High and dry? Comparing active dry EEG electrodes to active and passive wet electrodes
High and dry? Comparing active dry EEG electrodes to active and passive wet electrodes
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DOI：
10.1111/psyp.12536
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发表时间：
2017-01-01
期刊：
影响因子：
3.7
通讯作者：
Kizuk, Sayeed A. D.
中科院分区：
文献类型：
--
作者：
Mathewson, Kyle E.;Harrison, Tyler J. L.;Kizuk, Sayeed A. D.
干电极在实验室和消费者层面的电生理记录技术中正变得越来越受欢迎，因为它们更有能力将传统的基于实验室的研究转移到现实世界中。然而，目前尚不清楚干式电极与传统电极在数据质量方面的比较。目前的研究比较了三种脑电电极类型：(A)没有机载放大的被动-湿式电极，(B)有源放大的中等阻抗水平的湿式电极，以及(C)阻抗非常高的有源-干式电极。参与者完成了一项经典的P3听觉古怪任务，以获得特征性的脑电信号和事件相关电位(ERPs)。在三种电极类型上，我们比较了单次试验噪声、平均事件相关电位、头皮地形图、事件相关电位噪声和事件相关电位统计功率作为试验次数的函数。我们扩展了过去的工作，表明与同一放大器中的无源电极相比，有源电极的不敏感度达到中等水平的极间阻抗。重要的是，新的干式电极系统可以可靠地测量脑电频谱和ERP成分，可与传统电极类型相媲美。然而，正如预期的那样，具有非常高的极间阻抗的干活性电极在单次试验和平均噪声水平上显著增加，这降低了统计功率，需要更多的试验来检测显著的影响。这种功率的降低必须被认为是与易用性和长期使用之间的权衡。目前的结果有助于限制使用新型干电极的实验设计，并提供在新环境和情况下测量大脑活动所需的重要证据。
Dry electrodes are becoming popular for both lab-based and consumer-level electrophysiological-recording technologies because they better afford the ability to move traditional lab-based research into the real world. It is unclear, however, how dry electrodes compare in data quality to traditional electrodes. The current study compared three EEG electrode types: (a) passive-wet electrodes with no onboard amplification, (b) actively amplified, wet electrodes with moderate impedance levels, and low impedance levels, and (c) active-dry electrodes with very high impedance. Participants completed a classic P3 auditory oddball task to elicit characteristic EEG signatures and event-related potentials (ERPs). Across the three electrode types, we compared single-trial noise, average ERPs, scalp topographies, ERP noise, and ERP statistical power as a function of number of trials. We extended past work showing active electrodes' insensitivity to moderate levels of interelectrode impedance when compared to passive electrodes in the same amplifier. Importantly, the new dry electrode system could reliably measure EEG spectra and ERP components comparable to traditional electrode types. As expected, however, dry active electrodes with very high interelectrode impedance exhibited marked increases in single-trial and average noise levels, which decreased statistical power, requiring more trials to detect significant effects. This power decrease must be considered as a trade-off with the ease of application and long-term use. The current results help set constraints on experimental design with novel dry electrodes, and provide important evidence needed to measure brain activity in novel settings and situations.