Research On Features Of Motor Induced EEG And Design Of Feedback System For Stroke Rehabilitation

Stroke is a syndrome of local dysfunction caused by sudden vascular lesion in brain region.And it is also the first kind of disabling disease for nervous system in the world.Patients will suffer from different degrees of dyspnea in post-stroke,which can seriously affect normal life.Therefore,effective rehabilitation auxiliary measures are urgently needed.The system of motor feedback rehabilitation training based on Braincomputer interface(BCI)can realize the synchronous coupling of limb movement and cortical activity,which can promote the reconstruction of motor function,has attracted more and more attention.However,the rehabilitation mechanism of the system is not clear and the design lacks guidance,which affects the application.Therefore,directing at the aspect of induction and feedback in the system of motor feedback rehabilitation training,this paper focuses on exploring the mechanism of EEG response related to motor induction,so as to optimize the design of the feedback training system.For the link of motor induction,the subjects were divided into groups according to the comparing results of the activation intensity in sensorimotor cortex induced by motor imagery(MI)and action observation(AO).Then,exploring the EEG the cortex response under the same evoked paradigm between the groups and different evoked paradigms within the groups.The results of EEG analysis showed that there were significant differences in the activation of sensorimotor cortex and the functional connectivity characteristics of brain network between the two groups under the experimental conditions with MI participation.Specifically,for the group with weak MI EEG characteristics,the subjects got the highest activation level of the sensorimotor cortex under the AO condition,while for the group with strong MI EEG characteristics,the subjects got the highest activation level of the sensorimotor cortex under the MI+AO condition.For the link of feedback,the activation response of sensorimotor cortex under different limb movement rate(1/3Hz,2/3Hz and 1Hz),induced by visual prompt and functional electrical stimulation(FES),was investigated.The results showed that the activation level of the sensorimotor cortex was stronger under the condition of 2/3Hz frequency.Based on the above results,a motor feedback rehabilitation training system based on BCI was finally built,and the experiments of online training was conducted for three typical subjects with weak MI EEG characteristics.After training,the level of sensorimotor cortex activation induced by MI(especially the EEG characteristic energy with high alpha frequency)was significantly enhanced,which preliminarily verified the effective of system application.In this paper,a series of studies were carried out on the induction and feedback links of the motor feedback rehabilitation training system,and finally a motor feedback rehabilitation training system based on BCI technology was built,which provide theoretical basis and method support for optimizing the mode of rehabilitation training,shortening the rehabilitation process and obtaining better therapeutic effects.