JPH0614908A - Psychological state measuring device - Google Patents

Abstract

PURPOSE:To provide a psychological state measuring device for judging the psychological state of a testee by emitting a light into the body of the testee, and measuring and analyzing the time change of oxygen concentration in the body on the basis of the time change of the transmitted light. CONSTITUTION:A multidimensional oxygen concentration measuring part 1 has a light emitting part 2 and light receiving part 3 having a plurality of measuring channels and emitting and receiving the light of a specified wavelength, a signal processing part 4 and a memory 6. It emits a light into the body of a testee and measures the time change of oxygen concentration in the body on the basis of the time change of the transmitted light. A Fourier transforming part 7 conducts the Fourier transforming processing of the time change of oxygen concentration, thereby determining the spectrum distribution to frequency, which is then stored in a memory part 8. Successively, a judging part 9 extracts the characteristic on the basis of the envelop of the spectrum distribution and compares the characteristic-extracted data with a correlation data determined on the basis of the envelop of the spectrum distribution of oxygen concentration change to a preset psychological state, thereby judging the psychological state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a psychological state measuring apparatus for quantitatively extracting a human psychological state with respect to an external stimulus or an external environment and determining the psychological state.

[0002]

2. Description of the Related Art Conventionally, there is known a technique of performing physiological measurement on each part of the human body and performing medical diagnosis for treating diseases based on the measured data (for example, Japanese Patent Laid-Open No. 2-196334). (See the official gazette).

In addition to the physical measurement of the human body only, the psychological state is quantitatively analyzed to make a useful medical treatment.

[0004]

However, in spite of the increasing demands from the past, it is extremely difficult to quantitatively analyze the abstract psychological state of human beings, and an effective means is not available. It was not developed.

[0005]

The present invention has been made in view of the above problems, and as a result of earnest research, it has been found that the psychological state of human beings and changes in the concentrations of hemoglobin HbO ₂ and Hb in the body. Focusing on the fact that there is a certain correlation with the obtained oxygen concentration in the body, the psychological state of human beings is quantitatively extracted based on the change characteristics of the oxygen concentration, and the psychological state is determined from the result of the characteristic extraction. It was done like this.

That is, the measuring means for measuring the temporal change of the transmitted light when the light is radiated into the body of the subject, and the temporal change of the oxygen concentration in the body based on the transmitted light, and the oxygen measuring means. A transforming means for obtaining a spectrum distribution with respect to a frequency by performing a Fourier transform process on the temporal change of the density, and a feature is extracted based on the envelope of the spectrum distribution, and the feature-extracted data is set to a preset psychology. The analysis means for judging the psychological state is provided by comparing with the correlation data obtained based on the envelope curve of the spectrum distribution of the oxygen concentration change in the body in the state.

[0007]

According to the psychological state measuring apparatus having such a configuration, the measuring means measures a temporal change in the body oxygen concentration of the subject, and the converting means converts the concentration change into a spectrum distribution on the frequency axis, The analysis means performs feature extraction from the spectrum distribution to determine a predetermined psychological state. Here, the analysis means has correlation data that has been experimentally obtained in advance based on the envelope of the spectrum distribution of changes in the oxygen concentration in the body in the psychological state of the subject to various external stimuli, etc. The psychological state of a specific subject is determined by comparing the above-mentioned feature extraction data obtained when diagnosing the subject and the correlation data.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the apparatus will be described with reference to FIG. 1. The multidimensional oxygen concentration measurement unit 1 has a plurality of measurement channels, and each measurement channel has a light emitting unit 2 that emits light of a specific wavelength and a light receiving unit that receives light. The light receiving unit 3, the signal processing unit 4, and the storage unit 5 are provided. In the figure, one measurement channel is shown as a representative.

An irradiation optical probe having an optical transmission path for transmitting the emitted light is connected to the light emitting section 2 of each measurement channel, and the light receiving section 3 of each measurement channel receives the light. A light-receiving optical probe having an optical transmission line for transmitting light is connected. In the figure, a plurality of irradiation optical probes and light reception optical probes connected to a plurality of measurement channels are collectively indicated by reference numeral 6.

Then, the tip of the irradiation optical probe and the tip of the light receiving optical probe of each measurement channel are directly attached to, for example, the forehead or the head close to the part (for example, the frontal lobe) related to the subject's thought (for example, frontal lobe). When measurement is performed, light is emitted from the tip of the irradiation optical probe toward the frontal lobe, etc., and the human body (frontal lobe)
The transmitted light transmitted through the inside is input to the light receiving unit 3 via the light receiving optical probe. Further, as shown in the figure, multi-dimensional measurement can be performed by simultaneously applying the irradiation optical probe and the light receiving optical probe of a plurality of measurement channels.

