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. 2021 Jan 14;11:54. doi: 10.1038/s41398-020-01185-7

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© The Author(s) 2021

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. 1 — The schematic represents a top view of the scalp, nose up. Coherence (solid lines) was computed between bipolar EEG signals, each of which was derived from a pair of adjacent electrodes (connected by dotted lines). Electrode labeling: letters F, C, T, P, and O represent frontal, central, temporal, parietal, and occipital areas of the scalp, respectively; odd and even numbers represent the left and right hemispheres, respectively, and “Z” denotes electrodes along the sagittal midline. 27 Coherences between bipolar electrode pairs are illustrated as follows: frontal-central sagittal coherences are represented in blue; (1) F8-T8--F7-T7, (2) F4-C4--F3-C3, (3) F3-C3--F8-T8, (4) F4-C4--F7-T7, (5) F3-C3--F7-T7, (6) F4-C4--F8-T8, (7) FZ-CZ--F7-T7, (8) FZ-CZ--F3-C3, (9) FZ-CZ--F8-T8, (10) FZ-CZ--F4-C4. Central-parietal sagittal coherences are represented in red; (11) T8-P8--T7-P7, (12) C4-P4--C3-P3, (13) C3-P3--T8-P8, (14) C4-P4--T7-P7, (15) C3-P3--T7-P7, (16) C4-P4--T8-P8, (17) T7-P7--CZ-PZ, (18) C3-P3--CZ-PZ, (19) T8-P8--CZ-PZ, (20) C4-P4--CZ-PZ, parietal-occipital sagittal coherences are represented in purple; (21) P4-O2--P3-O1. Intrahemispheric lateral coherences are represented in orange; (22) T7-C3--F7-F3, (23) P7-P3--F7-F3, (24) P7-P3--T7-C3, (25) T8-C4--F8-F4, (26) P8-P4--F8-F4, (27) P8-P4--T8-C4.