基于相关指数分析增强的功能近红外光谱脑机接口

发布时间：2018-01-15 06:32

本文关键词：基于相关指数分析增强的功能近红外光谱脑机接口　出处：《科技导报》2017年02期 　论文类型：期刊论文

【摘要】：由于对运动伪迹不敏感、适合特殊人群和可穿戴式检测等优势,功能近红外光谱技术(fNIRS)在脑机接口(BCI)、心理认知等领域发挥着日益重要的作用。肢体运动想象是BCI在残疾人康复训练等领域应用的重要范式,伴随穿戴式fNIRS的发展,有望帮助残疾人在家庭或社区开展长期脑康复训练。本文针对目前基于fNIRS的运动想象任务分类准确率普遍不高这一现状,应用基于Pearson积差相关系数的相关指数R~2,对被试进行个性化参数优化,期望改善运动想象的分类结果。实验采集了17名被试的左、右手运动想象任务期间大脑皮层主运动区的血红蛋白浓度变化数据,并采用支持向量机(SVM)分类。结果表明,经过R~2参数优化之后,分类准确率相对无优化情况显著提升,分类准确率在60%以上的被试比例由原本的58.8%提高到了94%,分类准确率在65%以上的被试比例由原本的41.2%提升到了64.7%。
[Abstract]:Because it is insensitive to motion artifacts and suitable for special population and wearable detection, FNIRS (functional near Infrared Spectroscopy) is used in BCI (Brain-Computer Interface). Mental cognition and other fields play an increasingly important role. Limb movement imagination is an important paradigm used in rehabilitation training of disabled people, along with the development of wearable fNIRS. It is expected to help the disabled to carry out long-term brain rehabilitation training in their families or communities. This paper aims at the current situation that the classification accuracy of motion imagination tasks based on fNIRS is generally not high. The correlation index based on the correlation coefficient of Pearson product difference was used to optimize the personalized parameters of the subjects in order to improve the classification results of motion imagination. The left of 17 subjects were collected in the experiment. The changes of hemoglobin concentration in the main motor area of cerebral cortex during the right hand motion imagination task were classified by support vector machine (SVM). The results showed that the R2 parameters were optimized. The accuracy of classification was not improved significantly, and the proportion of subjects whose classification accuracy was more than 60% was increased from 58.8% to 94%. The percentage of subjects whose classification accuracy was above 65% was raised from 41.2% to 64.7.
【作者单位】：北京航空航天大学生物与医学工程学院;虚拟现实技术与系统国家重点实验室(北京航空航天大学);
【基金】：国家自然科学基金项目(61101008,61108084,61675013)
【分类号】：TN21;TN911.7;R318
【正文快照】： 功能近红外光谱技术(functional near-infrared spectroscopy,f NIRS)是新一代的脑功能成像技术。该方法基于神经血管耦合机制(即神经元的代谢活性和血管中氧合血红蛋白含量的关系),得益于生物组织对近红外波段光较低的吸收率,利用血红蛋白组分对近红外光的吸收差异,可以有效

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