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. 2017 Jan 31;14:8. doi: 10.1186/s12984-017-0217-2

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© The Author(s). 2017

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Interaction forces during the predictable and unpredictable partnered stepping task (PST). a Histograms depicting the distribution of the interaction forces observed during the predictable (left) and unpredictable (right) PST. The distribution of observed interaction forces was larger during the unpredictable than predictable PST, as well as for dyads with an expert leader regardless of the version of the PST. b The difference in the distribution of the histograms is reflected in the differences of the mean of the peak interaction force across trials between groups. While larger peak interaction forces were observed in EE dyads than the EN and NN dyads during the predictable and unpredictable PST, only the difference between the EE and NN dyads was found to be significant (p = 0.01)