JP3194187B2 - Fmθ guidance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for stimulating human hearing and inducing a specific electroencephalogram.
More specifically, the present invention relates to a device for inducing Fmθ by stimulating human hearing with a modulated wave.

[0002]

2. Description of the Related Art The potential difference observed between two different points on the cerebral cortex and scalp is called "brain wave" and has a unique waveform and rhythm corresponding to the state of mind and body. Brain waves are generally classified into four waves, an α wave, a β wave, a θ wave, and a δ wave, depending on the period of the rhythm. Among them, α waves having a period of 8 to 13 Hz are strong and appear continuously over a wide area as the body and mind relax. On the other hand, β waves having a period of 18 to 30 Hertz, on the contrary, become stronger and appear more widely as the body and the body become nervous. The θ wave having a period of 4 to 8 Hz and the δ wave having a period of less than 4 Hz are brain waves related to sleep onset. It is said that the θ wave appears strongly when falling asleep, and the δ wave becomes dominant as the sleep becomes deeper. Inoue and others
EG of Mental Activities ”,
As seen on pages 136-148 (1988),
Among the θ waves, it is observed near the median frontal region of adults 6
The predominant θ rhythm of ~ 7 Hz is called “Fmθ” and is said to be deeply involved in mental work. Analyzing the brain waves of a person performing mental work, it was observed that Fmθ appeared near the median frontal region of the worker, and the intensity and distribution increased as the worker's attention and concentration increased. , Strong and widespread.

[0003] As described above, since Fmθ has a close relationship with attention and concentration, if Fmθ can be artificially induced by any method, the attention and concentration of the worker can be improved. It is expected that work efficiency and accuracy can be improved. However, no device or method capable of artificially inducing Fmθ has been known so far.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide an apparatus for guiding Fmθ artificially.

[0005]

Means for Solving the Problems The present inventor has conducted intensive studies on means capable of achieving the above object. As a result, modulation obtained by superposing an ultra-low frequency having a frequency of about 20 Hz or less on a low frequency in an audible range is considered. When waves stimulate humans through hearing,
It was found that Fmθ was stronger and appeared in a wide range.
The present invention is based on such a novel finding, and provides a modulated wave generating circuit in which an extremely low frequency having a frequency of about 20 Hz or less is superimposed on a low frequency in an audible range, and an output terminal of the modulated wave generating circuit. The gist of the present invention is a structure of an Fmθ guiding device that includes an electroacoustic transducer that is connected and converts the modulated wave into audible stimulus.

[0006]

According to the present invention, a modulated wave obtained by superimposing an extremely low frequency having a frequency of about 20 Hz or less on a low frequency in an audible range generated by a modulated wave generating circuit is converted into an audible stimulus by an electroacoustic transducer. Is converted. When a modulated wave according to the present invention stimulates a human through hearing, Fmθ in the brain wave
Urges the emergence of. In particular, if the very low frequency is about 2 to 10
When in the Hertz range, not only Fmθ but also the appearance of α waves is urged.

Hereinafter, the present invention will be described in detail with reference to examples and experimental examples. The modulated wave referred to in the present invention is a super-low frequency of about 20 Hz or less superimposed on a low frequency in an audible range. It becomes. Such low frequencies are usually
A continuous wave or pulse wave of an appropriate waveform having a frequency exceeding the very low frequency and not exceeding about 20,000 Hertz is used.
The present inventor has conducted various tests on healthy subjects. As a result, when the frequency of the low frequency exceeds about 6,000 Hz, some subjects may complain of difficulty in hearing or slight discomfort. In practice, considering the very low frequency and the frequency characteristics of the electroacoustic transducer, it is usually about 50 to 3,000.
It is preferable to set the frequency to 0 Hz, preferably about 100 to 500 Hz, and more preferably about 120 to 200 Hz. Various tests were performed on the waveforms in the same manner.
A continuous wave such as a sine wave, or a pulse wave such as a saw-tooth wave, a square wave, a triangular wave, or a rectangular wave, for example, having a relatively long pulse duration was preferable. On the other hand, for the very low frequency, a continuous wave or a pulse wave having a frequency of about 20 Hz or less, usually about 2 to 10 Hz is desirable, and the waveform is a continuous wave such as a sine wave as in the case of the low frequency. And
Pulse waves of relatively long duration are preferred.

