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. 2016 Jan 11;221(9):4475–4489. doi: 10.1007/s00429-015-1178-5

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Recording of circle drawing and calculation of the laterality indices (LI_CV). a Subjects were required to draw concentric superimposed circles on a digitizing tablet with their right dominant or left non-dominant hand. b Left and right hand traces were segmented into sequential up- and down-strokes and c the coefficient of variance (CV) of velocity stroke peaks (CV) was calculated separately for circle drawing movements with the right or left hand. d A laterality index (LI_CV) was calculated based on the mean CV of the right and left hand CV. e Histogram depicting the distribution of the LI_CV in the 52 participants (age range: 11–16 years)