Uncovering Low-Dimensional Manifolds of Neural Dynamics for Motor-Imagery Based Stroke Rehabilitation: An EEG-Based Brain–Computer Interface Study

IF 5.2 2区 医学 Q2 ENGINEERING, BIOMEDICAL
Tao Liu;Ziwei Wang;Sadia Shakil;Raymond Kai-Yu Tong
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引用次数: 0

Abstract

Stroke rehabilitation aims to repair neural circuits and dynamics through the remapping of neuronal functions. However, there is currently a gap in understanding the alteration of neural population dynamics-the fundamental computational unit driving functions-under clinical settings. In this study, we introduced a novel method to identify stable low-dimensional structures of neural population dynamics in stroke patients during motor tasks. Using whole-brain EEG recordings from chronic stroke patients performing motor imagery (MI) tasks before and after brain-computer interface (BCI) training, as well as a public EEG dataset of acute stroke patients performing MI tasks, we projected EEG signals from sensor space to voxel space via source localization (eLORETA), simulating neural population activity in regions of interest. By applying dimensionality reduction, we successfully obtained low-dimensional neural manifolds to represent neural population dynamics. Our analysis revealed three key findings: (1) For right-handed patients, task-related low-dimensional dynamics in the related brain regions remain stable across subjects, with their features holding potential as biomarkers for stroke rehabilitation; (2) BCI training promotes global and sustained restoration of neural population dynamics; (3) EEG theta-band oscillations show strong correlation with these dynamics, highlighting their macroscopic nature. This study proposes a new, simple, and powerful tool for comprehension and validation of stroke rehabilitation mechanisms confirming the effectiveness of BCI training in restoring neural dynamics.
基于运动图像的脑卒中康复神经动力学低维流形的揭示:基于脑电图的脑机接口研究
中风康复的目的是通过神经元功能的重新映射来修复神经回路和动力学。然而,目前对临床环境下神经种群动态变化(基本计算单元驱动功能)的理解存在差距。在这项研究中,我们介绍了一种新的方法来识别脑卒中患者在运动任务时神经种群动态的稳定低维结构。利用脑机接口(BCI)训练前后慢性中风患者执行运动图像(MI)任务的全脑EEG记录,以及急性中风患者执行MI任务的公开EEG数据集,我们通过源定位(eLORETA)将EEG信号从传感器空间投影到体素空间,模拟感兴趣区域的神经群体活动。通过降维,我们成功地获得了低维神经流形来表示神经种群动态。结果表明:(1)在右撇子患者中,相关脑区任务相关的低维动态在受试者中保持稳定,其特征具有作为脑卒中康复生物标志物的潜力;(2)脑机接口训练促进神经种群动态的全局和持续恢复;(3)脑电图θ波段振荡与这些动态具有较强的相关性,突出了它们的宏观性质。本研究提出了一种新的、简单的、强大的工具来理解和验证脑卒中康复机制,确认脑机接口训练在恢复神经动力学方面的有效性。
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来源期刊
CiteScore
8.60
自引率
8.20%
发文量
479
审稿时长
6-12 weeks
期刊介绍: Rehabilitative and neural aspects of biomedical engineering, including functional electrical stimulation, acoustic dynamics, human performance measurement and analysis, nerve stimulation, electromyography, motor control and stimulation; and hardware and software applications for rehabilitation engineering and assistive devices.
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