Effects of Trial-Adjusted Neurofeedback Training on Motor-Imagery Based Brain-Computer Interface Performance

Akima Connelly, Pengcheng Li, Phurin Rangpong, Theerawit Wilaiprasitporn, T. Yagi
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Abstract

Motor imagery (MI) classification based on electroencephalography (EEG) has been extensively studied and recently used more in brain-computer interfaces (BCI). This study uses left and right hand MI tasks for the BCI system. A common obstacle for MI-BCI is the inability of some participants to perform the BCI task, called BCI illiteracy. Various training protocols have been investigated to improve the performance of BCI but are designed with a balanced dataset. Similarly to how people show a bias towards a side (e.g. left or right) for motor execution tasks, it has been seen that participants also show a performance bias in MI tasks as well. To address this MI bias in participants, a novel neurofeedback protocol was designed to adjust the number of trials each condition has. Trials will be adjusted to increase the number of times participants have to perform their weak MI task. This study aims to investigate the overall effect that the trial-adjusted neurofeedback had on participant’s cognitive performance on the MI-BCI system. The effects were investigated through time-frequency and band power analysis. The time-frequency analysis showed improvement in key MI feature and band power analysis results had an improvement on the alpha and beta frequency bands. In the analysis results, trial-adjusted neurofeedback was seen to have an effect on participant’s cognitive performance on the MI-BCI task.
试验调整神经反馈训练对基于运动图像的脑机接口性能的影响
基于脑电图(EEG)的运动意象(MI)分类得到了广泛的研究,近年来在脑机接口(BCI)中得到了更多的应用。本研究在脑机接口系统中使用了左手和右手MI任务。MI-BCI的一个常见障碍是一些参与者无法执行BCI任务,称为BCI文盲。为了提高BCI的性能,已经研究了各种各样的训练协议,但都是用平衡的数据集设计的。与人们在运动执行任务中倾向于一侧(例如左或右)的表现类似,我们已经看到参与者在MI任务中也表现出了表现偏见。为了解决参与者的这种心肌梗死偏差,设计了一种新的神经反馈方案来调整每种情况的试验次数。试验将进行调整,以增加参与者执行弱MI任务的次数。本研究旨在探讨经试验调整的神经反馈对被试在MI-BCI系统上的认知表现的整体影响。通过时频和频带功率分析研究了这些影响。时频分析结果显示关键MI特征有所改善,波段功率分析结果显示α和β频段有所改善。在分析结果中,经试验调整的神经反馈对参与者在MI-BCI任务中的认知表现有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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