CN1606960A - Brain wave instrument for psychognosis - Google Patents
Brain wave instrument for psychognosis Download PDFInfo
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- CN1606960A CN1606960A CN 200310100622 CN200310100622A CN1606960A CN 1606960 A CN1606960 A CN 1606960A CN 200310100622 CN200310100622 CN 200310100622 CN 200310100622 A CN200310100622 A CN 200310100622A CN 1606960 A CN1606960 A CN 1606960A
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Abstract
Said invention relates to electronic test instrument especially a brain test instrument for psychology test and health supervision, which consists of brain electrode, signal acquisition and conversion circuit, computer, earphone and projector. The brain electrode put on head skin is connected with brain electric signal acquisition and conversion circuit through shielded wire then connected with computer. The projector and earphone are connected with computer output. By making stimulation (vision or audition ) to the testee, then taking event-related potential to analyzing from the real time collected brain wave signal by brain electrode on scalp, so making judgment to the body and mind state of testee. Said invention has wide paramodulation range of signal amplification, short test time and simple operation.
Description
Technical field
The present invention relates to electronic test instrument, particularly relate to the brain wave test set that can be applicable to psychological test and health supervision field.
Background technology
The instrument psychological test can trace back to 1895 the earliest, is that Italian guilty mind scholar's Cesare Lombroso (C.Lombroso) is used for psychological test with the graphic sphygmograph of water first, and this can be considered the trial the earliest with the instrument psychological test.But base was reined in the monitor of multinomial physical signs such as development continuous record blood pressure, pulse, breathing, skin electricity in 1949, made the accuracy that carries out psychological test with instrument obtain further raising.These early stage psychological testers often are called as the Polygraph psychological tester, or are simplified directly and match with Polygraph.At present, worldwide the psychological tester of widespread usage mostly is to adopt polygraph (Polygraph) to come the active physical signs of autonomic nervous system such as recording respiration, heart beating, skin electricity.But some special tested and seasoned clienies or experimenter deliberately take some counterreconnaissance means such as counter measure of Physiological Psychology often to make the Polygraph test very difficult.Because different experimenters' Physiological Psychology quality, ability of self control difference, responsive person easily produces false positive, and the ability of self control powerhouse is prone to false negative, and the attitude that the experimenter treats psychological test also can have influence on the result of test.These unavoidable defectives of Polygraph psychological test, its basic reason is exactly owing to adopted psychological physiological change: heart beating, breathing, blood pressure, skin resistance etc. are made index.These indexs are indirect, are not test brain itself.
Since 1875 Britain physiologist Ka Dun (Caton) on animal brain, record bio electricity, reported people's electroencephalogram, the history in existing more than 100 year so far for the first time to the nineteen twenty-nine sick scholar Bei Geer of Germanism (Berger).People once treated the electric wave that sends with wild with joy mood from brain, nature has been full of mystique to the electric wave of sending out from human brain, can what and it has been expressed very high expectation: people know from a people's E.E.G he is thinking some day? but, owing to be subjected to the restriction of science and technology level, this expectation fails to realize always.People such as nineteen sixty-five Sutton find P300 ripple (ERP current potential), and the P300 ripple is a main endogenous component relevant with psychological factor, also claim the meaning ripple and understand ripple.Through nearly 30 years research, people deepen continuously to the understanding of P300, it is research people's cognitive activities and the useful indicators of judging people's cognitive competence that P300 is now generally acknowledged, the scholar of the China and the U.S. finds, the all reflections to some extent on P300 of stimulus object and subjects's stake and subjects's emotion, and these variations of P300 are that the subjects is uncontrollable.P300 has become the main component of carrying out psychological test with brain wave, and this is the once breakthrough of contemporary psychological test research.
At present, at the research of ERP signal, mainly still adopt the superposed average method.But the superposed average method has stimulation often, the drawback that the testing time is long, and this has brought very big inconvenience to practical application.The method that the present invention then adopts wavelet analysis and independent vector analysis to combine is extracted brain electricity ERP, and adopt artificial intelligence technology to carry out analysis expert and judge, can significantly reduce essential brain electrode number and testing time like this, and the user is not had special background knowledge requirement.
