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. 2018 Sep 25;9:1338. doi: 10.3389/fphys.2018.01338

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Copyright © 2018 Niizeki and Saitoh.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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From the top, changes in EEG δ-activity (δ), RSA, breathing trace (Resp in arbitrary unit; upward deflections denote expiration), instantaneous phases for RSA (solid trace) and breathing (dotted trace), and phase coherence (λ) calculated from 20-s windows with a sliding window of 10-s for a 2-min portion around increased EEG δ-activity (A, 59–61 min) and decreased EEG δ-activity (B, 85–87 min). Bold dotted curve in the RSA panel indicates A_RSA. Data presented are form the same subject shown in Figure 2.