Cathodal stimulating the left DLPFC changes risk disposition toward common risky behaviors in daily-life.

•Two studies were performed with HD-tDCS over the left DLPFC with naïve subjects.•Cathodal tDCS reduced attitudes and intentions toward risky behaviors.•No changes in attitudes and intentions were found toward control behaviors.•The reductions were larger in the tDCS group than in the sham group.•Results highlight the importance of left DLPFC in mediating daily risky behaviors.