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. 2018 Nov 20;8:17089. doi: 10.1038/s41598-018-35613-y

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© The Author(s) 2018

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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Spatiotemporal analysis of theta oscillations. (a) Raw data recorded in all the channels, showing global 7 Hz low-amplitude theta oscillations under the anesthesia. (b) The amplitude maps for all the 64 channels at three different time points drawn from (a). (c) The phases of the electrical recordings that are filtered at theta band (5 Hz–9 Hz). The traces from all the 64 channels are plotted together to show synchrony among all the channels. (d) The phase maps at three different time points showing global stationary waves.