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研究证实,运动观察与运动想象对大脑的激活有利于中风后的运动功能再学习,可用于探索人类行为过程中大脑的神经机制.为对比分析运动观察和运动想象时皮层神经元的活动特征,选取10名健康被试,采集每名被试在运动观察和运动想象时特定手部抓握动作模式下的脑电信号(EEG);引入Gabor滤波器对感觉运动区和视觉区的EEG进行时频能量谱估计,并在此基础上对EEG进行事件相关去同步/同步化(ERD/ERS)分析;最后建立ERDI(ERD index)指标对左手和右手进行模式分类并量化比较运动观察与运动想象.研究结果表明,运动观察与运动想象类似,均激活大脑感觉运动皮层,并且运动想象产生对侧主导的α和βERD;基于ERDI指标的运动想象左右手识别正确率高于运动观察分类正确率;此外,运动观察过程还同时伴随视觉皮层活动,使β节律能量产生显著衰减.本研究为运动观察和运动想象在临床康复训练以及脑机接口领域的应用提供了神经生理基础和实现途径.
The research confirms that the observation of motor and the imagination of the brain activate the motor function is conducive to re-learning motor function after stroke, which can be used to explore the neural mechanism of human behavior in the process of brain movement.In order to compare and analyze the motor cortex neuronal activity characteristics, Ten healthy subjects were selected to collect the EEG of each participant in the specific hand-grip mode of motion observation and motion imaging. The Gabor filter was used to detect the EEG of sensory and visual areas Frequency energy spectrum estimation and event-related desynchronization / synchronization (ERD / ERS) analysis of EEG. Finally, ERDI (ERD index) index was established to classify the left and right hands and quantify the comparison of motion observation and motor imaging The results show that both exercise and motor imagings are similar and both activate the sensory motor cortex in the brain, and the motor imagings produce contralateral dominant α and β ERDs. The ERDI-based motion imaging right-handed and left-hand recognition rates are higher than those of the motion observation and classification. In addition , The process of observation also accompanied by visual cortex activity, so that the rhythm of energy produced a significant decline in this study for the observation and movement of motor sports in the The clinical rehabilitation training and the application in the field of brain-computer interface provided the neurophysiological basis and the way to realize it.