Summary of the invention
The object of the invention is to provide a kind of brain electricity psychological tester, with stimulus sequences such as the picture that edits in advance, literal, sound, present to the subjects at random, and the EEG signals of gathering its head simultaneously in real time, then the brain wave potential change is carried out Algorithm Analysis, thereby the mental status of subjects when accepting a certain the stimulation passed judgment on.
For achieving the above object, technical solution of the present invention provides a kind of brain electricity psychological tester, form by brain electrode, signals collecting and change-over circuit, computer, earphone and projector, it is by the subjects being applied the stimulation of certain way, and the eeg signal that collects in real time of the brain electrode on being placed on scalp, extract corresponding event related potential and analyze, thereby subjects's physical and mental statuse is made judge.
Described brain electricity psychological tester, its brain electrode that is placed on the scalp is connected with change-over circuit with eeg signal acquisition by shielding line, links to each other with computer again; Projector links to each other with computer output with earphone.
Described brain electricity psychological tester, its eeg signal acquisition and change-over circuit are linked in sequence by preamplifier, wave trap, high pass amplifilter, low pass amplifilter and A/D converter and form; Eeg signal acquisition is connected the brain electrode that is placed on the scalp with the input of change-over circuit, and the outfan of A/D converter links to each other with computer by usb bus.
Described brain electricity psychological tester, its computer comprises data communication module, ERP extraction and analytical system, expert judging system and stimulates generation systems; Wherein, input termination data communication module, the data communication module extracts with ERP and analytical system is electrically connected, and ERP extracts and analytical system is electrically connected with expert judging system and stimulation generation systems respectively, the expert judging system is connected with display, stimulates generation systems to be connected with outfan.
Described brain electricity psychological tester, the extraction algorithm of ERP current potential adopts B-spline wavelets conversion and independent component analysis in its EEG signals.
Described brain electricity psychological tester, the stimulus information that presents on its projecting apparatus screen or the terminal display, by operator's pre-edit good after, be stored in hard disc of computer, again by main frame control broadcast.
Described brain electricity psychological tester, its described stimulation is the stimulation of vision or audible means.
Brain electricity psychological tester of the present invention adopts methods such as wavelet transformation and independent component analysis, and the testing time shortens, and signal extraction is effective, and is simple to operate.Eeg signal acquisition among the present invention and change-over circuit are finished for developing voluntarily, and signal amplification factor is high and adjustable, and the performance indications height can satisfy the collection of the real EEG signal of telecommunication fully.
Brain electricity psychological tester of the present invention can be used for public security organs, procuratorial organs and people's court office case investigation, also can be applicable to the application and the research of aspects such as neurological, neuropsychology, cognitive psychology, engineering psychology, criminal psychology.
Description of drawings
Fig. 1 is brain electricity psychological tester schematic diagram of the present invention;
Fig. 2 is the big filtering system structure chart of brain tele-release of the present invention;
Fig. 3 is that international standard 10-20 system brain electrode is placed bitmap;
Fig. 4 is brain electricity psychological tester workflow diagram of the present invention.
The specific embodiment
Realization schematic diagram of the present invention as shown in Figure 1.A kind of brain electricity psychological tester of partly forming by projector, screen, earphone, brain electrode, collection and change-over circuit, computer etc., the brain electrode that it is characterized in that being placed on the scalp links to each other with change-over circuit with brain wave acquisition by shielding line, collection links to each other with the computer input with change-over circuit again, and projector links to each other with computer output with earphone.
