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. 2020 Feb 26;10:3438. doi: 10.1038/s41598-020-60406-7

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© The Author(s) 2020

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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Variability of % connections as a function of normalized node degree. Fraction of rich, feeder and local connections are reported in the left, middle and right panels, respectively. Red and blue lines refer to positive and negative networks, respectively. The node degree was normalized to the maximum value for each subject. As for the feeder connections, notice the lower peak of the positive functional brain networks as compared to the negative ones. The fraction of connection is calculated taking into consideration the total number of links in the matrix, namely summing the rich, feeder and local connections at the given normalized node degree.