Fig. 2

The duration-discrimination threshold observed for each tDCS condition (sham, anode, and cathode). Individual duration-discrimination thresholds for three conditions (a); the mean duration-discrimination threshold for each tDCS condition (b). The participants performed all of the tDCS conditions in the within-subject experimental design. The statistical analysis detected a significant difference between the sham and cathodal tDCS conditions (p = 0.041), indicating that cathodal tDCS enhanced the participants’ duration-discrimination ability. Error bars indicate the standard error of the mean