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. 2017 Aug 30;7:10027. doi: 10.1038/s41598-017-09970-z

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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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Paired changes of skin conductance (SC), P_ETCO₂, HR and the LF/HF ratio calculated from ECG data. Each panel includes a time series for each colour, as denoted. The time series are sub-divided into thirteen 2.5 min periods. The two bold vertical lines mark the light exposure period (Colour Stimulation). Time series are always normalized (subtracted, or for LF/HF divided by) to the last time point of the baseline (TP3). Hence the horizontal lines represent zero (one for LF/HF). ^‡Indicate significance of a change throughout the whole times series (Friedman tests and FDR correction, SC: p _all < 0.03, P_ETCO₂: p _all < 0.05, HR and LF/HF: p _all < 0.01). Asterisks indicate a significant change of the marked time point with respect to TP3 (Wilcoxon signed rank tests, uncorrected). Outliers are not displayed. TP: time point, BPM: beats per minute. HR: heart rate. ECG: electrocardiogram.