Figure 2.

Rhythmicity at movement and submovement levels

(A) Power spectrum of finger velocity for all conditions (solo, dyad-in-phase/anti-phase; mean ± SEM). The main spectral component peaking around the instructed movement rate (i.e., 0.25 Hz) is denoted as F0 (black solid line). The spectral components peaking around 2.5 Hz (submovement-related) and around 0.8 Hz are denoted as F2 and F1, respectively (dashed lines), and also highlighted in the inset.

(B) Scatter plots showing (across-subjects) correlations of F0 peak frequencies with F1 (left) and F2 (right) peak frequencies for the solo (top) and dyadic (bottom) conditions. Data points represent individual participants. Lines represent the best-fitting linear functions (method of least squares).