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. 2021 May 13;11:76. doi: 10.1186/s13613-021-00854-0

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© The Author(s) 2021

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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Fig.2 — Similarity between EEG variables computed from the standard and frontal montages. a Spearman correlation matrix showing strong association between standard (std, red fonts) and frontal (4-front, blue fonts) derived Synek score (ρ = 0.79, p < 0.001). On the same matrix, we also show strong association between std and 4-front estimated background rhythm (ρ = 0.66, p < 0.001). Confusion tables between std and 4-front montages computed for the absence of reactivity (b) and the discontinuity (c)