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. 2021 Feb 17;11:3977. doi: 10.1038/s41598-021-83420-9

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Examples of the result of the application of the preprocessing steps to the ΔHbO₂ (top), ΔHHb (middle), and ΔoxCCO (bottom) signals of one participant. Panel (A) shows the application of motion artifact correction method, where examples of artifacts are circled in light blue. Panel (B) shows the results of the FIR band-pass filtering. Raw uncorrected ΔHbO₂/ΔHHb,/ΔoxCCO are shown in black,; processed ΔHbO₂, ΔHHb, and ΔoxCCO are shown in red, blue and green respectively. Yellow areas mark the visual task blocks.