The signal processing unit 4 measures the concentrations of hemoglobin HbO ₂ and Hb in human blood based on the respective attenuation amounts of the three wavelength components of the light measured by the light receiving unit 3, and changes the respective concentrations with time. And the temporal change of the sum [HbO ₂ + Hb] of the respective components are A / D converted into digital data and stored in the storage unit 5. The concentrations of the hemoglobins HbO ₂ and Hb correspond to the concentration of oxygen in the body, and the hemoglobins HbO ₂ and Hb in blood are based on the respective attenuation amounts of the three wavelength components of light.
The same principle as that of the product (model number NIR0-500) manufactured by Hamamatsu Photonics KK is applied to the principle of measuring the concentration.

The Fourier transform unit 7 stores the data of the hemoglobin HbO ₂ temporarily stored in the storage unit 5 (hereinafter, DA (t)).
And the data of hemoglobin Hb {hereinafter, DB
(t)} and the sum data of these components {hereinafter, D
C for each high-speed digital Fourier transform of a (t)} (DFFT) performs a Fourier transform data F _A data DA (t) (f), the Fourier transform data F _B data DB (t) (f) And the Fourier transform data F of the data DC (t)
_C (f) is stored in the storage unit 8.

The analysis unit 9 obtains the spectrum envelope of each of the Fourier transform data F _A (f), F _B (f), and F _C (f) stored in the storage unit 8, and the peak portion of this envelope line. And the heights of the valleys and the frequency ranges of these portions are extracted as feature data. Further, as shown in FIG. 2, the analysis unit 9 includes statistical data S1 to Sn of psychological states when various external stimuli are given to an unspecified number of subjects, and the external stimuli and the like. Correlation data with the characteristic data X1 to Xn obtained by statistically processing the peaks and valleys of the spectrum envelope and the frequency ranges of these portions for the concentration changes of the hemoglobins HbO ₂ and Hb obtained for A built-in database is stored in advance in the form of a lookup table or the like.

Then, the analysis unit 9 compares the characteristic data of the spectrum envelope obtained when the specific subject is measured in the actual examination or the like with the correlation data of the database to check the external stimulus or the like. The type and the psychological state of the subject are determined and the determination result is output.

The control unit 10 allows the operator to manually input not only the typical correlation data stored in the database but also other determination parameters. That is, the database of the analysis unit 9 stores the correlation data obtained for an unspecified number of subjects, but since these correlation data are typical data statistically processed, the actual It is possible to perform processing such as fine adjustment or change of various parameters of the correlation data, which is the criterion, according to the individual difference of the subject. Further, since it is possible to perform processing such as fine adjustment or change of various parameters of the correlation data, by operating the control unit 9, it is possible to newly create correlation data for a specific subject or to perform another processing. Correlation data for a large number of unspecified subjects can be newly created, and further, the operator can support processing such as personal psychological and medical experiments.

Next, the operation of the psychological state measuring apparatus having such a configuration will be described. First, various parameters of the correlation data stored in the discrimination unit 9 as a database will be described. As a database, in various research institutes, an experiment in which the psychological state measuring apparatus of the present invention shown in FIG. 1 is applied to an unspecified number of subjects, and typical correlation data obtained by statistical processing thereof is obtained. Semiconductor read-only memory (ROM)
Alternatively, a determination operation can be performed by mounting these various recording media on the analysis unit 9 of each psychological state measuring device stored in various recording media such as a magnetic recording medium and a magnetic disk and owned by each user. Become. Also, as mentioned above,
When the user operates the control unit 10 to personally create a database, the determination operation becomes possible. The principle of any database creation procedure is as described below.

First, as shown in FIG. 1, a state in which a large number of unspecified individual subjects for creating correlation data are fitted with irradiation light probes and light reception light probes and various external stimuli are applied thereto. Measure with. For example, various inspection methods such as calculation of the Kraepelin test, in which the correlation between the external stimulus and the psychological state of the human being against it is psychologically and medically verified, are applied.

When such an external stimulus or the like is given to the subject for measurement, the subject is irradiated with light through the irradiation optical probe, and the transmitted light transmitted through the frontal lobe of the subject is changed. The signal processing unit 4 inputs to the light receiving unit 3 via the light receiving optical probe, and the signal processing unit 4 stores, in the storage unit 5, data on the temporal concentration changes of the hemoglobins HbO ₂ and Hb and the sum [HbO ₂ + Hb] of these. Store.