As described above, the modulated wave generating circuit according to the present invention is an electric circuit for generating a modulated wave in which a specific low frequency is superimposed on a specific low frequency, and generally generates a low frequency. A first oscillation circuit, a second oscillation circuit that generates an ultra-low frequency, and an input terminal connected to the output terminal of the oscillation circuit, and modulates the low frequency at an ultra-low frequency, for example, amplitude A modulation circuit such as a modulation circuit, a phase modulation circuit, a frequency modulation circuit, or a pulse modulation circuit. The circuit configuration and circuit elements in the oscillation circuit and the modulation circuit are not particularly limited as long as the modulated wave appearing at the output end of the modulation circuit satisfies the above requirements, but generally, a transistor, a field effect transistor, and / or It is composed mainly of integrated circuits. The output of the modulation circuit itself is low,
If the modulating circuit alone cannot substantially activate the electroacoustic transducer due to reasons such as impedance mismatch between the output terminal of the modulating circuit and the electroacoustic transducer, the modulating circuit and the electroacoustic transducer It does not prevent the insertion of an appropriate amplifier, matching circuit, or the like between them. Such an embodiment is naturally included in the present invention.

As another mode of the modulated wave generating circuit, the modulated wave generating circuit is constituted by a reproducing circuit and, if necessary, an amplifying circuit, and the reproducing circuit records the information on a magnetic or optical recording medium. The modulated wave may be reproduced, and the reproduced output may be amplified as necessary, and then supplied to the electroacoustic transducer. Examples of the magnetic recording medium include a magnetic tape, a magnetic disk, and a magnetic floppy, and examples of the optical recording medium include an optical disk.
More specifically, for example, the modulated wave is recorded on a general audio tape, a compact disk, or the like, and the reproduced wave is reproduced by a general reproducing apparatus to be heard by a subject. According to such an aspect, the home audio / video device can be used as it is,
It is very convenient.

The inventors of the present invention have conducted various tests on the degree of modulation of the modulated wave in healthy subjects, focusing on the inducing ability and side effects of Fmθ. When in the range of about 70 to 90%, the highest level of Fmθ could be induced without substantially causing side effects such as discomfort. Therefore, it is desirable to set the output of the oscillation circuit or the like so that the modulation degree of the low frequency by the extremely low frequency falls within this range, or to adjust the modulation circuit so as to fall within this range. Since the modulation degree of the low frequency due to the very low frequency and the optimum frequency of the low frequency and the very low frequency are usually slightly different depending on the individual subjects, each subject has the optimal modulation degree and the optimum frequency. It is desirable to provide the oscillation circuit and / or the modulation circuit with a function of adjusting the degree of modulation and the frequency within a certain range so as to receive audible stimulation.

The audible stimulus according to the present invention is a so-called "1".
/ F fluctuation "significantly increases the Fmθ inducing ability. That is, when the appearance frequency, duration, frequency, and / or intensity of the audible stimulus is changed according to the 1 / f fluctuation rule, the audible stimulus based on the modulated wave and the fluctuation due to the 1 / f fluctuation rule act synergistically. It has been found that the appearance of Fmθ is promoted to such an extent that it cannot be easily achieved by only one of them. In particular, a sequence having 1 / f fluctuation sampled from long-term fluctuations of biological phenomena including brain waves, heart rate, blood pressure, respiration, and body temperature is extremely useful, and based on such a sequence, the appearance frequency of an audible stimulus, When varying the duration, frequency and / or intensity, a very high level of Fmθ can be induced with a small amount of stimulation, which persists for a long time after stimulation. This is because a series with 1 / f fluctuation sampled from long-term fluctuations in human biological phenomena contains a lot of important information on biological control mechanisms represented by the nervous system. It is understood that the perception of Fm [theta] in addition to the effect of promoting the appearance of Fm [theta] leads to a synergistic increase in the physiological action of the audible stimulus according to the present invention. In order to impart such a variation to the audible stimulus, for example, the above-described sequence is stored in a microprocessor, and an electric signal containing a pseudo 1 / f fluctuation sequence extracted therefrom is turned on / off via an interface. To the circuit and turn it on /
What is necessary is just to control the conduction of the oscillation circuit and the modulation circuit by the off circuit.

