Research On Extremity Motor Function Reconstruction By BCI-FES

Coming with the aggravated ageing problem, the morbidity of stroke is rising sharply. New effective rehabilitation methods for cerebrovascular accident are demanded as the increasing number of stroke patients. The functional electrical stimulation(FES) therapy is widely used in recovery of stroke compared with passive mechanical assistant devices. The FES therapy cannot be obtained large-scale application and promotion since it is still a passive therapy without autonomous-control.Combining Brain-Computer-Interface(BCI) with FES will reconstruct the spinal function of stroke patients externally. While the BCI-FES therapy may become a new rehabilitation method which can improve participation of rehabilitation training. The thesis finish a complete BCI-FES combining the clinical demands. The FES device line with standards of neuromuscular electrical stimulator YY0607-2007. The FES device is motivated by BCI instructions which have been specially optimized for a low false positive rate. A common spatial pattern is used in motor imagery feature extraction and support vector machine is applied in the pattern recognition of two modes(resting and imagery).Two healthy volunteers and two stoke patients participated in the BCI experiment and the two patients also took part in the BCI-FES rehabilitation training. The clinical scales, BEAM and laterality coefficient were used as measurements on the evaluation of a stroke patient's recovery: there were significant improvements in score of the clinical scales; a good ipsilateral dominant phenomenon of the stoke patient faded away with the implement of rehabilitation process. It turned into contralateral dominant, which is higher degree of activation in the contralateral brain regions. As the patient's periodic healing, function of the contralateral brain regions to the dysfunctional limbs recovered increasingly. The compensation function of the ipsilateral brain regions to the paralyzed body weakened gradually at the same time. It indicates superiority the of BCI-FES system in stroke rehabilitation.