Abstract
To explore the effects of hand motion imagery on brain plasticity for use in guiding disabled people to use robotic arms, this paper designed a comparison experiment between the disabled and normal people, and collected the EEG data of 4 subjects (2 disabled men who lost their right hands and 2 normal men) for five weeks of training. What’s more, this paper compared and analyzed the collected EEG rhythm through the brain topographic map. The results showed that after training, the disabled people could produce ERD in both the μ and β frequency bands, and the longer the training time, the more obvious the ERD phenomenon was. This paper also uses the common space pattern algorithm and support vector machine to extract and classify the features of EEG signals. The results show that the classification accuracy of the disabled can reach more than 85%, and that of the normal can reach more than 90%. Based on the results of brain topographical map and classification, this paper concludes that motor imagination training can have a positive effect on the brain of people with impaired motor area, which provides a neurophysiological basis for the extensive application of motor imagination training in the field of rehabilitation.
Highlights
To explore the effects of hand motion imagery on brain plasticity for use in guiding disabled people to use robotic arms, this paper designed a comparison experiment between the disabled and normal people, and collected the EEG data of 4 subjects (2 disabled men who lost their right hands and 2 normal men) for five weeks of training
The results showed that after training, the disabled people could produce ERD in both the μ and β frequency bands, and the longer the training time, the more obvious the ERD phenomenon was
The results show that the classification accuracy of the disabled can reach more than 85%, and that of the normal can reach more than 90%
Summary
To explore the effects of hand motion imagery on brain plasticity for use in guiding disabled people to use robotic arms, this paper designed a comparison experiment between the disabled and normal people, and collected the EEG data of 4 subjects (2 disabled men who lost their right hands and 2 normal men) for five weeks of training. 摘要:探索手部运动想象对大脑可塑性的影响以便用于指导残疾人使用机械手臂,本文设计残疾人和正常人的比较实 验,采集了4名被试(2名失去右手的残疾男性,2名正常的男性)训练五周的脑电数据,并通过脑地形图对采集的脑电 信号 (EEG)节律进行对比分析。结果表明,经过训练,残疾人在μ和β频段均能产生ERD现象,并且一段时间内,训练 时间越长,ERD现象越明显。本文还利用共同空间模式算法和支持向量机对脑电信号进行特征提取及分类,残疾人分 类正确率可以达到85%以上,正常人可以达到90%以上。综合脑地形图和分类结果,本文得出了运动想象训练可以对 大脑运动区受损的人的大脑产生积极影响,这为运动想象训练在康复领域中的广泛应用提供神经生理依据。 神经的可塑性和大脑功能重组是神经损伤后功能恢 复的基础,是近20年来神经生物学研究发展的重要领域。 神经可塑性描述了人类中枢神经系统的内在性质,从结 构和功能上解释了人类如何适应变化获得新的技能[1]。 大脑发育成熟后依然保持着一定的可塑性,可以通过学 设置,参考电极(Ref)位于大脑中央区(CPz),接地电极 (GND)位于前额(AFz),位置如图 1所示,所有电极 的阻抗都调至 20 kΩ 以 下 。 该设备可以连接 Eprime 和 Phytoolbox等心理学分析软件,本文采用后者设计实验流 程。数据采集过程中,我们将采集系统的参数做如下设置: 采样率为1000Hz,滤波范围为2-100Hz。
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