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. 2017 Jun 12;7:3252. doi: 10.1038/s41598-017-03627-7

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© The Author(s) 2017

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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Graphical representation of Coupled Linear Oscillator (CLO) model findings for heart rate and respiration (Fig. 2). Blue lines represent respiration inter-partner coupling and red lines represent coupling in heart-rate. The line’s thickness represents the strength of the coupling, with broken lines denoting a total lack of the coupling. (a) Coupling of respiration and heart rate during touch-pain condition. (b) Coupling of respiration and heart rate during touch-no pain condition. (c) No coupling of respiration and heart rate during no touch-pain condition. (d) Coupling of respiration and heart rate during no touch-no pain condition.