Fig. 2

Correlation analysis. a The total mechanical work performed during motor exploration force training significantly correlated with changes in velocity coverage. Each data point represents an individual participant. The size of each data point is proportional to that participant’s velocity coverage during Baseline (session 2). For the Force group (black closed circles), participants with greater initial velocity coverage (evident of larger data points) tend to exert more total work during Training and showed greater gains in velocity coverage. This trend was not observed in the Control group (black open circles). b The breakdown of work reveals subcomponents that significantly correlated with changes in velocity coverage. A single pair of open (Control group) or closed (Force group) red triangle (Positive Work) and blue circle (Negative Work) along the x axis (the Training axis on each plot) represents an individual participant. Regression lines only shown for statistically significant correlation (α < 0.05) observed in the Force group