Described eeg signal acquisition and change-over circuit as shown in Figure 2, are linked in sequence by preamplifier, wave trap, high pass amplifilter, low pass amplifilter and A/D converter and form; Eeg signal acquisition is connected the brain electrode that is placed on the scalp with the input of change-over circuit, and the outfan of A/D converter links to each other with computer by usb bus.Eeg signal acquisition is connected in the following manner with change-over circuit: brain electrode is connected by the positive-negative input end of shielding line with precision instrument amplifier 1, the be connected in parallel outfan of amplifier 1 of resistance R 3, capacitor C 1, positive input terminal, the capacitor C 3 of the other end concatenation operation amplifier 2 of resistance R 3; Capacitor C 1, C2, C3 series connection, one end of resistance R 1 is connected with capacitor C 1, C2, the other end of R1 is connected with the end of potentiometer P2, one end of resistance R 2 is connected with capacitor C 2, C3, the other end of R2 is connected with the other end of potentiometer P2, and the adjustable end of potentiometer P2 is connected with outfan with the negative input end of operational amplifier 3, and the positive input terminal of operational amplifier 3 is connected with the adjustable end of potentiometer P1, the end ground connection of potentiometer P1, the other end is connected with negative input end, the outfan of amplifier 2; The outfan of operational amplifier 2 is connected with the input of high pass amplifilter, the outfan of high pass amplifilter is connected to the input of low pass amplifilter, the outfan of low pass amplifilter is connected with A/D converter again, is connected to main frame at last.
After tested, eeg signal acquisition and change-over circuit performance indications are as follows:
1) short circuit input noise: less than the 0.7uV peak-to-peak value;
2) band system band: 0.5～40Hz;
3) 50Hz trap: the decay be not less than 60dB (± 0.5Hz);
4) input impedance: can realize greater than 10
10Ω;
5) amplification: can realize more than 50,000 times, adjustable;
6) common mode rejection ratio: be not less than 110dB;
7) sample frequency: every helical pitch is 256Hz;
8) the electrode mode of leading: unipolar lead, bipolar lead is optional;
9) each interchannel isolation: be not less than 100dB;
Wherein the method for testing of interchannel isolation is: two input short circuits of (1) each passage preamplifier are write down the peak-to-peak value A of each passage short circuit output noise altogether
i(i=1 ..., n); (2) keep the short circuit of i passage input altogether, other passage makes its output be in full width of cloth duty, and writes down its peak-to-peak value P by regulating input signal, writes down the peak-to-peak value A of i passage output signal simultaneously
i';
(3) bring formula then into:
Interchannel isolation=(20 * log (A
i'-A
i/ P)) dB
(4) with quadrat method other each passage is tested;
Present state-of-the-art signal processing method---wavelet transformation and independent component analysis method are adopted in the extraction of ERP current potential (P300) in the described brain electricity psychological tester.
Brain of the present invention electricity psychological tester work process is as shown in Figure 4: at first, place recording electrode in Pz, Cz and Fz point by international standard 10-20 system, the earth polar places forehead central authorities, and reference electrode is sandwiched in ear-lobe, as shown in Figure 3.Before placing, electrode, make skin resistance less than 5K Ω with ethanol and ether mixed liquor defat decontamination.For the ease of data management, need set up subjects's personal files, comprising subjects's name, age, contact method, health status etc. to tested personnel.Enter the layout of stimulus sequence and the setting of stimulation generation systems then, according to two primary conditions of drawing brain electricity event related potential--the principle of-low probability (low-probability) and inter-related task (task-relevant), choose target stimulation and non-target stimulation, randomly stimulus sequence is carried out layout, and definite experiment number.After peripheral hardware equipment connects, just can carry out brain wave psychological test and data acquisition.Carry out collection of illustrative plates playback and Algorithm Analysis at last, comprise figure spectral editing, storage, brain electricity analytical and the feature extraction of ERP current potential, analysis expert judge etc., wherein wavelet transformation and independent component analysis method are adopted in the extraction of ERP current potential.
The subjects is at be upset (picture, literal etc.), and brain is inevitable movable, i.e. endogenous ERP potential change, and this current potential is relevant with people's the cognitive psychological course of processing, and the physical parameter that stimulates with incident has nothing to do.It is that the subjects is uncontrollable that this E.E.G changes.The subjects thinks control more, and his E.E.G is undesired more, because the idea itself of his this " thinking control " will produce distinguished E.E.G.Therefore, brain wave psychological test credibility is greatly improved.
