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. 2021 Feb 26;11:4744. doi: 10.1038/s41598-021-82265-6

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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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Stability of performance in different experimental sessions. The Performance Index (a) and the Scanning Rate (b) have been recorded in four different experimental sessions (trials). Values relative to the second, third and fourth trial have been plotted as a function of the initial value. The corresponding coefficients of correlation and regression lines equations have been reported in both A and B. Dotted lines represent equal values on X and Y axes.