marginally significantp = 0.082
To further examine variance differences, a two-way Brown–Forsythe ANOVA on absolute deviations from group medians showed a significant main effect of difficulty on response variance (F(1,76) = 61.06, p < 0.001), no significant main effect of period (F(2,76) = 1.12, p = 0.331), and a marginally significant difficulty × period interaction (F(2,76) = 2.58, p = 0.082).