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. 2020 Mar 23;10:5218. doi: 10.1038/s41598-020-62154-0

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Spectral power around 50 Hz for the dry (red) and wet (blue) EEG systems. Left two bars: 25-/50-/75-percentiles observed during dry and wet electrode recordings at those electrode locations of all subjects where the dry electrode impedances were below the median (0.31 MOhm). Asterisk denotes significant difference between wet and dry EEG systems. Right two bars: Same as above, for impedances above the median. Asterisk denotes significant difference between wet and dry EEG systems.