The modulated wave obtained as described above is supplied to an electroacoustic transducer, where it is converted into an audible stimulus. The audible stimulus in the present invention means a stimulus that can be perceived by a human auditory organ, and usually means a sound wave. Therefore, the electroacoustic transducer referred to in the present invention is:
This is a means for converting the modulated wave generated electrically as described above into a sound wave. Examples of the individual electroacoustic transducers include, for example, electrodynamic speakers, electromagnetic transducers such as electromagnetic speakers, electrostatic speakers, electrostatic transducers such as piezoelectric speakers, or a combination of these as appropriate. . There is no particular limitation on the operating principle, shape, form, and size of the converter, and any converter can be used in the present invention as long as the user can perceive the modulated wave through his hearing. When the device of the present invention is used in a portable manner, small headphones or earphones are suitable.

A method of supplying a modulated wave generated by a modulated wave generating circuit to an electroacoustic converter is generally classified into two types. One of the methods is a modulated wave generating circuit and an electroacoustic converter. This is a wired system in which devices are directly connected by a cable or the like. In this method, the subject or his / her assistant usually operates electrical components including the modulated wave generating circuit at the place where the subject actually listens. In another method, an electrical component including a modulated wave generating circuit and an electrical component including an electroacoustic transducer are separately configured, and the output of the modulated wave generating circuit is transmitted by wireless communication or optical communication. This is a wireless system for supplying electrical components. In wireless systems, usually
The assistant operates the former electrical component at a place slightly away from the place where the subject actually listens. Fmθ
Although there is no substantial difference in either method, the latter method facilitates simultaneous audible stimulation of a plurality of subjects, and furthermore, the wireless method There is an advantage that the subject can move freely within the reach.

Next, the method of using the device according to the present invention will be described. In general, the audible stimulus of the device according to the present invention is slightly strong at first, and it is better to gradually reduce it. When the purpose of use is to improve attention and concentration during mental work, stimulation may be performed for an appropriate period of time before or during the work, as necessary. If the purpose is to prevent or treat diseases, etc., carefully observe the condition of the subject, for example, once to three times a day, with a maximum stimulation time of about 2 hours per time. It may last from one to seven days, one month to one year. Depending on the purpose of use and the subject, the sound pressure of the audible stimulus at that time is usually about 20 to 90 dB, preferably about 30 to 80 dB. The auditory stimulus according to the present invention is usually provided only from one ear.
There is no substantial difference in Fmθ inducibility when listening from both ears. When the audible stimulus of the present invention needs to be kept listening for a long time, for example, only one ear is audibly stimulated, or a changeover switch or the like is interposed between the oscillation circuit and the electroacoustic transducer, and this switching is performed. By operating the switch, the modulated sound may be heard by one ear and the unmodulated low frequency may be heard by the other ear. Note that, depending on the subject, the audible stimulus provided by the device of the present invention has a property of provoking the appearance of Fmθ even if the user continues listening for a long period of time, or listens for a very short period of time. For such a subject, the device of the present invention is useful as a means of so-called "mental training". Further, the device of the present invention provided with an electroacoustic transducer, for example, a radio receiver, a television receiver, and further, a record reproducing device, an audio tape reproducing device, a compact disc reproducing device,
When incorporated into an audio / video device such as a mini-disc reproducing device, a video tape reproducing device, or a video disc reproducing device, or a multimedia personal computer, etc., the audible stimulus and the music, etc. according to the present invention can be simultaneously or occasionally switched by one device. Can be.

