Feedforward-related muscle synergies: leg model.

<p>A. We used a simplified model with 14 muscles/muscle groups to make feasible the computation of all possible muscle coordination patterns for foot forces in different directions (8 muscles are illustrated for clarity). B. We found that the leg in this posture had a highly elongated feasible force set compatible with prior work <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1002434#pcbi.1002434-Kuo1" target="_blank">[21]</a>, <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1002434#pcbi.1002434-McKay1" target="_blank">[36]</a>. We found all force levels (concentric circles) that could fit within the feasible force set. C. We found that the set of possible coordination patterns for forces in 16 directions was low dimensional for all force magnitude levels.