Two-dimensional cursor motion control system and method based on motor imagery and steady-state visual evoked potential

Abstract

The invention discloses a two-dimensional cursor motion control system and method based on motor imagery and steady-state visual evoked potential. The system comprises an electrode cap, an electroencephalogram 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 executes motor imagery and visual attention tasks simultaneously according to a working interface instruction; the electrode cap acquires an electroencephalogram signal; the electroencephalogram acquisition instrument performs amplifying, filtering and analog-digital conversion on the electroencephalogram signal; the system control unit separates electroencephalogram data generated by motor imagery and visual attention and saving; the data processing module performs preprocessing, feature extraction and classification and identification on two kinds of electroencephalogram data in sequence; the cursor control module controls a cursor to perform continuous two-dimensional motion according to a classification and identification result. The system has the advantage of high control accuracy, high robustness, capability of realizing two-dimensional cursor continuous motion and the like, and can be used for performing motion control on a computer mouse.

Description

technical field [0001] The invention relates to brain-computer interface technology and computer technology. technical background [0002] 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. [0003] Brain-Computer Interface (BCI) monitors the user's brain activity, interprets the user's intentions, and converts the user's intentions into external commands. As a new, non-muscular communication channel, BCI enables people to express thoughts o...

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 a non-smooth Z-shaped cursor movement; the hybrid BCI based on motor imagery and P300 evoked potential is affected by the low accuracy of P300 potential detection and the long detection time, and the precision of two-dimensional cursor motion control is low. slower

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