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. 2019 Jun 8;19(11):2608. doi: 10.3390/s19112608

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Impedance characteristic of the electrodes: gold (Au), silver (Ag), silver/silver chloride (Ag/AgCl) and sintered bridge electrodes (SBE) in the brain activities 0.1–30 Hz after (a) the first; (b) the fifth; (c) the tenth; and (d) the twentieth EEG examinations with analysis of the variability of impedance. Within the box, a horizontal red line means the median value of the data set; whereas the bottom and top blue lines of the box indicate the 25th and 75th percentiles, the whiskers present min and max and the outliers are marked with the ‘+’ symbol.

Impedance characteristic of the electrodes: gold (Au), silver (Ag), silver/silver chloride (Ag/AgCl) and sintered bridge electrodes (SBE) in the brain activities 0.1–30 Hz after (a) the first; (b) the fifth; (c) the tenth; and (d) the twentieth EEG examinations with analysis of the variability of impedance. Within the box, a horizontal red line means the median value of the data set; whereas the bottom and top blue lines of the box indicate the 25th and 75th percentiles, the whiskers present min and max and the outliers are marked with the ‘+’ symbol.