The number of muscle pairs with correlated scores.

Dots show the number of moderate or strong (coefficient of determination R² > 0.5) linear regressions between pairs of different muscles out of 66 muscle pairs for each participant. Red lines and shaded areas show means and standard deviations, respectively. The left plot is based on regressions between EMG V₁ scores; the right plot is based on regressions between EMG V₂ scores. Llat and Lmed indicate reaching with the left arm in the lateral and medial workspaces, respectively; Rlat and Rmed indicate reaching with the right arm in the lateral and medial workspaces, respectively.