FIGS. 3 (a) to 3 (e) show an example of the temporal concentration change of hemoglobin HbO ₂ when a certain subject is made to calculate the Kraepelin test five times in a relatively short time. The horizontal axis indicates the measurement time (seconds), and the vertical axis indicates the concentration (μmo
1 / l). Then, from the measurement start time point t1, time points t2, t3, t4, t5, t6 in each of the figures (a) to (e).
If the calculation of the Kraepelin test is performed during the period up to and the calculation is stopped after these time points t2, t3, t4, t5, and t6, the concentration of hemoglobin HbO ₂ increases during the calculation, The result is that if no calculation is performed, it will decrease. That is, the concentration of hemoglobin HbO ₂ increases in a stressed or stressed psychological state,
On the contrary, a correlation that the concentration of hemoglobin HbO ₂ decreases in a relaxed state was confirmed from such experimental results, and data indicating such a correlation is stored in the storage unit 5.
Will be stored in.

Further, FIG. 4 shows a case where measurement is performed by applying another kind of external stimulus. This is an example of measurement when the above calculation is continuously performed for a long time. )
Indicates changes in the concentration of hemoglobin HbO ₂ , changes in the concentration of hemoglobin Hb in the same figure (b), and sum of these [H
bO ₂ + Hb], showing the change of the Kraepelin test in the tension state at the time points t1 to t2.
Then, let the calculation be performed in a relaxed state, and at the time t
At 3 to t4, the case where the calculation of the Kraepelin test is performed again in the tension state is shown. Incidentally, the mark “Δ” in the figure indicates that almost the same number of calculations were performed every 40 seconds. It is clear from FIG. 4 that the concentration of hemoglobin HbO ₂ increases in the tense state, while the concentration of hemoglobin Hb decreases temporarily and the hemoglobin HbO ₂ is relaxed in a relaxed state regardless of the amount of calculation for each predetermined time. The concentration of ₂ decreases, and further
The total amount of hemoglobin [HbO ₂ + Hb] in the frontal lobe is
It can be seen that there is a correlation that increases in tension and decreases in relaxation.

Further, similarly in FIG. 5, the measurement was carried out for a long time, and FIG. 5 (a) shows a change in the concentration of hemoglobin HbO ₂ .
The figure (b) is a change in the concentration of hemoglobin Hb, and the figure (c).
Shows the change in these sums [HbO ₂ + Hb]. In the period τa, almost the same number of Kraepelin tests were calculated every 40 seconds in the tension state, and in the period τb, the calculation was stopped to relax. Indicate the case. It is clear from FIG. 5 that the amplitude change in the concentrations of the hemoglobins HbO ₂ and Hb becomes small when the calculation work is performed with tension, and conversely, the amplitude change becomes large in a relaxed state where nothing is done.

Further, FIG. 6 shows the measurement results when an English-Japanese translation was performed as another thinking task. The figure (a) shows the concentration change of hemoglobin HbO ₂ , and the figure (b) shows the concentration of hemoglobin Hb. The change in the figure (c) is the sum of these [HbO ₂
+ Hb], a calculation work of about 2 minutes is performed in the period τa, a rest of about 1 minute 30 seconds is taken in the period τb, and a calculation work of about 9 minutes is performed in the period τc. The following shows the case where they are combined. It is clear from FIG. 6 that the amplitude change of the hemoglobin concentration is small in the work of the relatively short period of the period τa, the amplitude change is small in the rest period τb, and the period τa in the first half of the period τc. It can be confirmed that the change in the amplitude of the concentration is small, but the change in the amplitude is large in the latter half, and the psychological state changes according to the change in the work amount.

As described above, various kinds of external stimuli are applied and the measurement is performed by the multidimensional oxygen concentration measuring apparatus 1 of FIG. 1 under the respective conditions. For example, the period τa of FIG.
The data DA (t) of hemoglobin HbO ₂ in a tension state as shown in Fig. 7 and the data DA (t) of hemoglobin HbO _{2 in} a state of feeling mental fatigue as shown by a period τc in Fig. 7C. , Data DA of hemoglobin HbO ₂ in a relaxed state as shown in period τe of FIG. 7 (e)
(t) and the other data DB (t) and DC (t) described above are stored in the storage unit 5.

The Fourier transform section 7 is a data D of the hemoglobin HbO ₂ corresponding to various conditions stored in the storage section 5.
A (t), the data DB (t) of the hemoglobin Hb, and the sum data DC (t) are each subjected to a fast digital Fourier transform, and the Fourier transform data F of the data DA (t) is obtained.
_A (f) and Fourier transform data F of the data DB (t)
_B (f) and Fourier transform data F _C (f) of data DC (t)
Is generated and stored in the storage unit 8. That is, FIG. 7 (a)
When the data DA (t) of FIG.
As shown in, the peak of the spectrum at low frequency (peak)
When the data DA (t) of FIG. 7 (c) is Fourier transformed, two peaks of the spectrum are generated at the low frequency and the high frequency as shown in FIG. 7 (d). When the data DA (t) of e) is Fourier-transformed, some peaks of the spectrum are generated as shown in FIG. 7 (f).

