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. 2018 Nov 20;8:17063. doi: 10.1038/s41598-018-35333-3

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© The Author(s) 2018

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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(a) (left to right) Average positive BOLD signal in the ROI of an example subject is shown for two trials in a single AVF run. The third panel shows the first PC obtained using PCA decomposition across all trials. (b) The percentage of variance explained by the first PC for all 7 subjects is plotted for the two acquisition approaches. The star and circle represent the group average percentage explained variance. The shaded regions and error bars indicate the standard error of the mean (SEM).