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. 2018 Jul 26;12:41. doi: 10.3389/fnbot.2018.00041

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Copyright © 2018 Legrand, Merad, de Montalivet, Roby-Brami and Jarrassé.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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s, spectral arc length of $\overset{\cdot}{β}$ , for the three regression models. The more negative, the less smooth. Values are averaged over subjects. From left to right: s for targets of distance 1, s for targets of distance 2 and mean of s over targets. Straight and dotted red lines are respectively the mean and standard deviation of the values from natural reaching motions without the prosthesis. Numbers correspond to the targets location, see Figure 2. *indicates a statistically significant difference (p < 0.05).