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. 2020 Apr 24;10:6976. doi: 10.1038/s41598-020-63933-5

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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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Cortical reconstructions of the neural sources for observed oscillatory patterns during N2 sleep in comparison to the awake resting state with closed eyes. Panels (A–H) show various general and sleep- specific frequency bands: (A) delta (1–4 Hz), (B) theta (4–8 Hz), (C) alpha (8–12 Hz), (D) beta (14–30 Hz), (E) low gamma (30–60 Hz), (F) high gamma (60–100 Hz), (G) slow wave oscillations (0.2–1.2 Hz) and (H) the sleep spindle spectrum (12–15 Hz). Red correspond to amplitude increases relative to the awake state, blue represent decreases in spectral amplitude in the respective frequency band; all activity changes are thresholded at p < 0.05, FDR-corrected.