CN108469896A - A kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature - Google Patents
A kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature Download PDFInfo
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Abstract
The brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature that the present invention relates to a kind of, which is characterized in that include the following steps：Step 1, structure induces stimulating module in brain machine interface system；Step 2, the induction stimulating module send out hybrid coding signal to tester according to demand and form EEG signals；Step 3, acquisition module after amplifying to EEG signals, being filtered by forming data information；Data information is converted into instruction set and exported by step 4, the decoder module；This method, to the asymmetrical characteristic of stimuli responsive, divides in conjunction with space division multiple access, CDMA, frequency division multiple access and mutually the coding strategies such as multiple access, effective expansion system instruction set number according to brain bioelectrical activity.
Description
Technical field
The present invention relates to brain-computer interface systems technology fields, and in particular to a kind of brain-machine based on asymmetric brain electrical feature
Interface hybrid coding normal form.
Background technology
Brain-computer interface (Brain-Computer Interface, BCI) is one and directly turns central nervous system activities
The system manually exported is turned to, it can substitute, repair, enhance, supplement or improve the normal output of central nervous system, from
And improve the reciprocation between central nervous system and internal and external environment.By the brain for acquiring and analyzing subject under different stimulated
Electric signal reuses certain engineering technology means and sets up exchanging between human brain and computer or other electronic equipments and control
Channel processed.BCI technologies realize a kind of completely new information exchange and control mode, can be disabled person's especially those basic limbs
Body motor function is damaged but the patient having a normal thinking provides a kind of approach with extraneous progress communication and control, makes their nothings
It need to carry out language or limb action can be the same as extraneous exchange or manipulation external device.For this purpose, BCI technologies are also increasingly by weight
Depending on.
In brain-computer interface systematic research, the normal form application induced using visual stimulus is more universal, wherein being based on thing
In part related potential (Event-Related Potential, ERP) P300-speller of P300 features and be based on stable state vision
The SSVEP-BCI of Evoked ptential (Steady-State Visual Evoked Potential, SSVEP) is most widely used,
Its relevant technologies has developed relatively stable and ripe.Since EEG signals have non-linear and non-stationary feature, from
One of the important technology that faint EEG signals are characterized in BCI systems is extracted in complicated background brain electricity, in order to overcome brain electricity to carry on the back
Scape noise, traditional BCI normal forms generally use strong stimulation induce, and call a large amount of related Neurons activation to induce amplitude bigger, spy
More obvious brain electrical feature is levied, as the stimulation area of tradition SSVEP-BCI occupies user perspective range to other than 4 °, according to view
Film-cortex figure calculates, and individually stimulation activation primary visual cortex region area reaches 1300mm under the normal form2, traditional P300-
The target stimulation activation area of speller reaches 160mm2, and the performance of the two can be substantially reduced because of the reduction of Cortical activation area,
Therefore the BCI systems of traditional view-based access control model Induced by Stimulation have that stimulation area is big, intensity is high, occupy more than cognitive resources, no
The operation that long-time multitask is carried out conducive to user limits the further development and application of BCI technologies.
Asymmetric visual evoked potential (asymmetric Visual Evoked Potential, aVEP) is as asymmetric
The Typical Representative of brain electrical feature, belongs to atomic weak laterality visual evoked potential, and amplitude is usually less than 1 μ V.According to brain vision
The space offside advantages characteristic of stimuli responsive, aVEP can be generated by the unilateral Induced by Stimulation for appearing in circle-of-sight visibility, in this patent
It, will be for inducing aVEP features in book in Part V technical solution, brain-machine of the specific explanations based on asymmetric brain electrical feature
The detailed process of interface normal form design.
Invention content
It is an object of the invention to overcome defect existing for above-mentioned background technology, provide a kind of based on asymmetric brain electrical feature
Brain-computer interface hybrid coding normal form method, this method according to brain bioelectrical activity to the asymmetrical characteristic of stimuli responsive, knot
It closes space division multiple access, CDMA, frequency division multiple access and mutually divides the coding strategies such as multiple access, effective expansion system instruction set number, for brain-
The development of machine interface system provides new direction.
Technical scheme of the present invention:
A kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature, which is characterized in that including as follows
Step：
Step 1, structure induces stimulating module in brain-computer interface system；
Step 2, the induction stimulating module send out hybrid coding signal to tester according to demand and form EEG signals；
Step 3, acquisition module after amplifying to EEG signals, being filtered by forming data information；
Data information is converted into instruction set and exported by step 4, the decoder module.
