3.2 Reaction time
For the reaction time of phosphene response, the ANOVA test revealed significant main effects of polarity (F (2,48) = 3.797, p = 0.029, ηp2 = 0.137). Post-hoc comparisons with Bonferroni corrections indicated that reaction time for tACS was significantly faster than cathodal otDCS (p = 0.035) but not anodal otDCS (p =1). We also found significant main effect of AM (F (1,24) = 26.715, p < 0.001, ηp2 = 0.527) and intensity (F (1,24) =47.562, p < 0.001, ηp2 = 0.665), showing that RTs were shorter for sinusoidal (1746.57 ± 232.69 ms) than AM (2051.10 ± 192.01 ms) stimulation, and for supra-threshold (1772.25 ±210.12 ms) than the threshold (2025.42 ± 205.77 ms) intensity (Figure 2B).