WO2012173221A1 - 生体光計測装置、刺激提示方法、及び刺激提示プログラム - Google Patents
生体光計測装置、刺激提示方法、及び刺激提示プログラム Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
- A61B5/165—Evaluating the state of mind, e.g. depression, anxiety
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
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- the present invention relates to an apparatus that supports evaluation of a subject's mood state based on measurement data of a biological light measurement apparatus.
- Non-Patent Document 1 In a typical study using fMRI shown in Non-Patent Document 1, after showing a movie that induces a healthy person's mood, the frontal lobe activity of the individual's brain when performing the task “n-back task” is measured. And the result of evaluating the mood state is shown.
- the n-back task is a task that requires the function of human working memory (WM).
- WM human working memory
- Patent Document 1 discloses a living body light measuring apparatus that measures the inside of a living body using light having a plurality of wavelengths from visible to infrared and converts the information inside the living body into a two-dimensional image.
- the biological light measuring apparatus described in this document generates light with a semiconductor laser, guides the generated light through an optical fiber, irradiates the subject at a plurality of locations, and transmits the light transmitted or reflected through the living body at a plurality of locations.
- the detected light is guided to a photodiode by an optical fiber, and biological information such as blood circulation, hemodynamics, and hemoglobin concentration change is converted into a two-dimensional image from the detected light amount.
- Such a biological optical measurement device has a feature that it is non-invasive and low-restraint to a living body, and therefore, a large-scale brain activity measurement technique such as functional nuclear magnetic resonance imaging (functional magnetic resonance imaging (fMRI)) In comparison, it is suitable for evaluating an individual's mental state and biological information in a daily environment.
- a large-scale brain activity measurement technique such as functional nuclear magnetic resonance imaging (functional magnetic resonance imaging (fMRI))
- fMRI functional magnetic resonance imaging
- Patent Document 2 discloses a method for evaluating mental state and biological information in a daily environment using this biological light measurement technique. Similar to the fMRI study described above, the method described in this document is a linguistic WM task (a task that requires a phonological loop) and a non-linguistic WM task (a task that does not require a phonological loop). ) And the frontal lobe activity is measured by the biological optical measurement technique, but a task different from the n-back task is used.
- the n-back task recalls and responds to several previous stimuli in parallel with memorizing and holding the stimuli displayed on the screen one after another, but the linguistic and non-linguistic WM tasks used in this document are , Memorandum / retention and recall in WM task execution are separated in time.
- the characteristics of the frontal lobe activity shown in this document include the frontal lobe activity that accompanies memorization and retention of linguistic WM tasks, and the "depression-depression" obtained from the standardized questionnaire POMS (Profile of Mood State) shortened version Score (POMS_D) is negatively correlated with low recall.
- POMS Profile of Mood State
- POMS_D shortened version Score
- no significant correlation with POMS_D was obtained for frontal lobe activity associated with non-linguistic WM tasks, but both WM tasks basically reflect the same cognitive elements.
- the advantage of the method in this document is that there is no need to induce mood change before measurement, and that non-constrained and non-invasive living body light measurement technology is used. It is expected to objectively acquire an index that reflects the mood state and realize a self-check system for mental health measures.
- the biological optical measurement technology that visualizes the activity state of the brain is expected to be applied to provide information on the mental state of individuals such as mood and emotion. Compared with large-scale brain function imaging technology such as fMRI, It can be used in the environment. Conventionally, methods for evaluating daily mood states by obtaining biological signals for multiple types of cognitive tasks using biological light measurement technology have been proposed, but a method for presenting cognitive tasks and a series of measurement protocols have been established. Was not.
- the biological light measurement apparatus includes one or more light irradiating means for irradiating a subject with light, one or more light detecting means for detecting light transmitted or reflected by the subject, and the light irradiation.
- a plurality of measurement points constituted by a plurality of combinations of the means and the light detection means, a stimulus presentation unit for presenting a plurality of different types of tasks to the subject, and the intensity of the light detected by the light detection means.
- a calculation unit that calculates a hemoglobin signal based on changes in oxygenated hemoglobin and deoxygenated hemoglobin concentration inside the specimen, a storage unit that stores the hemoglobin signal, and various types of tasks that indicate the type and order of presentation in the storage unit.
- the stimulus presentation unit presents the first task one or more times based on the order of presentation described in the table, and then a plurality of times
- a hemoglobin signal at a predetermined measurement point for the first problem and a hemoglobin signal at a predetermined measurement point for the second problem are calculated, and a quantitative value using these hemoglobin signals is calculated.
