Fig. 4

The effect of dual-tDCS in movement-related neural power in stroke survivors (N = 11). a The baseline peak amplitude of ipsilesional (or right for healthy controls) primary motor cortex (M1) event-related desynchronization (ERD) and event-related synchronization (ERS) in α- and β-frequency band before transcranial direct current stimulation (tDCS) was applied. b Time course of movement-related power in the ipsilesional M1 in α (black) and β (gray) frequency band before (dashed) and after (solid) tDCS. The effects of modulation mostly occurred during ERS of α band as indicated by black arrowheads. c Same as A, but the average across individuals of the individuals’ strongest ERS deflection is shown. d Correlation between stimulation-related change of ipsilesional M1 α-ERS (difference between real and sham tDCS) and motor function (ARAT: closed circles and sloid regression line; FMA-UE: open circles and dashed regression line). * p < 0.025, ** p < 0.005, α = 0.025