CN107463249A - Show the brain machine interface system and control method of VEP based on VR heads - Google Patents
Show the brain machine interface system and control method of VEP based on VR heads Download PDFInfo
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- CN107463249A CN107463249A CN201710513904.8A CN201710513904A CN107463249A CN 107463249 A CN107463249 A CN 107463249A CN 201710513904 A CN201710513904 A CN 201710513904A CN 107463249 A CN107463249 A CN 107463249A
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
- G06F3/015—Input arrangements based on nervous system activity detection, e.g. brain waves [EEG] detection, electromyograms [EMG] detection, electrodermal response detection
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Abstract
The invention discloses a kind of brain machine interface system and control method for showing VEP based on VR heads, the system includes visual stimulus module, brain wave acquisition module, brain electric treatment module, signal output module.Visual stimulus module provides the visual stimulus that can induce all VEPs of such as event related potential or Steady State Visual Evoked Potential；Evoked ptential caused by cerebral cortex under the collection visual stimulus of brain wave acquisition module；The processing such as brain electric treatment module is amplified to the brain electricity collected, filtered, noise reduction, obtain the EEG signals of better performances；Signal output module will it is treated after EEG signals by Bluetooth transmission to external device.The present invention uses virtual reality head-mounted display apparatus to provide visual stimulus to produce Evoked ptential, change the visual stimulus system for having to present in traditional brain machine interface system by non-portable device such as computer screens, make vision display device more light and handy and convenient, the volume of brain machine interface system is greatly reduced, improves flexibility and the practical value of brain machine interface system.
Description
Technical field
The invention belongs to biomedical engineering to interact with a computer technical field, and in particular to one kind shows vision based on VR heads
The brain machine interface system and control method of Evoked ptential.
Background technology
Brain-computer interface (Brain Computer Interface, BCI) is in human brain and computer or other electronic equipments
Between establish independent of conventional brain information output channel (peripheral nerve and musculature) it is brand-new externally information interchange and
Control technology.The initial purpose of research BCI systems is to provide a kind of and external world for the patient with nerve and motor system disease
The mode of exchange, patient can be allowed to control external equipment with the mental awareness of oneself, further improve the quality of the life of patient.With
The research to this technology progressively to deepen, brain-computer interface will have been given play to more in the various fields such as neuromedicine and artificial intelligence
Big application value.
Currently used BCI technologies are view-based access control model Evoked ptential (Visual Evoked Potential, VEP) BCI
Technology, it is primarily referred to as when carrying out certain visual stimulus to subject, the transmission of peripheral neverous system and central nervous system
In can be detected weak electrical potentials change.The BCI technologies of view-based access control model Evoked ptential use computer display conduct more
Stimulator, show stimulates block, it is necessary to using software programming, according to system time and renewal frequency, meter on a computer display
Calculate the shape of figure in video memory, brightness, in current moment etc..With increasingly widening for brain-computer interface technical research and application,
Its mobility to system proposes new requirement, and the brain machine interface system on desktop computer largely can not expire
The daily life requirement of foot, therefore portable brain machine interface system is urgently studied.
In recent years, with the maturation of virtual reality (Virtual Reality, VR) technology, by BCI technologies and VR technology phases
With reference to a kind of new brain-computer interface (BCI-VR) system based on virtual technology of composition.Worn using the aobvious i.e. virtual reality of VR heads
Formula display device produces more positive, more rich colorful, more incentive visual stimulus scene, can be substantially reduced existing
The volume of BCI systems, the portable of BCI systems is realized, greatly promote application of the BCI systems in clinical medicine and production, life.
Brain machine interface system and control method that VR heads show VEP are still not based at present.
The content of the invention
For it is involved in background technology the defects of, the present invention provide it is a kind of based on VR heads show VEP brain
Machine interface system and control method.
