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. 2018 Dec 18;9:1804. doi: 10.3389/fphys.2018.01804

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Copyright © 2018 Chan, Cheng, Wu, Wu, Liu, Shaw, Liu and Davenport.

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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Scatter plots showing the correlations between the participants' subjective ratings on breathlessness and the brain area activation levels (measured by the beta values); the solid line indicated there was a significant correlation (p < 0.05) and the dotted line indicated there was no statistically significant correlation (p > 0.05). Correlations between self-reported breathlessness level and left middle frontal cortex and left inferior frontal cortex (A), bilateral thalamus (B), bilateral inferior parietal cortices (C), and bilateral caudate (D).