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. 2021 Jul 13;11:14381. doi: 10.1038/s41598-021-93849-7

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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 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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Coherence averaged across all subjects. (A) The plots show the coherence between 19 pairs of scalp electroencephalography electrodes in each frequency band at baseline (upper) and after coffee consumption (low). (B) Brain topologies of functional connectivity at baseline (upper) and after coffee consumption (low) are presented. (C) Each column corresponds to a frequency band as indicated on the top of the figure. Coherence matrices corresponding to the resting-state EEG before and after coffee consumption are plotted on the first and second rows, respectively; to avoid confusion from too many lines, those of coherence less than 0.5 are not shown. The third row displays the top 10 most increased lines.