Fig. 7
The potentiating effects of tDCS on BCI training in regard to improving upper extremity function. The meta-analysis indicated that the tDCS could not further potentiate the clinical effects of BCIs in regard to improving upper extremity motor function in patients with stroke (SMD = − 0.30; 95% CI = − 0.96 – 0.36; I2 = 0%; P = 0.370; fixed-effects model)