Hereinafter, the present invention will be described in more detail with reference to illustrated embodiments and experimental examples.

[0016]

Embodiment 1 FIG. 1 is a block diagram of an electric component according to an embodiment of the present invention. In the figure, O1 and O2 are a first oscillation circuit and a second oscillation circuit, respectively, and usually an operational amplifier is used. The first oscillation circuit O1 generates a sine wave having a frequency of about 150 Hz, and the second oscillation circuit O2 generates a very low frequency having a sine wave waveform of about 2 to 10 Hz.
The second oscillation circuit O2 is provided with a variable resistor V1, which can be operated to change the very low frequency in the range of about 2 to 10 Hz. M is a modulation circuit, the input terminal of which is connected to the output terminals of a first oscillation circuit O1 and a second oscillation circuit O2. The low frequency and the very low frequency are amplitude-modulated here, and the output At the end, a modulated wave obtained by superimposing a very low frequency on a low frequency is derived.
The variable resistor V2 provided in the modulation circuit M is for adjusting the depth of the amplitude modulation. By operating the variable resistor V2, the modulation degree can be changed in a range of about 30 to 100%. The output terminal of the first oscillator circuit O1 is connected to the input terminal of the first amplifier circuit A1 via the switch S, and the output terminal of the modulation circuit M is connected to the input terminal of the second amplifier circuit A2 and the switch S. Connected to contact b. Headphones P as electroacoustic transducers are connected to output terminals of the first and second amplifier circuits A1 and A2 via connectors C which can be freely connected and disconnected. The variable resistors V3 respectively provided at the input terminals of the pair of amplifiers A1 and A2 are connected to the amplifiers A1 and A2.
1, for adjusting the magnitude of the audible stimulus radiated from the left and right speaker units in the headphones P by changing the magnitude of the electric signal applied to A2. The variable resistor V4 provided between the input terminals of the pair of amplifiers A1 and A2 radiates from the left and right speaker units in the headphones P by adjusting the magnitude of the electric signal applied to the amplifiers A1 and A2. This is to balance the audible stimulus that is performed.

To explain the operation of this embodiment, when the circuit is started with the changeover switch S at the position of the contact b, the outputs of the first and second oscillation circuits O1 and O2 are supplied to the modulation circuit M. You. The two outputs are mixed and amplitude-modulated here, and a modulated wave having a waveform as shown in FIG. As can be seen in FIG. 2, this modulated wave has a sinusoidal
A sine wave of 10 Hz to 10 Hz is superimposed. Modulation circuit M
Are amplified by the amplifiers A1 and A2, and energize a pair of speaker units in the headphones P. When the changeover switch S is connected to the contact a, the modulated wave is supplied only to the amplifier A2, and the amplifier A1 is supplied with a low frequency of about 150 Hz generated by the first oscillation circuit O1.
In this case, a modulated wave is radiated from one speaker unit in the headphones P, and an unmodulated sine wave is radiated from the other speaker unit.

Since the present embodiment is configured as described above, when the subject is operated with the headphones P mounted on his or her head, a sine wave having a frequency of about 150 Hz is applied to the subject's ears.
A modulated wave in which a sine wave having a frequency of about 2 to 10 Hz is superimposed on this sine wave can be heard.

[0019]

Embodiment 2 FIG. 3 is a block diagram showing an electric component of another embodiment according to the present invention for supplying an output of a modulated wave generation circuit to an electroacoustic transducer in a wireless manner. Symbols O1, O2, M, V1 through V in FIG.
Reference numerals 4, P and C are used to refer to the same circuits and circuit elements as those in the embodiment shown in FIG. 1, and their use purposes and functions are substantially the same.