- the biological light measuring device If the biological light measuring device according to the present invention is used, it is possible to evaluate a mood state in a daily environment. It is also possible to optimize the protocol for mood state acquisition.
- a means for optimizing a biological light measurement technique for evaluating a daily mood state is proposed. Specifically, based on the following findings made clear by the authors.
- the order of presenting multiple linguistic WM tasks is A
- multiple non-linguistic WM tasks multiple non-linguistic WM tasks
- the quantitative value of the frontal lobe activity associated with the memorization / maintenance of the linguistic WM task in the order B and the order A in the order of presenting the tasks is significantly higher in negative correlation with the depressed mood than in the order B.
- each measurement point 1001 on the cerebral cortex surface 410 is as shown in FIG.
- the regions corresponding to the left and right dorsolateral prefrontal cortex (DLPFC) are indicated by solid lines 411 and 412, respectively, and the region corresponding to the frontal pole near the center of the prefrontal cortex is surrounded by a broken line 413.
- Subjects are given two types of tasks: spatial working memory (WM) tasks and linguistic WM tasks, and the brain activity for each task is evaluated.
- FIG. 1 An outline of the spatial WM problem is shown in FIG.
- a stored image (S1) in which four or two are white squares and the others are gray squares is presented for 1.5 seconds.
- S1 a stored image in which four or two are white squares and the others are gray squares
- FIG. 5 is an example of 4 item conditions.
- S2 a white square recognition image
- the subject is taught to remember the position of the white square in the first stored image S1, and determines whether the white square in the recognition image S2 matches any of the stored positions of the white square.
- the number of tasks for each of the 4-item condition and 2-item condition is 8 and presented in a random order.
- FIG. 1 A stored image (S1) in which hiragana is arranged at four or two positions around the central fixation point is presented for 1.5 seconds.
- S1 stored image
- 2 item condition 2 item condition
- FIG. 6 is an example of 4 item condition.
- S2 a recognition image on which one katakana is displayed is presented.
- the subject memorizes the characters of the first stored image S1, and determines whether or not the katakana of the recognition image S2 that is presented next matches any of the characters that are first memorized.
- pseudonyms in S1 and S2 the subject is determined to store the phoneme information instead of the character form information.
- the number of tasks for each of the 4-item condition and 2-item condition is 8 and presented in a random order.
- the subject responds by pressing a button such as a controller or mouse.
- the order of performing each WM task was counterbalanced by the subjects. That is, half of the subjects are in the order A shown in FIG. 7A, and after executing the spatial WM task first and completing it, the linguistic WM task is performed. The remaining half of the subjects are in the order B shown in FIG. 7B, and after executing the linguistic WM task first and completing this, the spatial WM task is performed.
- an oxygenated Hb signal and a deoxygenated Hb signal are obtained from time series data measured for each channel of each subject.
- the task period is 8.5 seconds from the presentation of the first image (S1) of the WM task to the presentation of the second image (S2), and 15.5 before the task period and 16 seconds after the task period are added to 25.5. Cut out seconds as one block.
- the data of each block was baseline-corrected using a straight line obtained by first fitting the data for the first 1 second and the last 4 seconds in each block.
- the time to cut out as one block is not limited to the above, and the time length of the task and the acquisition time before and after the task can be changed as appropriate.
- the activity period was 5 seconds to 8.5 seconds after S1 presentation, and the average activity value of the oxygenated Hb signal in the activity period was obtained in each block. Furthermore, the t value calculated from the average activity value of all blocks was defined as “brain activity value”.
- the standardized questionnaire “POMS shortened version” (edited by Kazuhito Yokoyama, “POMS shortened version guidebook” POMS score reflecting the mood state in the past one week period was acquired using “Case Explanation”, Kaneko Shobo, 2005).
- the main active site is the area corresponding to the left and right dorsolateral prefrontal cortex (DLPFC).
- DLPFC is an area consisting of the middle frontal gyrus (Broadman's 46 field, BA46) and the like, and is known to be activated by the WM problem.
- the spatial characteristics of brain activity are similar in all task conditions, and no difference was found between the spatial WM task and the linguistic WM task due to the different task types. Moreover, the difference between tasks was not seen also about the time change of the Hb signal in an active region.
- the correlation between the brain activity value (t value) and the POMS score was classified and analyzed in the order of task execution (order A, B, see FIG. 7).
