The electroencephalogram (EEG) induced by steady-state visual evoked potential (SSVEP) will contain background noise. Most existing research on this problem uses signal-processing methods to enhance the EEG. The purpose of this paper is to explore another method that can be used to enhance the EEG. We creatively combined motion stimuli with light-flashing stimuli and designed a paradigm in which motion and light-flashing simultaneously will stimulate with the same frequency; this is called multi-source co-frequency stimulus. To avoid the direct stimulus of light-flashing in the human eye and ensure that the composite paradigm provided adequate comfort, the light-flashing pattern was presented in a ring form and the motion stimulus was presented in the center of that ring. Our hypothesis is that when the motion and the light-flashing are simultaneously stimulated with the same frequency, the EEG they induce will be superimposed in some way, and this will enhance the EEG. The multi-source co-frequency stimulus was found to achieve a higher signal-to-noise ratio (SNR), better accuracy, and a higher information transmission rate (ITR) than single stimulus. The experimental results showed that it is feasible to use the method proposed in this study to enhance the EEG.

中文翻译：

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一种用于脑电图（EEG）增强的多源同频刺激方法。

稳态视觉诱发电位（SSVEP）诱发的脑电图（EEG）将包含背景噪声。关于此问题的大多数现有研究都使用信号处理方法来增强脑电图。本文的目的是探索可用于增强脑电图的另一种方法。我们创造性地将运动刺激与闪光刺激结合在一起，并设计了一个范式，其中运动和闪光同时以相同的频率刺激。这就是所谓的多源同频激励。为避免人眼直接刺激闪光并确保复合范例提供足够的舒适感，将闪光模式呈环形呈现，并将运动刺激呈现在该环的中心。我们的假设是，当以相同的频率同时刺激运动和闪光时，它们诱发的脑电图将以某种方式叠加，这将增强脑电图。发现多源同频刺激比单刺激具有更高的信噪比（SNR），更好的精度和更高的信息传输速率（ITR）。实验结果表明，采用本研究提出的方法增强脑电图是可行的。