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. 2021 Mar 3;11:5029. doi: 10.1038/s41598-021-84595-x

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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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Scree-plot of the PCA on the 27 items after synchronous condition. The eigenvalues are reported in the table below the graph. The black dots represent the eigenvalues of each component in decreasing order calculated on the real data. The red line shows the simulated data of the parallel analysis. Components above the red line are those indicated by the parallel analysis. The gap after the third component in the scree-plot suggests considering a three-components solution.