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. 2019 Apr 5;6:19. doi: 10.1038/s41597-019-0027-4

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© The Author(s) 2019

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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Fig. 4 — The layout of electrodes and impedance of electrodes in the EEG cap used in the experiments. (a) The blue electrodes use the international 10–20 system, and the green electrodes are additional electrodes on the cap. (b) The contact impedance between all of the electrodes and the skin was kept below 5 kΩ.