- order A first: spatial WM task, later: linguistic WM task
- the brain activity value associated with the spatial WM task showed a weak positive correlation with the POMS depression score, but there was no statistically significant difference (FIGS. 9A and 9B).
- order B first: linguistic WM task, later: spatial WM task
- the brain activity values associated with spatial WM tasks are statistically significant regardless of order.
- the linguistic WM task shows that the order A shows a statistically significant difference than the order B.
- FIG. 1 shows a schematic configuration diagram of a biological light measurement device according to the present invention.
- the living body light measurement apparatus includes one or a plurality of light irradiation units 1041 that irradiate a subject with light and one or a plurality of light detection units 1061 that detect light transmitted or reflected through the subject.
- the light irradiation means 1041 and the light detection means 1061 have a plurality of measurement points 1001 by a plurality of combinations.
- the biological light measurement apparatus according to the present invention includes a display unit 110 that presents a problem to the subject 100, a storage unit 109 that stores various information related to the method of presenting the problem and the result of the biological light measurement, and the types of problems in the storage unit.
- the stimulus presentation unit 1112 that controls the presentation of the problem to the display unit 110, the light irradiation of the light irradiation unit 1041, the light reception signal of the light detection unit 1061 is converted into a hemoglobin signal, and
- having an analysis unit 1113 refers to the information about the results of the stored optical measurement in the storage unit 109 for controlling the biological optical measurement unit 1111.
- the light irradiating means 1041 irradiates light of two wavelengths among wavelengths of about 600 to 900 nm that can pass through the living body.
- the specific irradiation method is as follows.
- Light source drive information generated in the biological light measurement unit 1111 in the calculation unit 111 is converted into an analog signal by the digital / analog converter 101 and converted into a light source drive signal by the modulator 102.
- the light source 103 or 104 (laser diode (LD) or LED (Light-Emitting Diode)) is caused to emit light by the light source drive signal, the light of the two wavelengths is mixed by the light mixer 105, and the light irradiation means 1041 is reached by the optical fiber 900.
- LD laser diode
- LED Light-Emitting Diode
- the guided object 100 is irradiated.
- the LD or LED that emits light of the two wavelengths is bundled in one package, and is directly brought into contact with the subject 100 to irradiate the subject 100.
- the light detection means 1061 guides light with the optical fiber 900 brought into contact with the subject and receives it with the light detector 106 (silicon photodiode, avalanche photodiode, photomultiplier, etc.), and the lock-in amplifier 107 and analog / digital.
- the received light signal is taken out by the converter 108 and sent to the biological light measuring unit 1111.
- the photodetector 106 and the analog / digital converter 108 are mounted in one package, and are directly detected by being brought into contact with the subject 100, and the biological light measurement unit 1111 performs digital signal lock-in processing with software. The light reception signal is extracted.
- the biological light measurement device calculates a brain activity signal at each measurement point 1001 of the subject 100 and a display unit 110 that presents a plurality of types of issues (first and second issues) to the subject 100.
- the stimulus presentation unit 1112 included in the calculation unit 111 presents a problem on the display unit 110 based on the table 800 recorded in the storage unit 109.
- An example of the table 800 is shown in a table 801 in FIG.
- the table 801 includes information indicating an issue number, an issue type (here, a spatial WM issue or a linguistic WM issue), and whether the issue is a first issue or a second issue.
- the spatial WM task is the first task and the linguistic WM task is the second task, as shown in the above “Research on the basis”.
- first and “second” indicate the order of presentation of the tasks, and means that the second task is presented after the first task is presented a certain number of times.
- the stimulus presentation unit 1112 reads task information to be presented from the table 801 in advance, and presents the task according to the order of presentation, for example, as shown in order A of FIG.
- the analysis unit 1113 included in the calculation unit 111 obtains a brain activity signal at each measurement point 1001 of the subject 100 for the first task and a brain activity signal at the measurement point 1001 of the subject 100 for the second task, respectively.
- the relative value of each brain activity signal is calculated.
- the analysis unit 1113 calculates the brain activity signal at the measurement point 1001 based on the mathematical formulas (Equation 1) and (Equation 2) in FIG.
- Act_1 (1), Act_1 (2),..., Act_1 (n) in (Equation 1) are the first block, the second block,..., The nth block for the first problem, respectively.
- each brain activity signal may be weighted as shown in Equation (Equation 4) in FIG.
- k1 and k2 in (Expression 4) are weighting coefficients for Mean_1 and Mean_2, respectively.
- the relative value calculation method may be a t value for a difference in brain activity signals for the first task and the second task.