As shown in FIG. 3, this embodiment includes a transmission system and a reception system. In the transmission system, the first oscillation circuit O
The modulated wave or the sine wave generated by the first and second oscillation circuits O2 and M is supplied to the input terminal of the stereo frequency modulation circuit FSM via the changeover switch S as in the previous embodiment. The frequency modulation circuit FSM generally has a low-frequency amplification circuit for amplifying a modulated wave or a sine wave applied to the input terminal, and an input terminal connected to an output terminal of the low-frequency amplification circuit. It is composed of a frequency modulation circuit for converting a modulated wave or a sine wave into a high frequency that is frequency-modulated based on the sine wave. A high frequency power amplifier circuit RF for appropriately amplifying the high frequency is provided at an output terminal of the frequency modulation circuit FSM.
The input terminal of P is connected, and the antenna ANT1 for radiating high frequency is connected to the output terminal of the high frequency power amplifier circuit RFP. The receiving system includes an antenna ANT2 for receiving a high frequency, a stereo-type receiving circuit FSR for demodulating a high-frequency voltage from the antenna ANT2 to an electric signal including an original modulated wave or a sine wave, and an output of the receiving circuit FSR. It includes a headphone P as an electroacoustic transducer for converting into an audible stimulus.

The operation of the present embodiment will be described. Since the present embodiment is configured as described above, when the receiving system is started while the transmitting system is operated, the pair of speaker units in the headphones P has a frequency of about 150 Hz. Or a modulated wave in which a sine wave having a frequency of about 2 to 10 Hz is superimposed on the sine wave.

In this embodiment, one or a plurality of receiving systems are provided for one transmitting system.
If the individual subjects carry this receiving system and operate it appropriately with the headphones P mounted on their heads, the modulated waves can be heard. This example is useful for auditory stimulation of a plurality of subjects simultaneously in a relatively large place.

Next, the operation and effect of the present invention will be specifically described with reference to experimental examples.

[0024]

[Experimental example] Five males and females aged 20 and under without neuropsychiatric disorders were examined, and stereo headphones were attached to their heads, and bioelectrodes for EEG measurement were fitted according to the International Electroencephalographic Society Union Standard Electrode Placement Method. did. Except for the electroencephalograph "1A97A type" manufactured and sold by NEC Sanei Co., Ltd. equipped with a data processing device for the bioelectrode for electroencephalogram measurement, and for the stereo headphones, the frequency range of ultra-low frequency was slightly expanded. The device manufactured in the same manner as in No. 2 was connected. next,
First, in a state where the subject is not audibly stimulated, a Kraepelin test (continuous one-point addition work) is applied for 15 minutes as a mental task, during which the brain waves of the subject are detected and amplified, and then manufactured by TEAC Corporation.・ Data recorder "XR
-710 type ". After the test in the first half was completed, the subject was allowed to rest for 5 minutes, and this time, while applying the audible stimulation, the latter half of the 15-minute Kraepelin test was applied, and during that time, the brain wave of the subject was detected in the same manner as described above. The resulting data was amplified and recorded on a data recorder. The sound pressure of the audible stimulus was set to be about 70 dB on the eardrum of the subject.

After the test is completed, the data recorded in the data recorder is added and processed nine times by a signal processor “7T18A” manufactured and sold by NEC Sanei Co., Ltd.
After the frequency analysis, the Fmθ of 10 subjects was averaged to 1
Displayed as a topograph per minute. At the same time, during mental work for 15 minutes each in the first half and the second half, the average intensity (micrometer) per minute for Fmθ derived from the F3, Fz and F4 sites on the subject's head for the first 15 minutes and the last 15 minutes, respectively. Volts), and substitutes the obtained average strength into Equation 1 for each part to obtain F
The mθ increase rate (%) was calculated. These topographs and Fm
The rate of increase in θ was used as a guide for determining the ability to induce Fmθ of each audible stimulus. The results are shown in Table 1 and FIGS.

[0026]

(Equation 1)

As a control, a system in which no audible stimulus is heard (hereinafter referred to as "control 1") and a system in which only a non-modulated wave, that is, a sine wave having a frequency of about 150 Hz is heard (hereinafter, referred to as "control 1"). 2 "). These controls were also tested in the same manner as described above.

