Fig. 2: Differences in classification performance across different bands and groups.

a ANOVA result; b AUC of L+R− group; c AUC of L−R+ group; d AUC of SHAM group. Note. In (b–d), the upper curve indicates the model whose performance was at the 75th percentile among all models, and the lower curve indicates the model whose performance was at the 25th percentile among all models. AUC area under the curve; L+R− anodal stimulation on F7 and cathodal stimulation on F8; L−R+ cathodal stimulation on F7 and anodal stimulation on F8; SHAM sham control for tDCS. *p < 0.05.