Figure 8.

Comparing encoding performance of models based on a functional division of the upper limb. A, We fit GLMs using either reach or grasp kinematic synergies. For each model type and animal, the distribution of median AUROCs across folds is shown as raw data (left column) and interquartile range + median (vertical and horizontal lines, respectively). B, Median AUROCs were compared between the full model that included both reach and grasp synergies and reduced models that contained only reach or only grasp synergies. C, Distribution of differences in reach and grasp AUROCs. We found that reach kinematic synergies were encoded preferentially by PMv in animal J and by PMd in animal L (significance codes: ***p < 0.0005 see text for additional statistics).