[0028]

[Table 1]

As is clear from the results in Table 1, all audible stimuli commonly include a sine wave having a frequency of 150 Hz, but a remarkable difference was observed in the Fmθ increase rate. That is, when the frequency of the very low frequency is in the range of about 20 Hz or less, the Fmθ increase rate is remarkably increased in all parts of F3, Fz, and F4, and is about 130% of control 1 depending on the derived part. Had also reached. 4 and 5
Also demonstrates that Fmθ appears to be strong and widespread around the median frontal region of the subject when mental work is performed while audibly stimulating with the modulated wave according to the present invention. As can be seen from the results of Control 3 and Control 4 in Table 1, when the very low frequency exceeds 20 Hz, F
Cases in which no significant difference in mθ increase rate from control 1 or control 2 is observed, and some subjects complain of slight discomfort or decreased concentration, or a clear delay in progress of the Kraepelin test was there.

From the above experimental facts, it is understood that the very low frequency is suitable for a frequency of about 20 Hz or less, especially about 2 to 10 Hz. Although the data is not shown, the test was performed in the same manner as above while fixing the very low frequency at around 8 Hz and changing the low frequency appropriately within the range of 50 to 6,000 Hz. The Fmθ increase rate significantly increased when the frequency was about 100 to 500 Hz, and peaked when the frequency was about 120 to 200 Hz. Further, a modulated wave obtained by superimposing a sine wave having a frequency of about 8 Hz on a sine wave having a frequency of about 150 Hz was tested in the same manner as described above while appropriately changing the degree of modulation. At the time, the Fmθ increase rate reached a peak. In addition to sine waves, pulse waves such as sawtooth waves, square waves, triangle waves, and square waves were also tested.Pulses with relatively long durations were almost inferior to sine waves, but almost the same results were obtained. Was done.

Separately, the effects of the audible stimulus according to the present invention on the appearance of α-waves were tested on the above ten subjects. In other words, a bioelectrode for measuring electroencephalogram and stereo headphones are attached to the subject's head, and a sine wave having a frequency of about 150 Hz and a sine wave having a frequency of about 8 Hz are provided over a period of 60 minutes in a state where the subject is relaxed as much as possible and the eyes are closed. An audible stimulus was given by the superimposed modulated wave. And in the meantime,
The brain wave was detected by a conventional method, amplified, and then recorded on a data recorder. After the test was completed, the recorded data was subjected to frequency analysis, and the α-wave having a period of 8 to 10 Hz was displayed as a topograph per minute at intervals of 5 minutes for 20 minutes immediately after the start of the measurement. Three days later, exactly the same experiment was performed on the same subject, except that audible stimulation by the modulated wave was omitted. As a result, when the modulated wave according to the present invention audibly stimulates, a remarkable change appears in the α wave of the subject, and the α wave when no audible stimulus is seen in FIG. As shown in FIG. 7, when the audible stimulus was performed, the α wave was strong around the parietal portion of the subject at 15 minutes after the start of the audible stimulus, and it was recognized that the stimulus appeared extremely widely. At the same time, the appearance of β waves was also significantly suppressed. This tendency was not substantially changed even if the very low frequency was changed in the range of about 2 to 10 Hz.

These facts suggest that the audible stimulus according to the present invention not only promotes the appearance of Fmθ, but also has the effect of promoting the appearance of α waves and simultaneously suppressing the appearance of β waves. As described above, the α wave and the β wave are brain waves corresponding to relaxation or tension of mind and body, respectively.
When used with increased concentration and closed eyes, it induces α waves and suppresses β waves to relax and calm the mind and body.

As described above, since Fmθ is a good indicator of attention and concentration, the results of this experimental example show that the device of the present invention is used for mental work in general to enhance the attention and concentration of the user. It can be said that this suggests that the efficiency and accuracy of mental work are kept at a high level. This can be seen from the progress rate (%) of the Kraepelin test. As shown in Table 1, when audible stimulation was performed with the modulated wave according to the present invention,
The work progress rate (%) was significantly increased.