Step 2 divides multi-address coding in space division multiple access basis of coding edit code.
The hybrid coding for inducing stimulating module generation includes space division multiple access coding, CDMA coding, frequency division multiple access
Be mutually divided in multiple access at least arbitrary two kinds of coded combinations.
The hybrid coding for inducing stimulating module generation includes space division multiple access coding, CDMA coding, frequency division multiple access
With mutually divide multiple access.The hybrid coding combined strategy includes：It is " left/right " code that the space division multiple access, which is compiled,；The CDMA is compiled
Code is " 0/1 " CDMA dibit encoding；The frequency division multiple access is encoded to " 12Hz (single stimulation time 83.33ms's), 13
(single stimulation time 76.92ms's), 14 (single stimulation time 71.43ms'), 15 (single stimulation time 66.67ms'),
16 (single stimulation time 62.5ms') ", five kinds of frequencies mutually divide multi-address coding " 0 °/90 ° " codings with described, you can realize
The hybrid coding strategy of 2x2x5x2=40.
Compared with prior art, the present invention has the advantage that：
1, the novel brain-computer interface normal form based on asymmetric brain electrical feature that the present invention designs is utilized brain and is rung to stimulation
The spatial dissymmetry answered carries out sky to stimulation instructions, code, frequency, mixes coding, and the different parameters of normal form are adjustable to adapt to not
With user demand and different application scene, and the normal form is not limited to the vision induced system illustrated in technical solution, also
It can be applied to the different brain-computer interface systems such as brainstem auditory evoked, body-sensing induction；
2, the instruction set number that brain-computer interface system can be effectively extended using this method helps further to improve brain-machine
Interfacing promotes the technology to be converted to application achievements.
Description of the drawings
Fig. 1 is midbrain of the present invention-machine interface system structural schematic diagram.
Fig. 2 is that the visual field divides in the present invention and schematic diagram is presented in stimulation.
Specific implementation mode
Below by specific embodiments and the drawings, the present invention is further illustrated.The embodiment of the present invention is in order to more
So that those skilled in the art is more fully understood the present invention well, any limitation is not made to the present invention.
Brain laterality is a key areas in Cognitive Neuroscience, since brain structure and the laterality of function are imitated
It answers, the brain electrical feature that different stimulated induces is there is also asymmetry, such as the asymmetric visual evoked potential that visual stimulus induces,
Reflect the asymmetry of neuron activity between brain hemispheres.
The purport of the present invention is to propose that a kind of asymmetric brain electrical feature applied to brain-computer interface system induces normal form, profit
With brain to the space offside of stimuli responsive be dominant characteristic to instruction carry out CDMA (Code Division Multiple
Access, CDMA) and space division multiple access (Space Division Multiple Access, SDMA) hybrid coding, it introduces simultaneously
Frequency division multiple access (Frequency Division Multiple Access, FDMA) with mutually divide multiple access (Phase Division
Multiple Access, PDMA) coding strategy, effective expansion system instruction set number, what further research can improve
Brain-computer interface system is expected to obtain considerable Social benefit and economic benefit.This invention can be used for disability rehabilitation, electricity
The fields such as sub- amusement, Industry Control, further study the brain-computer interface system that can be improved, are expected to obtain considerable society
It can benefit and economic benefit.It is realization process of the present invention as follows：
A kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature, which is characterized in that including as follows
Step：
Step 1, structure induces stimulating module in brain-computer interface system；
Step 2, the induction stimulating module send out hybrid coding signal to tester according to demand and form EEG signals；
Step 3, acquisition module after amplifying to EEG signals, being filtered by forming data information；
Data information is converted into instruction set and exported by step 4, the decoder module.
Step 2 divides multi-address coding in space division multiple access basis of coding edit code.
The hybrid coding for inducing stimulating module generation includes space division multiple access coding, CDMA coding, frequency division multiple access
Be mutually divided in multiple access at least arbitrary two kinds of coded combinations.