Claims (7)
1, a kind of brain electricity psychological tester, form by brain electrode, signals collecting and change-over circuit, computer, earphone and projector, it is characterized in that, be by the subjects being applied the stimulation of certain way, and the eeg signal that collects in real time of the brain electrode on being placed on scalp, extract corresponding event related potential and analyze, thereby subjects's physical and mental statuse is made judge.
2, brain electricity psychological tester as claimed in claim 1 is characterized in that the brain electrode that is placed on the scalp is connected with change-over circuit with eeg signal acquisition by shielding line, links to each other with computer again; Projector links to each other with computer output with earphone.
3, brain electricity psychological tester as claimed in claim 2 is characterized in that eeg signal acquisition and change-over circuit are linked in sequence by preamplifier, wave trap, high pass amplifilter, low pass amplifilter and A/D converter and form; Eeg signal acquisition is connected the brain electrode that is placed on the scalp with the input of change-over circuit, and the outfan of A/D converter links to each other with computer by usb bus.
4, brain electricity psychological tester as claimed in claim 2 is characterized in that, computer comprises data communication module, ERP extraction and analytical system, expert judging system and stimulates generation systems; Wherein, input termination data communication module, the data communication module extracts with ERP and analytical system is electrically connected, and ERP extracts and analytical system is electrically connected with expert judging system and stimulation generation systems respectively, the expert judging system is connected with display, stimulates generation systems to be connected with outfan.
5, brain electricity psychological tester as claimed in claim 4 is characterized in that the extraction algorithm of ERP current potential adopts B-spline wavelets conversion and independent component analysis in the EEG signals.
6, brain as claimed in claim 2 electricity psychological tester is characterized in that, the stimulus information that presents on projecting apparatus screen or the terminal display, by operator's pre-edit good after, be stored in hard disc of computer, again by main frame control broadcast.
7, as claim 1 or 6 described brain electricity psychological testers, it is characterized in that described stimulation is the stimulation of vision or audible means.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310100622 CN1606960A (en) | 2003-10-13 | 2003-10-13 | Brain wave instrument for psychognosis |
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| CN 200310100622 CN1606960A (en) | 2003-10-13 | 2003-10-13 | Brain wave instrument for psychognosis |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411580C (en) * | 2005-12-02 | 2008-08-20 | 清华大学 | Objectively detected identity recognition method based on human brain memory character |
| CN102469961A (en) * | 2010-01-28 | 2012-05-23 | 松下电器产业株式会社 | Speech sound intelligibility evaluation system, method, and program |
| CN109288518A (en) * | 2018-08-16 | 2019-02-01 | 北京薏然阳光电子技术有限公司 | Brain cognition neural Function Appraising system and method based on EEG and ERPs |
| CN114403900A (en) * | 2022-02-08 | 2022-04-29 | 刘政博 | Electroencephalogram data automatic recording and analyzing system and method in electroencephalogram machine |
-
2003
- 2003-10-13 CN CN 200310100622 patent/CN1606960A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411580C (en) * | 2005-12-02 | 2008-08-20 | 清华大学 | Objectively detected identity recognition method based on human brain memory character |
| CN102469961A (en) * | 2010-01-28 | 2012-05-23 | 松下电器产业株式会社 | Speech sound intelligibility evaluation system, method, and program |
| CN102469961B (en) * | 2010-01-28 | 2015-05-13 | 松下电器产业株式会社 | Speech sound intelligibility evaluation system and method |
| CN109288518A (en) * | 2018-08-16 | 2019-02-01 | 北京薏然阳光电子技术有限公司 | Brain cognition neural Function Appraising system and method based on EEG and ERPs |
| CN114403900A (en) * | 2022-02-08 | 2022-04-29 | 刘政博 | Electroencephalogram data automatic recording and analyzing system and method in electroencephalogram machine |
| CN114403900B (en) * | 2022-02-08 | 2024-04-05 | 周口市中心医院 | Electroencephalogram data automatic recording and analyzing system and method in electroencephalogram machine |
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