Two-dimensional cursor movement control system and method based on motor imagery and coded modulation visual evoked potential

Abstract

The invention discloses a two-dimensional cursor movement control system and method based on motor imagery and coded modulation visual evoked potential. The system comprises an electrode cap, an electroencephalography acquisition instrument, a system control unit, a data processing module, a cursor control module and a visual stimulator, wherein the visual stimulator is provided for a user in an interface display way. The method comprises the following steps that: the user simultaneously executes a motor imagery task and a visual attention task according to a work interface instruction; the electrode cap collects an electroencephalography signal; the electroencephalography acquisition instrument carries out amplification, filtering and analog-digital conversion on the electroencephalography signal; the system control unit separates the electroencephalography data generated by the motor imagery and the visual attention, and then, the electroencephalography data is stored; the data processing module carries out preprocessing, feature extraction and classification identification on two classes of electroencephalography data in sequence; and the cursor control module controls a cursor to carry out continuous two-dimensional movement according to classification identification. The system has the advantages of being high in control accuracy, good in robustness and the like, the continuous movement of a two-dimensional cursor can be realized, and the system can be used for the movement control of a computer mouse.

Description

technical field [0001] The invention relates to brain-computer interface technology and computer technology. [0002] technical background [0003] A computer is a very popular device, and using a computer is a modern way of working, living and playing. However, existing computers are all designed for people with normal upper limbs and need healthy fingers to operate the mouse and keyboard. Amyotrophic lateral sclerosis, brainstem stroke, cerebral palsy, spinal cord injury, Parkinson's and other neurological diseases damage the central nervous system of the patient's brain and cause motor dysfunction in the limbs. These patients cannot use computers like normal people, which brings great inconvenience and distress to their lives. [0004] Brain-Computer Interface (BCI) monitors the user's brain activity, interprets the user's intention, and converts the user's intention into an external command. As a new, non-muscular communication channel, BCI enables people to express th...

AI Technical Summary

Problems solved by technology

However, for single-mode BCIs based on multi-type motor imagery, it is difficult for users to control two-dimensional cursor movement and requires long-term training; hybrid BCIs based on SSVEP and P300 potentials provide two binary output variables and can only achieve two-dimensional The discrete control of the cursor results in non-smooth Z-shaped cursor movement; the mixed BCI based on motor imagery and P300 evoked potential is affected by the long detection time of P300 potential, and the speed of two-dimensional cursor movement control is slow

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