The present invention uses following technical scheme to solve above-mentioned technical problem：
A kind of brain machine interface system for showing VEP based on VR heads, including visual stimulus module, brain wave acquisition mould
Block, brain electric treatment module, signal output module；
The visual stimulus module is connected with subject head；Subject head is connected with brain wave acquisition module；
The brain wave acquisition module is connected with brain electric treatment module；
The brain electric treatment module is connected with signal output module；
The visual stimulus module can induce event related potential or Steady State Visual Evoked Potential etc. for offer to be owned
The visual stimulus of VEP；
The brain wave acquisition module is used to gather Evoked ptential caused by cerebral cortex under visual stimulus；
The processing such as the brain electric treatment module is used to being amplified the brain electricity that collects, filtered, noise reduction, obtain performance compared with
Good EEG signals；
The signal output module is used for the EEG signals after treating by Bluetooth transmission to external device；
As a kind of further preferred scheme for the brain machine interface system for showing VEP based on VR heads of the present invention, institute
State visual stimulus module and use virtual reality head-mounted display apparatus, construct visual stimulus circle in reality environment scene
Face, the visual stimulus normal form with setting rule or frequency is produced, to induce cerebral cortex potential change；
As a kind of further preferred scheme for the brain machine interface system for showing VEP based on VR heads of the present invention, institute
State brain wave acquisition module and include brain evoked potential detection Acquisition Circuit；Brain evoked potential detection Acquisition Circuit passes through the dry electrode of body surface
The Cortical Evoked Potentials under a certain visual stimulus normal form are extracted as sensor collection, the collection of scalp EEG signals uses
Unipolar lead mode；
As a kind of further preferred scheme for the brain machine interface system for showing VEP based on VR heads of the present invention, institute
State brain electric treatment module and include signal amplification filtering Dolby circuit；Signal amplification filtering Dolby circuit is adopted to brain evoked potential detection
The processing such as the EEG signals that collector extracts are amplified, filtered, noise reduction, to obtain, distortion rate is low, the obvious brain electricity of feature
Signal；
As a kind of further preferred scheme for the brain machine interface system for showing VEP based on VR heads of the present invention, institute
State signal output module and include Bluetooth transmission circuit；Bluetooth transmission circuit, which amplifies signal, filters the brain electricity that Dolby circuit has been handled
Signal is sent to external device.
A kind of brain machine interface system and control method for being shown VEP based on VR heads, is comprised the steps of：
Step 1), visual stimulus module produce a certain stimulation normal form, induce subject head cerebral cortex potential change；
Step 2), brain wave acquisition module extract the cerebral cortex under the visual stimulus normal form by the dry electrode collection of body surface and induce electricity
Position；
Step 3), brain electric treatment module collect brain evoked potential to brain wave acquisition module and are amplified, filter, noise reduction process；
The complete EEG signals of brain electric treatment resume module are converted into packet, are transferred to the external world by step 4), signal circuit
Equipment.
Beneficial effect of the present invention：
1st, apparatus of the present invention construct the vision in reality environment scene using the aobvious core as visual stimulus module of VR heads
Stimulate interface and produce related potential change to induce cerebral cortex；In brain wave acquisition module, gather this using the dry electrode of body surface and regard
Feel the VEP under stimulating, be then passed to brain electric treatment module；Brain electric treatment module is to original EEG signals
It is amplified, filters, the processing such as noise reduction；Signal transmission module using bluetooth communication by the EEG signals handled be sent to PC or
The external devices such as terminal；
2nd, the present invention combines virtual reality technology with brain-computer interface technology, changes necessary in traditional brain machine interface system
The visual stimulus system to be presented by non-portable device such as computer screens, make vision display device more light and handy and convenient, greatly
The big volume for reducing brain machine interface system, reduces electrode lead number, improves flexibility and the reality of brain machine interface system
With value, the application of brain machine interface system is expanded, to biomedicine, medical science of recovery therapy, neuromedicine and human-computer interaction intelligence
The development of energy system is significant.
Brief description of the drawings
Fig. 1 is the integrated stand composition of the present invention；
Fig. 2 is the process for using figure of the present invention；
(site shows vision induced to Tu3Shi Wei worlds 10-20 system neuroelectricitys record standard for one kind based on VR heads in ellipse
Site used in the brain machine interface system of current potential).
