marginally significantp = 0.055
The mean difference waves within 250–350 ms were significantly different from zero for children with ADHD in both conditions (low demand: t (44) = 5.955, p < 0.001, Cohen’s d = 0.888; high demand: t (44) = 5.930, p < 0.001, Cohen’s d = 0.884) and for TD children in the high-demand condition ( t (44) = 4.381, p < 0.001, Cohen’s d = 0.653); the difference was marginally significant for TD children in the low-demand condition ( t (44) = 1.968, p = 0.055, Cohen’s d = 0.293).