Fig. 2

The effects of anodal tDCS combined with attention on motor evoked potentials (MEPs). MEP amplitudes at the first dorsal interosseous (FDI; a), abductor pollicis brevis (APB; b), and extensor carpi radialis (ECR; c) muscles were normalized to the baseline amplitude (%) for each condition. White box plots denote anodal tDCS applied while participants paid attention to the target FDI muscle. Light gray box plots denote anodal tDCS applied while participants paid attention to the sound. Dark gray box plots denote anodal tDCS applied without participants paying attention to the target FDI muscle or the sound. Median and interquartile ranges are represented by horizontal lines within boxes and whiskers (representing minimum and maximum values), respectively. Asterisks indicate significant differences (P < 0.05) among the interventions