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Brain-controlled input method based on steady state visual evoked potential and motor imagination

A steady-state visual eliciting and motor imagery technology, applied in the field of brain-computer interface, can solve the problems of singleness and limitation of function realization

Inactive Publication Date: 2019-03-15
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the singleness and limitations of the existing control methods, and provide a brain-controlled input method based on steady-state visual evoked potentials and motor imagery

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  • Brain-controlled input method based on steady state visual evoked potential and motor imagination
  • Brain-controlled input method based on steady state visual evoked potential and motor imagination
  • Brain-controlled input method based on steady state visual evoked potential and motor imagination

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Embodiment approach

[0101] (1) After the task is started, the user is facing the visually evoked input interface, wears the EEG electrode cap, and the virtual keys on the interface flash at different frequencies to stimulate the human brain to generate SSVEP potential;

[0102] (2) The user performs motor imagery of the left and right hands at the same time, and the EEG electrode cap starts to collect SSVEP and motor imagery EEG signals;

[0103] (3) After the signal is preprocessed (amplification, filtering, A / D conversion, etc.), the processed signal is transmitted to the digital signal processor through Bluetooth;

[0104] (4) The feature extraction algorithm and classification algorithm in the digital signal processor realize the feature extraction and pattern recognition tasks of SSVEP and motor imagery EEG signals, and transmit the control results to the virtual serial port of the PC through Bluetooth in real time to realize human-computer interaction Interface control, so as to realize fun...

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Abstract

The invention discloses a brain-controlled input method based on steady-state visual evoked potential and motor imagination. In order to overcome the problem of singleness and limitation of the function realization of the existing control method, the method comprises the following steps: 1) collecting EEG signals; (1) generating EEG signals; (2) EEG signal acquisition; 2) on-line EEG signal processing; 3) control that virtual keyboard to realize the intelligent typing function: the virtual keyboard interface is divide into: (1) a display interface: a. A character display area, wherein the character display area is used for displaying the input character; (b) vocabulary association area: that vocabulary association area can be use for users to quickly select character-related vocabulary andcan be selected whether to open or not; (2) Visual evoked input interface: All the 13 flashing keys in the visual evoked input interface can stimulate human brain to produce SSVEP potential. The movement of virtual keys is controlled by left and right hand movement imagination, and the selection of virtual keys is controlled by stimulating cerebral cortex to produce SSVEP signal by fixing virtualkeys.

Description

technical field [0001] The invention relates to an input method in the field of brain-computer interface, more precisely, the invention relates to a brain-controlled input method based on steady-state visual evoked potential and motor imagery. Background technique [0002] Brain-computer interface (BCI) is a human-computer interface developed in recent years. It is a system that can realize direct communication between the human brain and the outside world without relying on the normal output pathway of the brain. Different EEG signals, after effective signal processing and pattern recognition, the computer can recognize the user's thinking state and complete the desired control behavior. At present, BCI technology has been applied in the fields of medical rehabilitation engineering and robot-assisted control, and is receiving widespread attention from all over the world. It has high social value and research potential. [0003] In the field of BCI, commonly used control mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/01G06K9/00
CPCG06F3/015G06F2218/12
Inventor 陈万忠王晓旭李明阳李昕迪马春晖
Owner JILIN UNIV
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