- the calculation method of the t value is based on (Equation 5), where ⁇ _1 and ⁇ _2 are the standard deviations of the brain activity signals of each block for the first task and the second task, respectively, and n1 and n2 are respectively It is the number of blocks of the first problem and the second problem.
- the analysis unit 1113 stores the mood index D_index calculated as described above in the storage unit 109. Specifically, an ID for identifying a subject to be measured, a measurement date, a used task number, and a mood index D_index are stored in the storage unit 109 in association with each other as a table 803 in FIG. In addition, the analysis unit 1113 displays the calculated mood index D_index on the display unit 110 as shown in FIGS.
- FIG. 12 is an example in which a mood index is indicated by a face mark.
- the storage unit 109 stores a table 804 that associates mood indexes with face marks.
- the analysis unit 1113 After calculating the mood index D_index, the analysis unit 1113 refers to the table 804, reads it from the storage unit 109, and displays the corresponding face mark on the display unit 110 as shown in FIG. Also, the analysis unit 1113 refers to the table 803, reads the past mood index of the subject subject, selects the corresponding face mark with reference to the table 804, and mood index D_index as shown in FIG. It is also possible to display the graph and the associated face mark together.
- FIG. 13 is a similar example in which the above display example is a weather mark. The analysis unit 1113 selects a weather mark corresponding to the calculated mood index D_index with reference to the table 804 in FIG. It displays on the display part 110 like Fig.13 (a) (b).
- FIG. 13 is a similar example in which the above display example is a weather mark. The analysis unit 1113 selects a weather mark corresponding to the calculated mood index D_index with reference to the table 804 in FIG. It displays on the display part 110 like Fig.
- FIG. 14 shows an example in which the analysis unit 1113 reads a past mood index D_index from the table 803, associates it with a face mark in the table 804, and colors it with a color bar and displays it on the display unit 109.
- FIG. 15 is an example in which the display unit 110 displays an image that prompts the subject to take a rest when the analysis unit 1113 has a calculated mood index D_index below a certain standard.
- 16 is based on a table (not shown) similar to the tables 804 and 805 corresponding to the mood index D_index, the mood index D_index as a percentage (FIG. 16 (a)), and a bar plot (FIG. 16 (b)). ) Is an example shown in a five-step evaluation (FIG. 16C).
- the above configuration compares the brain activity signals for each of the different tasks, gives an optimal task presentation order for obtaining an index related to depressed mood, and displays the mood index on the display unit 110, thereby providing the subject with Gives feedback and provides an effect that allows the subject to recognize his / her objective mood state and changes.
- FIG. 18 is an example of a measurement setting screen, and shows an example in which a task number setting display 110 ⁇ / b> A is displayed on the display unit 110.
- the task number setting display 110A enables the stimulus presentation unit 1112 to input and set the number of times of presenting the first task and the second task.
- the stimulus presenting unit 1112 receives the input of the task number setting display 110A, and displays the first and second tasks on the display unit 110 for the set number of times, for example, according to a sequence as shown in FIG.
- the biological light measurement unit 1111 and the analysis unit 1113 perform measurement and analysis corresponding to the number of times. According to the present embodiment, it is possible to provide the number of task presentations according to the user's request.
- FIG. 3 shows a database 802 showing the difficulty level of the spatial and linguistic WM tasks and the corresponding brain activity values.
- the database 802 is stored in the storage unit 109.
- the activity type ID is associated with the task type and the difficulty level, and is obtained by many subjects for the task type and the difficulty level indicated by the activity value ID. The average and standard deviation of brain activity values are recorded.
- the database 802 is updated including newly measured brain activity values. Activity value IDs in the database 802 are recorded in association with each task in a table 801 indicating the order of stimulus presentation.
- the spatial WM task (first task) is determined when the brain activity signal enters a certain range obtained from the database 802 within a preset range of task presentation times. It is possible to end and shift to the linguistic WM task (second task).
- FIG. 19 is a flowchart showing the procedure of this embodiment.
- the stimulus presentation unit 1112 refers to the preset task presentation count or the task presentation count set in the task count setting display 110A in FIG. 18 and selects a task according to the count from the table 801.
- the number of times of presentation of the first task is N1
- the number of times of presentation of the second task is N2.
- the tasks selected from the table 801 are selected from those having the same activity value ID for the same type of tasks.
- the biological light measurement unit 1111 starts measurement of biological light
- the stimulus presentation unit 1112 displays the first problem on the display unit 110.
