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. 2019 Jan 31;9:1063. doi: 10.1038/s41598-018-37873-0

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© The Author(s) 2019

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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Polar angle error evolution over the 10 sessions for the three participant groups. Split boxplot-histogram of the magnitude of polar error by session, results for all subjects combined by group. Boxplot and angular error axis scales (left); mean values (×); histogram value gray-scale maps provide numerical data references for number of occurrences of responses represented by the histograms (right). Boxplot diagrams indicate the 25^th percentile (Q1), median (Q2, comparison interval notch with significance α = 5%), and 75^th percentile (Q3), with data extent whiskers spanning the lowest and highest data points in the range Q1 − 1.5 × (Q3 − Q1) to Q3 + 1.5 × (Q3 − Q1).