The space division multiple access (Fig. 1)：Using spatial information encode, up/down/left/right respectively represents four kinds of spatial informations, empty
Between position increase, the information of coding increases
The CDMA：Based on space division multiple access strategy, four kinds of information of up/down/left/right are subjected to digital coding, can be compiled
Code be " 0 " " 1 " " 2 " " 3 ", spatial information increase, coding can continue be incremented by (table 1 merely illustrates two kinds of spatial positional informations of left/right
Coding) frequency division multiple access：The different time once stimulated can induce different frequency, as the stimulation of single 100ms persistently lures
Send out the background brain wave frequency of 10Hz
The phase divides multiple access：The difference of stimulation initial time can change the phase of stimulation.
As shown in table 2, the hybrid coding for inducing stimulating module generation includes space division multiple access coding, CDMA volume
Code and mutually divides multiple access at frequency division multiple access.The hybrid coding combined strategy includes：It is " left/right " code that the space division multiple access, which is compiled,；It is described
CDMA is encoded to " 0/1 " CDMA dibit encoding；The frequency division multiple access is encoded to " 12Hz (single stimulation times
83.33ms's), 13 (single stimulation time 76.92ms'), 14 (single stimulation time 71.43ms'), 15 (single stimulate when
Between 66.67ms), 16 (single stimulation time 62.5ms') " five kinds of frequencies mutually divide multi-address coding " 0 °/90 ° " codings with described,
The hybrid coding strategy of 2x2x5x2=40 can be realized.
For inducing the asymmetric brain electrical feature of vision, Fig. 1 is that the brain-computer interface system structure of normal form of the present invention application is shown
It is intended to.The system includes eeg collection systems and the calculating such as liquid crystal display stimulation interface, electrode for encephalograms and eeg amplifier
The parts such as machine processing platform.System application normal form of the present invention carries out Induced by Stimulation, using the brain electricity of NeuroScan companies production
Digital acquisition system acquires EEG signals, and by signal, input computer carries out correlometer after eeg amplifier amplification, filtering
It calculates, BCI instructions is converted into after finally decoding EEG signals and are exported.Stimulation is presented and Data Management Analysis is based on
Matlab platforms are completed.
When using the system, user is sitting on the chair away from stimulation interface certain distance, and sight is watched attentively at stimulation interface
Center, as shown in "+" position in Fig. 2, in the stimulation meeting that different spatial (different locations such as upper and lower, left and right) occurs
Different brain electrical feature signals is induced, is encoded that form space division more using the spatial position characteristic of these brain electrical feature signals
Location coding strategy.By taking visual stimulus induces asymmetric VEP features as an example, stimulation occurs in the left and right visual field of user (as schemed
2) aVEP brain electrical feature signals, and in the correspondence spatial position of subject's brain are induced, that is, stimulate the meeting when left side occurs
More obvious VEP features are induced in the right side occipital region of brain, and on right side, appearance then can be in the left side occipital region of brain for stimulation
Induce more obvious VEP features.
The parameters such as shape, the area of stimulation can be adjusted according to different demands, be diameter 2mm's to be stimulated shown in Fig. 2
For white dot, it is encoded to 0 when stimulating the when of being generated in left visual field to define it, it is fixed when stimulation generates in the visual field of right side
It is encoded to 1 to justice, utilizes " 0/1 " binary coding thought, and CDMA is added in the variation sequence according to stimulation in different moments
Coding strategy, and then form empty, code hybrid coding strategy proposed by the present invention.For encoding 4 characters " AB ", " left/right "
Space division multiple access encodes, and " 0/1 " CDMA dibit encoding can be completed, as shown in table 1.
Table 1 is empty, code hybrid coding strategy is illustrated
The difference of stimulation time can change the frequency characteristic (i.e. frequency division multiple access encodes) of lasting Induced by Stimulation, such as single
The stimulation of 100ms persistently induces the background brain wave frequency of 10Hz, and the stimulation of single 50ms persistently induces the background brain electricity frequency of 20Hz
Rate, and stimulate the difference of initial time that can change the phases (i.e. phase divides multi-address coding) of stimulation, with two kinds of frequencies (10/20Hz),
It is as shown in table 2 to 8 character " A~H " coding signals for (0 °/90 °) codings of two kinds of phases, one volume of " 0/1 " CDMA
Code can be completed.