- step s1904 the analysis unit 1113 calculates the brain activity value for the first task, for example, according to the mathematical expression (Equation 1) of FIG.
- step s1905 it is determined whether or not the number of presentations of the first task has reached the set number of times N1, and if YES, the stimulus presentation unit 1112 “displays the second task” on the display unit 110. Is displayed, and the process proceeds to step s1907. If NO, the process proceeds to step s1906.
- step s1906 the analysis unit 1113 determines whether the brain activity value is within a certain range defined by the activity value ID.
- the analysis unit 1113 refers to the activity value ID of the database 802 stored in the storage unit 109 and determines whether the obtained brain activity value is within the range of the average value ⁇ standard deviation.
- the stimulus presenting unit 1112 displays a message “Move to the second task” on the display unit 110, and proceeds to step s1907.
- the process returns to step s1903 to present the first task.
- step s1907 the second task is presented, and in step s1908, the second task is presented until the set number N2 of presentations is reached.
- step s1908 If the number of presentations reaches N2 in step s1908, the process moves to step s1909, and the mood index D_index is calculated according to, for example, the mathematical expressions (Equation 1) to (Equation 3) in FIG. Thereafter, in step s1910, the mood index D_index is stored in the storage unit 109 and displayed on the display unit 110 by the method shown in FIGS.
- the second task by determining whether or not the brain activity value for the first task (spatial WM task) is in a certain range, the second task can be obtained even when the number of task presentation times set in advance is not reached. This makes it possible to shift to a task, reducing the measurement time and reducing the burden on the subject.
- the average value and standard deviation described in the database 802 are examples of statistical values for a large number of subjects, and instead of the average value and standard deviation, the median, standard error, Needless to say, it can be replaced with other statistical indicators.
- FIG. 20 shows an example in which a linguistic WM task is composed of alphabets instead of the linguistic WM task of FIG.
- uppercase letters of the alphabet are stored in the first image (S1), and it is determined whether one lowercase letter of the alphabet presented in the second image (S2) matches any of the letters stored in S1.
- S1 first image
- S2 second image
- FIG. 21 shows an example in which the linguistic WM task is composed of numbers and Chinese numerals instead of the linguistic WM task of FIG.
- Numbers are stored in the first image (S1), and it is determined whether one Chinese numeral presented in the second image (S2) matches any of the numbers stored in S1. According to the present embodiment, it is possible to perform a mood evaluation on a subject who is more familiar with kanji than Japanese as in the above embodiments.
