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. 2013 Nov 13;7:155. doi: 10.3389/fncom.2013.00155

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Copyright © 2013 Rácz and Valero-Cuevas.

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) or licensor 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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Representative plot of the experimental normal forces now projected onto the principal components for the same representative trial as in Figure 4without visual feedback. Top: The force fluctuations on the plane spanned by the Grasp and Compensation Modes. Bottom: The three principal component time series during a trial plotted individually. Note how the Grasp Mode captures the common downward trend, while the Compensation and Hinge Modes have relatively lower variability.