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of brain machine interface system for showing VEP based on VR heads, including visual stimulus module,
Brain wave acquisition module, brain electric treatment module, signal output module；The visual stimulus module is connected with subject head；Subject
Person head is connected with brain wave acquisition module；The brain wave acquisition module is connected with brain electric treatment module；The brain electric treatment module
It is connected with signal output module；
The visual stimulus module can induce event related potential or Steady State Visual Evoked Potential etc. for offer to be owned
The visual stimulus of VEP；
The brain wave acquisition module is used to gather Evoked ptential caused by cerebral cortex under visual stimulus；
The processing such as the brain electric treatment module is used to being amplified the brain electricity that collects, filtered, noise reduction, obtain performance compared with
Good EEG signals；
The signal output module is used for the EEG signals after treating by Bluetooth transmission to external device；
The visual stimulus module uses virtual reality head-mounted display apparatus, constructs regarding in reality environment scene
Feeling stimulates interface, the visual stimulus normal form with setting rule or frequency is produced, to induce cerebral cortex potential change；VR heads
It is aobvious that a variety of visual stimulus normal forms are provided, it can such as induce event related potential (Event-Related Potential, ERP)
Small probability event visual stimulus normal form, Steady State Visual Evoked Potential (Short-State Visual Evoked can be induced
Potential, SSVEP) fixed frequency visual stimulus normal form；
The brain wave acquisition module includes brain evoked potential detection Acquisition Circuit；Brain evoked potential detection Acquisition Circuit passes through
The dry electrode of body surface extracts the Cortical Evoked Potentials under a certain visual stimulus normal form as sensor collection；VEP
It is that cerebral cortex occipital lobe area is reacted the electricity occurred regarding stimulation, is to represent retina to receive stimulation, through being conducted depending on road to occipital lobe skin
Potential change caused by layer.According to nervous physiology theory, VEP (O at midline occipitalZ) response it is most strong,
So with OzSite is eeg signal acquisition passage；Ear-lobe compared to other brain electrode positional distance brains farther out, response amplitude compared with
It is low, so typically using the ear-lobe of any side in left and right as reference channel position；Center line volume (FZ) site is as Grounding；
The brain electric treatment module includes signal amplification filtering Dolby circuit；Signal amplification filtering Dolby circuit is induced brain
The EEG signals that potentiometric detection Acquisition Circuit is extracted are amplified, filtered, the processing such as noise reduction, and to obtain, distortion rate is low, feature
Obvious EEG signals；The amplitude of normal EEG signals be μ V levels, and scope is the μ V of 5 μ V~200, and frequency range is 5~35HZ, institute
To need to be amplified the original EEG signals collected, filter the processing such as high frequency, noise reduction；
The signal output module includes Bluetooth transmission circuit；Bluetooth transmission circuit uses frequency hopping, and signal is amplified
The EEG signals that filtering Dolby circuit has been handled are sent to external device after being converted into packet, and external device sets corresponding
Communications protocol, then it can receive EEG signals；
A kind of brain machine interface system and control method for being shown VEP based on VR heads, is comprised the steps of：
Step 1), visual stimulus module produce a certain stimulation normal form, induce subject head cerebral cortex potential change；
Step 2), brain wave acquisition module extract the cerebral cortex under the visual stimulus normal form by the dry electrode collection of body surface and induce electricity
Position；
Step 3), brain electric treatment module collect brain evoked potential to brain wave acquisition module and are amplified, filter, noise reduction process；
The complete EEG signals of brain electric treatment resume module are converted into packet, are transferred to the external world by step 4), signal transmission module
Equipment.
As shown in Fig. 2 it is a kind of brain machine interface system process for using for showing VEP based on VR heads.
It is brain wave acquisition site row general in the world as shown in figure 3, being international 10-20 systems neuroelectricity record standard
Butut, site is site used in brain machine interface system of the present invention to the site (OZ, FZ) used in the present invention i.e. in ellipse, this
Invention obtains preferable signal using less site, reflects the succinct of system.
Brain machine interface system provided by the invention, using virtual reality imagery technology, make one in a non-laboratory environment just
Some specific outside stimulus can be received so as to produce brain Electrical change, dry electrode is placed on the particular acquisition point on head i.e.
It can obtain the change of electric signal, then by the processing such as amplifying, filtering, useful EEG signals can be obtained.The technology can carry
Corticocerebral physiology potential change is got, the signal of acquisition is authentic and valid, and the equipment of use is seldom, and process is simple, to people
Class mood produces and the research of cognitive reaction is very helpful.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of brain machine interface system for showing VEP based on VR heads, it is characterised in that including visual stimulus module, brain
Electric acquisition module, brain electric treatment module, signal output module；
The visual stimulus module is connected with subject head；Subject head is connected with brain wave acquisition module；
The brain wave acquisition module is connected with brain electric treatment module；
The brain electric treatment module is connected with signal output module；
The visual stimulus module, which is used for offer, can induce all visions such as event related potential or Steady State Visual Evoked Potential
The visual stimulus of Evoked ptential；
The brain wave acquisition module is used to gather Evoked ptential caused by cerebral cortex under visual stimulus；
The processing such as the brain electric treatment module is used to being amplified the brain electricity that collects, filtered, noise reduction, obtain better performances
EEG signals；
The signal output module is used for the EEG signals after treating by Bluetooth transmission to external device.
