Fig 1.
Time course of Mu and beta EEG rhythms.
The graph shows the spectral perturbation of Mu (8–12 Hz) and beta (15–23 Hz) bands recorded in the left hemisphere (C3). The ‘X’ axis represent the time in milliseconds; whereas T1 (1500ms) and T2 (1900ms), represent the instants of TMS pulses and grey rectangles highlight the correspondent time-bin of EEG analyses. The ‘Y’ axis represents the log transformed ratio of the power at each time point relative to the average power of the respective condition. At the top of the figure we illustrate in a few frames the action presented in the video clips.
Fig 2.
Panel A represents data for Mu, while Panel B shows the Beta ERSP. Bars indicate confidence interval (95%), (*) indicate significant differences with p<0.05 and (•) a trend p<0.1.
Table 1.
Means and standard error of mean (SE) of Mu and beta ERSP for each condition (precision grip vs power grip) and time bin (t1 vs t2).
Fig 3.
Corticospinal excitability results.
Normalized MEPs amplitudes for each condition (Precision vs Power grip) in time points 1 (maximum hand aperture) and 2 (movement end). Bars represent confidence interval (95%). Asterisks indicate significant comparisons (p<0.05).
Table 2.
Means and standard errors of normalized MEPs amplitude for each condition (precision grip vs power grip) and time (t1 vs t2).
Table 3.
Pearson correlation for corrected Mu or beta rhythm and MEPs.
Table show r and p values for Precision and Whole grasp conditions in times 1 and 2 (Fig B in S1 File) and also for the time-windows preceding and following the TMS at t1 (1300-1500ms and 1500-1700ms) and at t2 (1700-1900ms and 1900-2100ms).