Hu Yuxia, Zhang Lipeng, Chen Mingming, Li Xiaoyuan, Shi Li
Henan Key Laboratory of Brain Science and Brain-Computer Interface Technology, Department of Automation, School of Electric Engineering, Zhengzhou University, Zhengzhou, China.
Department of Automation, Tsinghua University, Beijing, China.
Front Neurosci. 2017 Dec 11;11:683. doi: 10.3389/fnins.2017.00683. eCollection 2017.
Readiness potential (RP) based on electroencephalograms (EEG) has been studied extensively in recent years, but no studies have investigated the influence of the reference electrode on RP. In order to investigate the reference effect, 10 subjects were recruited and the original vertex reference (Cz) was used to record the raw EEG signal when the subjects performed a motor preparation task. The EEG was then transformed to the common average reference (CAR) and reference electrode standardization technique (REST) reference, and we analyzed the RP waveform and voltage topographies and calculated the classification accuracy of idle and RP EEG segments. Our results showed that the RP waveform and voltage topographies were greatly influenced by the reference, but the classification accuracy was less affected if proper channels were selected as features. Since the Cz channel is near the primary motor cortex, where the source of RP is located, using the REST and CAR references is recommended to get accurate RP waveforms and voltage topographies.
近年来，基于脑电图（EEG）的准备电位（RP）得到了广泛研究，但尚无研究探讨参考电极对RP的影响。为了研究参考效应，招募了10名受试者，在他们执行运动准备任务时，使用原始头顶参考电极（Cz）记录原始EEG信号。然后将EEG转换为公共平均参考（CAR）和参考电极标准化技术（REST）参考，我们分析了RP波形和电压地形图，并计算了静息和RP EEG段的分类准确率。我们的结果表明，参考电极对RP波形和电压地形图有很大影响，但如果选择合适的通道作为特征，分类准确率受影响较小。由于Cz通道靠近RP的起源地即初级运动皮层，因此建议使用REST和CAR参考来获得准确的RP波形和电压地形图。