A kind of 2. brain machine interface system for showing VEP based on VR heads according to claim 1, it is characterised in that
The visual stimulus module usesVirtual realityHead-mounted display apparatus, construct visual stimulus circle in reality environment scene
Face, the visual stimulus normal form with setting rule or frequency is produced, to induce cerebral cortex potential change.
A kind of 3. brain machine interface system for showing VEP based on VR heads according to claim 1, it is characterised in that
The brain wave acquisition module includes brain evoked potential detection Acquisition Circuit；
Brain evoked potential detects Acquisition Circuit is used as under a certain visual stimulus normal form of sensor collection extraction by the dry electrode of body surface
Cortical Evoked Potentials, the collection of scalp EEG signals uses unipolar lead mode.
A kind of 4. brain machine interface system for showing VEP based on VR heads according to claim 1, it is characterised in that
The brain electric treatment module includes signal amplification filtering Dolby circuit；
The EEG signals that signal amplification filtering Dolby circuit extracts to brain evoked potential detection Acquisition Circuit are amplified, filtered
The processing such as ripple, noise reduction, to obtain, distortion rate is low, the obvious EEG signals of feature.
A kind of 5. brain machine interface system for showing VEP based on VR heads according to claim 1, it is characterised in that
The signal output module includes Bluetooth transmission circuit；
The EEG signals that signal amplification filtering Dolby circuit has been handled are sent to external device by Bluetooth transmission circuit.
6. based on described in claim 1 it is a kind of based on VR heads show VEP brain machine interface system control method,
Characterized in that, comprise the steps of：
Step 1), visual stimulus module produce a certain stimulation normal form, induce subject head cerebral cortex potential change；
Step 2), brain wave acquisition module extract the cerebral cortex under the visual stimulus normal form by the dry electrode collection of body surface and induce electricity
Position；
Step 3), brain electric treatment module collect brain evoked potential to brain wave acquisition module and are amplified, filter, noise reduction process；
The complete EEG signals of brain electric treatment resume module are converted into packet, are transferred to the external world by step 4), signal circuit
Equipment.
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| CN110286757A (en) * | 2019-06-14 | 2019-09-27 | 长春理工大学 | A kind of wearable brain machine interface system and control method based on mixed reality |
| CN110547760A (en) * | 2019-08-09 | 2019-12-10 | 西安交通大学 | infant amblyopia electroencephalogram objective detector |
| CN111240462A (en) * | 2018-11-29 | 2020-06-05 | 天津职业技术师范大学 | Brain-computer interface platform based on mixed reality and control method thereof |
| CN111528834A (en) * | 2020-03-25 | 2020-08-14 | 西安电子科技大学 | Real-time SAR image target detection system and method |
| CN111580645A (en) * | 2020-04-21 | 2020-08-25 | 天津大学 | Peripheral visual field calibration stimulation-induced electroencephalogram decoding-based sight tracking method |
| CN111671418A (en) * | 2020-06-11 | 2020-09-18 | 深圳大学 | Event-related potential acquisition method and system considering brain working state |
| CN113576497A (en) * | 2021-08-30 | 2021-11-02 | 清华大学深圳国际研究生院 | Visual steady-state evoked potential detection system oriented to binocular competition |
| CN113648541A (en) * | 2021-08-13 | 2021-11-16 | 上海大学 | Magnetic stimulation and brain signal acquisition combined synchronous integrated device |
| CN114489335A (en) * | 2022-01-21 | 2022-05-13 | 上海前瞻创新研究院有限公司 | Method, device, storage medium and system for detecting brain-computer interface |
| CN116458850A (en) * | 2023-05-06 | 2023-07-21 | 江西恒必达实业有限公司 | VR brain electricity collection system and brain electricity monitoring system |
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| CN111240462A (en) * | 2018-11-29 | 2020-06-05 | 天津职业技术师范大学 | Brain-computer interface platform based on mixed reality and control method thereof |
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| CN116458850B (en) * | 2023-05-06 | 2023-11-03 | 江西恒必达实业有限公司 | VR brain electricity collection system and brain electricity monitoring system |
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Application publication date: 20171212 |