Yang Shang-You, Lin Yuan-Pin
Annu Int Conf IEEE Eng Med Biol Soc. 2020 Jul;2020:4055-4058. doi: 10.1109/EMBC44109.2020.9176190.
Recent mobile and wearable electroencephalogram (EEG)-sensing technologies have been demonstrated to be effective for measuring rapid changes of spatio-spectral EEG correlates of brain and cognitive functions of interest with more ecologically natural settings. However, commercial EEG products are available commonly with a fixed headset in terms of the number of electrodes and their locations to the scalp practically constrains their generalizability for different demands of EEG and brain-computer interface (BCI) study. While most progress focused on innovation of sensing hardware and conductive electrodes, less effort has been done to renovate mechanical structures of an EEG headset. Recently, an electrode-holder assembly infrastructure was designed to be capable of unlimitedly (re)assembling a desired n-channel electrode headset through a set of primary elements (i.e., LEGO-like headset). The present work empirically demonstrated one of its advantage regarding coordinating the homogeneous or heterogeneous sensors covering the target regions of the brain. Towards this objective, an 8-channel LEGO headset was assembled to conduct a simultaneous event-related potential (ERP) recording of the wet- and dry-electrode EEG systems and testify their signal quality during standing still versus treadmill walking. The results showed that both systems returned a comparable P300 signal-to-noise ratio (SNR) for standing, yet the dry system was more susceptible to the movement artifacts during slow walking. The LEGO headset infrastructure facilitates a desired benchmark study, e.g., comparing the signal quality of different electrodes on non-stationary subjects conducted in this work, or a specific EEG and BCI application.
最近的移动和可穿戴脑电图（EEG）传感技术已被证明在更生态自然的环境中，对于测量与感兴趣的大脑和认知功能相关的时空频谱脑电图快速变化是有效的。然而，商业EEG产品通常配备固定的头戴设备，电极数量及其在头皮上的位置实际上限制了它们对EEG和脑机接口（BCI）研究不同需求的通用性。虽然大多数进展集中在传感硬件和导电电极的创新上，但在革新EEG头戴设备的机械结构方面所做的努力较少。最近，设计了一种电极支架组装基础设施，能够通过一组基本元件（即类似乐高的头戴设备）无限地（重新）组装所需的n通道电极头戴设备。目前的工作通过实验证明了其在协调覆盖大脑目标区域的同质或异质传感器方面的一个优势。为了实现这一目标，组装了一个8通道乐高头戴设备，用于对湿式和干式电极EEG系统进行同步事件相关电位（ERP）记录，并在静止和跑步机行走期间测试它们的信号质量。结果表明，两个系统在站立时返回的P300信噪比（SNR）相当，但干式系统在慢走期间更容易受到运动伪影的影响。乐高头戴设备基础设施有助于进行所需的基准研究，例如，比较本工作中在非静止受试者身上不同电极的信号质量，或特定的EEG和BCI应用。
