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. 2017 Jul 25;7:6461. doi: 10.1038/s41598-017-06340-7

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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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Effect of fNIRS signal acquisition duration on the accuracy and stability of global efficiency and local efficiency. The plots of the correlation strength calculated for global efficiency (a) and local efficiency (b) between short and long (10.0 min) signal durations. The red-filled circles indicate a significant correlation between global/local efficiency calculated with short and long (10.0 min) fNIRS signal acquisition durations. For both global and local efficiency, the analyses revealed significant (P < 0.001) and strong correlations for almost all threshold conditions. Magnitudes of the global efficiency (c) and local efficiency (d) plotted according to the duration of the fNIRS signal acquisition (1.0~10.0 min with 30-sec bins). The blue-filled shapes indicate a significant difference in the magnitude of the computed value associated with a given fNIRS signal acquisition duration compared with the magnitude when computed using 10.0 min of fNIRS data.