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Abstract
Description
また、気分状態取得のためのプロトコルを最適化することが可能である。
(1)複数回の非言語性WM課題を呈示したのち、複数回の言語性WM課題を呈示する順序を順序A,複数回の言語性WM課題を呈示したのち、複数回の非言語性WM課題を呈示する順序を順序B、順序Aにおける言語性WM課題の記銘・保持に伴う前頭葉活動の定量値は、順序Bにおけるそれよりも、抑うつ気分との負の相関が有意に高い。
(2)非言語性WM課題の記銘・保持に伴う前頭葉活動の定量値は、順序A,Bとの間で統計的な差は見られない。
(根拠となる研究)
健常被験者40名に対し、下記に示す生体光計測および質問紙による気分スコアの取得を行い、課題を解決する知見を得た。
<方法>
<生体光計測>
図4(a)のような、15の光照射点1041と15の光検出点1061を交互に配置した3×10の生体光計測プローブ400を前頭葉領域に装着し、47の計測チャンネル(ch)から脳活動データとしてヘモグロビン(Hb)信号を取得する。このとき、大脳皮質表面410における各計測点1001の位置は図4(b)のようになり、各計測点1001のチャンネル番号を1-47まで付してある。特に、左右の背外側前頭前野(Dorsolateral prefrontal cortex:DLPFC)に相当する領域をそれぞれ実線411および412で、前頭前野中央付近の前頭極に相当する領域を破線413で囲んで示してある。被験者には空間性ワーキングメモリ(WM)課題と言語性WM課題の2種類を課し、それぞれの課題に対する脳活動を評価する。
<質問紙>
上述の課題呈示における被験者の脳活動の状態と気分との関連性を評価するために、被験者の気分を評価する標準化された質問紙「POMS短縮版」(横山和仁 編著、「POMS短縮版 手引きと事例解説」、金子書房、2005)を用いて、過去1週間の期間における気分状態を反映したPOMSスコアを取得した。この質問紙は、「気が張り詰める」「生き生きする」「悲しい」などの30項目に対して自分の気分に当てはまるものを、「まったくなかった」「少しあった」「まあまああった」「かなりあった」「非常に多くあった」の5段階から選択するものである。この回答から、被験者の気分「緊張―不安」「抑うつ―落ち込み」「怒り―敵意」「活気」「疲労」「混乱」の6つの尺度のPOMSスコアを得た。
<結果>
Hb信号を検討した結果、空間性WM課題、言語性WM課題ともに課題に同期した酸素化Hb信号の増加および脱酸素化Hb信号の減少が局所的に観察された(図8)。主な活動部位は左右の背外側前頭前野(Dorsolateral Prefrontal Cortex、DLPFC)に相当する領域である。DLPFCは、中前頭回(ブロードマンの46野、BA46)などから成る領域で、WM課題によって賦活することが知られている。脳活動の空間的特性はいずれの課題条件においても類似しており、空間性WM課題および言語性WM課題という課題の種類の違いによる差は確認されなかった。また、活動部位におけるHb信号の時間変化についても、課題間の差は見られなかった。
Claims (8)
- 被検体に光を照射する1つまたは複数の光照射部と、被検体を透過あるいは反射した光を検出する1つまたは複数の光検出部と、前記光照射部と前記光検出部の複数の組み合わせにより構成される複数の計測点と、被検体へ異なる複数種類の課題を呈示する刺激呈示部と、
前記刺激呈示部は、1回または複数回の第1の課題を呈示したのち、複数回の第2の課題を呈示するとともに、前記演算部は、前記第1の課題に対する所定の計測点の計測結果に基づくヘモグロビン信号と、前記第2の課題に対する所定の計測点の計測結果に基づくヘモグロビン信号を算出するとともに、これらのヘモグロビン信号を用いた定量値を算出することを特徴とする、生体光計測装置。 - 請求項1に記載の生体光計測装置において、特に、前記第1の課題として非言語性ワーキングメモリ課題、前記第2の課題として言語性ワーキングメモリ課題を用いることを特徴とする、生体光計測装置。
- 請求項1に記載の生体光計測装置おいて、特に、第1の課題および第2の課題の呈示回数を設定することを特長とする、生体光計測装置。
- 請求項1に記載の生体光計測装置において、特に、第1の課題に対する多数の生体光計測結果の統計値を有するデータベースを前記記憶部に有し、前記演算部において、前記第1の課題に対する前記生体光計測結果と前記データベースの前記統計値を比較し、前記第1の課題の継続または終了を判定することを特徴とする、生体光計測装置。
- 請求項1に記載の生体光計測装置において、
前記定量値を記憶する記憶部を備えることを特徴とする生体光計測装置。 - 被検体に光を照射する1つまたは複数の光照射部と、被検体を透過あるいは反射した光を検出する1つまたは複数の光検出部と、前記光照射部と前記光検出部の複数の組み合わせにより構成される複数の計測点と、被検体へ異なる複数種類の課題(第1の課題および第2の課題)を呈示する刺激呈示部と、前記光検出部で検出された光の強度から前記被検体の内部における酸素化ヘモグロビンおよび脱酸素化ヘモグロビン濃度変化に基づくヘモグロビン信号を算出する演算部と、前記ヘモグロビン信号を保存する記憶部と、前記記憶部内に課題の種類と呈示順序等を示す種々のテーブルとを有し、前記刺激呈示部は、前記テーブルに記載された前記呈示順序に基づき、1回または複数回の第1の課題を呈示したのち、複数回の第2の課題を呈示するとともに、前記演算部は、前記第1の課題に対する所定の計測点のヘモグロビン信号と、前記第2の課題に対する所定の計測点のヘモグロビン信号を算出するとともに、これらのヘモグロビン信号を用いた定量値を算出することを特徴とする、生体光計測装置。
- 生体計測装置により脳の状態を計測するための、表示部に視覚的刺激を呈示する刺激提示方法において、
複数回の非言語性ワーキングメモリ課題を呈示したのち、複数回の言語性ワーキングメモリ課題を呈示することを特徴とする刺激提示方法。 - 生体計測装置により脳の状態を計測するための、演算部により表示部に視覚的刺激を呈示させる刺激提示プログラムにおいて、
前記演算部が、所定の間隔で複数回の非言語性ワーキングメモリ課題を呈示させたのち、複数回の言語性ワーキングメモリ課題を呈示させることを特徴とする刺激提示プログラム
。
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