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. 2022 Feb 16;12:2650. doi: 10.1038/s41598-022-05810-x

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© The Author(s) 2022

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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The positions of the EEG electrodes are shown by red circles. These electrodes cover the frontal lobe (by Fz), central lobe (by C3, C4, and Cz), temporal lobe (by T7 and T8), and parietal lobe (by PO7 and PO8). Two EOG electrodes (not shown here) were also placed in the lower and upper areas of the right eye to record eye movements. The ground electrode was placed in the AFZ position, marked by a yellow circle.