomic nerve level of the driver to be guided, and presents it. Determine the amount of stimulation to be done. Thereby, the stimulus according to the driver can be presented.

In addition, the biofeedback device according to the present embodiment determines and presents the effect on the driver's stimulus based on the change characteristic of the past autonomic nerve level of the driver to be guided and after the stimulus is presented. Determine the intensity of the stimulus to be applied. Thereby, the stimulus according to the driver can be presented. As described above, the biofeedback device according to the present embodiment can determine the stimulus amount and the stimulus intensity in advance before presenting the stimulus, so that the state induction can be performed efficiently and with high accuracy. Moreover, since the stimulus amount and the stimulus intensity are determined using the history information, the time until the control method is determined can be greatly shortened.

  Further, the biofeedback device according to the present embodiment controls the stimulation amount and the stimulation intensity to be presented by using the past change characteristics of the autonomic nerve level in the same driving environment, so that it corresponds to the driving environment. State guidance is possible, and the accuracy can be further improved. In the present embodiment, only the case where the road type is a highway in the driving environment has been described, but the change characteristics of the past autonomic nerve level in the driving environment such as the driving speed, weather, time, etc., or a combination thereof are described. Even if it is used, the same effect can be obtained.

  Moreover, the traveling environment in this Embodiment is not restricted to what was shown above. For example, the traveling environment measurement unit 20 may acquire information such as the temperature and illuminance in the passenger compartment, the distance to the signal, the distance to the vehicle ahead, the number of vehicles overtaken or overtaken as the traveling environment information. Thereby, since the state induction is possible in consideration of the degree of tension in each traveling environment, the accuracy can be further improved.

  In the present embodiment, when the scent is used as the stimulus, the stimulus intensity is controlled by changing the scent concentration and the cycle of spraying the scent. Moreover, what is necessary is just to change chromaticity, a luminance rate, etc., when using light as a stimulus. Furthermore, when using sound as a stimulus, the frequency, volume, etc. may be changed. On the other hand, the stimulation amount may be changed by changing the spraying amount when using a scent, and the light amount or the like may be changed when using light.

  In the present embodiment, the autonomic nerve level is calculated using Equation 1, but it is not limited to this as long as it is an index indicating the activity of the autonomic nerve.

  In the present embodiment, the temporal change in the autonomic nerve level is stored in the storage unit, but only the autonomic nerve level may be stored, and the state estimation unit may calculate the temporal change in the autonomic nerve level. . Moreover, each structure of the biofeedback apparatus in this Embodiment is an example, and if it is a range which does not impair the characteristic function of this invention, it will not be restricted to these structures.

  The present invention is suitable for automobiles, railway vehicles, ships, airplanes, and the like that require a device capable of more accurately grasping physiological states and inducing state guidance. The present invention can be applied not only to devices that support driving, but also to medical devices, physical condition management devices, and the like.

The block diagram which shows the structure of the biofeedback apparatus which concerns on this Embodiment The flowchart which shows the stimulus presentation process in this Embodiment The figure which shows the relationship between the change of the autonomic nerve level and time in this Embodiment The figure which shows the relationship between the elapsed time from the stimulus presentation in this Embodiment, and the change of an autonomic nerve level The figure which shows an example of the stimulus presentation pattern in this Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Biofeedback apparatus 10 State target setting part 20 Running environment measurement part 30 Physiological measurement part 40 State estimation part 50 State determination part 60 Control determination part 70 Notification part 80 Stimulus presentation part 90 Operation part 100 Storage part

Claims (6)

A biofeedback device for inducing a physiological state by presenting a stimulus to a target person,
A physiological measurement unit that acquires physiological information of the person to be guided;
An autonomic nerve activity index calculating unit that calculates an autonomic nerve activity index indicating the state of autonomic nerve activity based on the physiological information acquired by the physiological measuring unit;
A storage unit for storing the autonomic nervous activity index of the person to be guided;
A stimulus presentation unit for presenting the stimulus to the guidance target person;
A control unit that calculates a stimulus amount and a stimulus intensity to be presented based on a temporal change in a past autonomic nerve activity index stored in the storage unit, and causes the stimulus presentation unit to present a stimulus; Feedback device. The biofeedback device further includes:
A target value setting unit for setting a target value of an autonomic nervous activity index;
A driving environment information acquisition unit for acquiring driving environment information;
The biofeedback according to claim 1, wherein the control unit calculates a stimulus amount according to a difference between a temporal change in a past autonomic nerve activity index stored in the storage unit and the target value in the traveling environment. apparatus. The storage unit further stores temporal changes in a reference autonomic nerve activity index,
The control unit compares a temporal change of the past autonomic nervous activity index with the reference, and if the temporal change of the past autonomic nervous activity index is larger than the reference, the reference and the target value Calculate the amount of stimulation according to the difference between
The amount of stimulation according to a difference between the temporal change of the past autonomic nervous activity index and the target value is calculated when the temporal change of the past autonomic nervous activity index is smaller than the reference. 2. The biofeedback device according to 2. The biofeedback device further includes:
A target value setting unit for setting a target value of an autonomic nervous activity index;
A driving environment information acquisition unit for acquiring driving environment information;
The storage unit further stores an autonomic nervous activity index of the person to be guided after the stimulus presentation,
The control unit is a temporal change of an autonomic nerve activity index after presenting a past stimulus stored in the storage unit, and compares the acquired value in the traveling environment with the target value, and the stimulus to be presented The biofeedback device according to claim 1, wherein the strength is calculated.   The said driving environment information acquisition part acquires the driving environment information containing at least 1 among a weather, time, road classification, traffic jam condition, vehicle interior temperature, vehicle interior illumination intensity, and driving speed. Biofeedback device.   The biofeedback device according to claim 1, wherein the target value setting unit sets an autonomic nerve activity index when the subject person is calm as a target value.

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