2 sky of table, frequency, mixes coding strategy signal at code
Comparison Tables 1 and 2 can be seen that addition frequency, after phase coding strategy can effective expansion instruction set, pass through and increase code point
The instruction set number of multi-address coding digit also scalable coding, and a stimulus duration and its duty ratio, stimulus sequence weight
Multiple round, often the parameters such as wheel train interval time are adjusted in combination with actual conditions.EEG signals to collecting again
It is decoded, to orient the character that user is watched attentively.By taking the stimulation normal form of 40 instruction set is realized in design as an example, by " left/
It is right " space division multiple access coding, " 0/1 " CDMA dibit encoding, " 12Hz (single stimulation time 83.33ms's), 13 (single thorns
Swash time 76.92ms), 14 (single stimulation time 71.43ms'), 15 (single stimulation time 66.67ms'), 16 (singles
Stimulation time 62.5ms's) " the frequency division multiple access codings of five kinds of frequencies.Table 2 lists, two kinds of spatial positions, double figures character code, and two
The signal of the coding of a frequency and two phases, 40 characters of codified in the way of this kind, if increasing spatial position, Huo Zhepin
Any one parameter such as rate or phase, can all increase the number for writing character
It should be understood that embodiment and example discussed herein simply to illustrate that, to those skilled in the art
For, it can be improved or converted, and all these modifications and variations should all belong to the protection of appended claims of the present invention
Range.
Claims (4)
1. a kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature, which is characterized in that including walking as follows
Suddenly：
Step 1, structure induces stimulating module in brain-computer interface system；
Step 2, the induction stimulating module send out hybrid coding signal to tester according to demand and form EEG signals；
Step 3, acquisition module after amplifying to EEG signals, being filtered by forming data information；
Data information is converted into instruction set and exported by step 4, the decoder module.
2. a kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature according to claim 1,
It is characterized in that, the hybrid coding for inducing stimulating module generation includes space division multiple access coding, CDMA coding, frequency division multiple access
Be mutually divided in multiple access at least arbitrary two kinds of coded combinations.
3. a kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature according to claim 2,
It is characterized in that, the hybrid coding for inducing stimulating module generation includes space division multiple access coding, CDMA coding, frequency division multiple access
With mutually divide multiple access.
4. a kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature according to claim 3,
It is characterized in that, the hybrid coding combined strategy includes：It is " left/right " code that the space division multiple access, which is compiled,；The CDMA coding
For " 0/1 " CDMA dibit encoding；The frequency division multiple access is encoded to " 12Hz, 13Hz, 14Hz, 15Hz, 16Hz " five kinds of frequencies
Mutually divide multi-address coding " 0 °/90 ° " codings with described, you can to realize the hybrid coding strategy of 2x2x5x2=40.
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| CN201810065388.1A CN108469896A (en) | 2018-01-23 | 2018-01-23 | A kind of brain-computer interface hybrid coding normal form method based on asymmetric brain electrical feature |
| PCT/CN2018/125927 WO2019144776A1 (en) | 2018-01-23 | 2018-12-30 | Coding-decoding method for brain-machine interface system based on asymmetric electroencephalographic features |
| US16/616,834 US11221672B2 (en) | 2018-01-23 | 2018-12-30 | Asymmetric EEG-based coding and decoding method for brain-computer interfaces |
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Cited By (5)
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| CN109567936A (en) * | 2018-11-16 | 2019-04-05 | 重庆大学 | A kind of brain machine interface system and implementation method paid attention to based on the sense of hearing with multifocal electro physiology |
| WO2019144776A1 (en) * | 2018-01-23 | 2019-08-01 | 天津大学 | Coding-decoding method for brain-machine interface system based on asymmetric electroencephalographic features |
| CN111580643A (en) * | 2020-04-10 | 2020-08-25 | 天津大学 | Brain-computer interface method based on steady-state asymmetric visual evoked potential |
| CN112882567A (en) * | 2021-01-26 | 2021-06-01 | 华为技术有限公司 | Man-machine interaction method, man-machine interaction device and storage medium |
| CN114167989A (en) * | 2021-12-09 | 2022-03-11 | 太原理工大学 | Brain-controlled spelling method and system based on visual and auditory inducement and stable decoding |
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| WO2019144776A1 (en) * | 2018-01-23 | 2019-08-01 | 天津大学 | Coding-decoding method for brain-machine interface system based on asymmetric electroencephalographic features |
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| CN114167989A (en) * | 2021-12-09 | 2022-03-11 | 太原理工大学 | Brain-controlled spelling method and system based on visual and auditory inducement and stable decoding |
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