The analysis unit 9 obtains the envelope of the spectrum distribution as shown in FIGS. 7B, 7D and 7F, and the heights H _{1 to} H ₆ of the peaks and the frequency ranges W _{1 to} W ₆ etc. Are extracted as feature data for each external stimulus. Then, by statistically processing a large number of analysis results of a large number of unspecified subjects, typical characteristic data for external stimuli and the psychological state of the subjects are created, and a database that uses these as correlation data is created. create. Then, the database of the correlation data created in this way is attached to the analysis unit 9 of the psychological state measuring device owned by each user.

Next, the operation when a specific subject is examined by the psychological state measuring device owned by each user will be described. In this case, the current psychological state is determined by measuring the subject without applying external stimulus or the like.

When the measurement is started, light is illuminated on the subject via the illumination optical probe, the transmitted light is measured via the light receiving optical probe, and the signal processing unit 4 causes the hemoglobin HbO ₂ to be measured. The data of the temporal concentration change of Hb and Hb and the temporal change of the total amount [HbO ₂ + Hb] are held in the storage unit 5. Then, the Fourier transform unit 7 Fourier transforms these data and stores them in the storage unit 8. Further, the analysis unit 9 obtains the spectrum envelope of the Fourier transform data in the storage unit 8 to extract the characteristic data of the mountain portion and the frequency range, compares and collates the characteristic data with the correlation data of the database, and the closest correlation data. Then, the psychological state of the subject is determined, and the determination result is output.

When a definite determination result cannot be obtained due to individual differences among the examinees, the operator controls the control unit 1
When data of various characteristic parameters different from the correlation data of the database is input from 0, the determination result corresponding to the most approximated characteristic parameter is output.

As described above, according to this embodiment, the temporal change in the hemoglobin concentration (that is, the oxygen concentration in the body) of the subject is measured, the concentration change is converted into the spectrum distribution on the frequency axis, and By extracting features from the spectrum distribution and comparing and referring to the correlation data of each spectrum distribution with respect to various external stimuli that were experimentally obtained in advance, the psychological state was determined.
It becomes possible to easily analyze the human psychological state. As a result, it is safe to measure the psychological state of workers who are working in factories and to grasp the work status, to have a rest depending on the degree of mental fatigue, and to improve the work content. It can be used in a wide range of fields such as use for securing purposes and medical diagnosis.

In this embodiment, the case where the measurement site of the subject is the head has been described, but the present invention is not limited to this, and the measurement site may be applied to other sites.

Further, the types of external stimuli to the subject shown in this embodiment are merely examples, and the types are not limited to these, and those that are psychologically and medically proven should be applied. Is possible.

[0032]

As described above, according to the present invention, the time-dependent change in the oxygen concentration in the body of a subject is measured, and the change in the concentration is converted into a spectrum distribution on the frequency axis. Correlation data obtained based on the envelope of the spectrum distribution of changes in the oxygen concentration in the body in the psychological state of the subject to various external stimuli obtained in Since the psychological state of the specific subject is determined by comparing with the feature extraction data, it becomes possible to easily measure the human psychological state.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of a psychological state measuring apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a data format of correlation data provided in advance in an analysis unit.

FIG. 3 is a diagram showing an example of experimental data showing that there is a correlation between a human psychological state and a body oxygen concentration.

FIG. 4 is a diagram showing another example of experimental data showing that there is a correlation between a human psychological state and a body oxygen concentration.

FIG. 5 is a diagram showing still another example of experimental data showing that there is a correlation between the human psychological state and the oxygen concentration in the body.

FIG. 6 is a diagram showing still another example of experimental data showing that there is a correlation between the human psychological state and the oxygen concentration in the body.

FIG. 7 is an explanatory diagram for explaining the principle of feature extraction and the principle of psychological state determination in the psychological state measuring apparatus of the embodiment.

[Explanation of symbols]

1 ... Multi-dimensional oxygen concentration measuring unit, 2 ... Light emitting unit, 3 ... Light receiving unit,
4 ... Signal processing unit, 5 ... Storage unit, 6 ... Illumination optical probe and light receiving optical probe, 7 ... Fourier transform unit, 8 ... Storage unit,
9 ... Analysis unit, 10 ... Control unit.

Claims (1)

[Claims] 1. A measuring means for irradiating light into the body of a subject and measuring a temporal change of oxygen concentration in the body based on a temporal change of transmitted light, and a temporal change of the oxygen concentration. A Fourier transform processing to obtain a spectrum distribution with respect to frequency, and a feature is extracted based on the envelope of the spectrum distribution. The feature-extracted data is used to change the oxygen concentration with respect to a preset psychological state. A psychological state measuring device, comprising: an analyzing unit that determines a psychological state by comparing the correlation data obtained based on the envelope curve of the spectrum distribution of FIG.