Figure 2.

The time evolution of grand average detrended fluctuation analysis (DFA) scaling exponents of broadband electroencephalography (EEG) (H_BB) in C3, Cz, and C4 during different movement and motor imagery tasks. The progression of the grand average of mean H_BB of all participants during (A) single asynchronous right (red) and left (blue) finger tap and resting state (black), (B) continuous right (magenta) and left (cyan) fist open-close movement, (C) continuous both feet (orange) and both fist (green) open-close movement, (D) motor imagery of continuous right (dashed magenta) and left (dashed cyan) fist open-close, (E) motor imagery of continuous both feet (dashed orange) and both fist (dashed green) open-close. Shaded areas show the standard deviation. Solid vertical line at 0 s marks finger tap onset in (A) and motor task cue in (B–E). Dotted gray vertical lines show the period in which H_BB of motor task trials is significantly different (p < 0.05, Mann–Whitney U-test) from that of resting state trials. The H_BB shows clear increase during all motor tasks.