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. 2018 May 15;12:177. doi: 10.3389/fnhum.2018.00177

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Copyright © 2018 Darling, Wall, Coffman and Capaday.

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 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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Examples of horizontal plane (A,C) and frontal plane (B,D) movement paths of the target and reaching index fingertips in the NVP and NVA conditions by subject S8. In each graph the plotted lines represent the reaching index fingertip voluntary movement (in the lighter color starting from near the origin) and target index fingertip passive movement (in the darker color starting about 51 cm left of the origin) for 4 trials with different directions (i.e., H30°V0°, H0°V0°, H30°V0°, H 60°V0° in the horizontal plane graphs and H0°V0°, H0°V30°, H0°V60°, H0°V90° in the frontal plane graphs). Tick marks on each axis represent 20 cm. Note the precise apposition of the two fingertips in all examples.