[0034]

According to the apparatus of the present invention, the modulated wave stimulates the appearance of Fmθ in the electroencephalogram when a human is stimulated through hearing. In particular, when the very low frequency is in the range of about 2 to 10 Hertz, not only Fmθ but also the appearance of α wave is promoted. Therefore, when the modulated wave according to the present invention stimulates a human through hearing, a desirable state of mind and body involving Fmθ and α waves,
In other words, it promotes improvement of attention and concentration, and further relaxation and relaxation of mind and body.

From the above, the device of the present invention is:
Not only improvement of attention and concentration, but also relaxation / rest and relaxation of mind and body, improvement of creativity, and further, for example, neurosis, mental weakness, psychosomatic disorder, manic-depressive disorder, chronic alcohol dependence Mental illness such as illness, or electromagnetic waves radiated from, for example, television receivers, video displays, OA equipment, automobile spark plugs, etc., so-called stress disorders including techno-stress, generally reduce thinking ability, concentration, and motivation to work. It is effective in reducing or relieving insomnia, malaise, intimidation, phobia, discomfort, etc. Therefore, the device of the present invention can be used in general homes, workplaces, stadiums, schools, study cram schools, driving schools, training schools, laboratories, ateliers, etc. for efficiency and accuracy of mental work, learning ability, academic research ability, creativity, Alternatively, as a way to increase concentration during the competition,
In clinics, hospitals, nursing homes, etc., it is useful as a means for preventing and treating various mental disorders including stress. Depending on the subject, if the audible stimulus according to the present invention is continuously listened for a long period of time, the appearance of Fmθ may be promoted even if the audible stimulus is heard for a very short time or not.
For such a subject, the device of the present invention is also useful as a so-called "mental training" means.

Thus, it can be said that the present invention is a significant invention that greatly contributes to the art.

[Brief description of the drawings]

FIG. 1 is a block diagram of electrical components in one embodiment of the present invention.

FIG. 2 is a waveform diagram of a modulated wave in the embodiment shown in FIG.

FIG. 3 is a block diagram of electrical components in another embodiment according to the present invention.

FIG. 4 is a topograph showing Fmθ when mental work is applied to a subject without audible stimulation.

FIG. 5 is a topograph showing Fmθ when mental work is applied to a subject while audibly stimulating with a modulated wave according to the present invention.

FIG. 6 is a topograph showing an α-wave when a subject is placed in a closed-eye sitting position without audible stimulation.

FIG. 7 is a topograph showing an α-wave when the subject is closed with his / her eyes closed while auditory stimulation is performed with a modulated wave according to the present invention.

[Explanation of symbols]

 O1, O2 Oscillation circuit A1, A2 Amplification circuit M Modulation circuit V1-V4 Variable resistance S Changeover switch C Connector P Headphone FSM Frequency modulation circuit RFP High frequency power amplifier circuit FSR receiver circuit ANT1, ANT2 Antenna

Claims (3)

(57) [Claims] A modulated wave obtained by superposing an ultra-low frequency of about 2 to 10 Hertz on a low frequency of an audible range of about 120 to 200 Hertz having a modulation degree of about 30 to 10 Hertz.
A modulation wave generating circuit for generating a modulation wave in a range of 0%;
An electroacoustic transducer connected to the output end of the modulated wave generation circuit and converting the modulated wave into an audible stimulus.
θ guidance device. 2. The modulation wave generating circuit according to claim 1, wherein the frequency is about 120 to
A first oscillating circuit for generating an audible low frequency of 200 Hertz, a second oscillating circuit for generating an ultra low frequency of about 2 to 10 Hertz , and output terminals of the first and second oscillating circuits It has an input terminal connected to the frequency from about 120 to 2
The low frequency of the audible range of 00 Hz is about 2 to 10 Hz.
And a modulation circuit that modulates at a very low frequency with a degree of modulation in the range of about 30 to 100%.
θ guidance device. 3. The sound pressure of an audible stimulus is about 20 to 90 dB.
The Fmθ guidance device according to claim 1 or 2 .