Finally, for the DMPFC source, there were main effects of cultural group, F(1, 35) = 14.73, p < 0.001, ηp2=0.30 (Chinese M = 0.34, SE = 0.020; European M = 0.24, SE = 0.019), go/no-go condition, F(1, 35) = 7.72, p < 0.01, ηp2=0.18 (go M = 0.27, SE = 0.013; no-go M = 0.31, SE = 0.019), and interval, F(4, 140) = 6.38, p < 0.001, ηp2=0.15 (250–300 ms M = 0.27, SE = 0.014; 300–350 ms M = 0.30, SE = 0.015; 350–400 ms M = 0.30, SE = 0.016; 400–450 ms M = 0.29, SE = 0.014; 450–500 ms M = 0.28, SE = 0.014) with greater activation for Chinese children and for no-go trials, and a difference between 250–300 ms vs. both 300–350 ms, 350–400 ms. These were qualified by a Go/no-go condition × Interval interaction, F(4, 140) = 4.40, p < 0.01, ηp2=0.11, and a Cultural group × Interval interaction, F(4, 140) = 4.87, p < 0.001, ηp2=0.12. Post hoc tests revealed that Chinese-Canadians showed more activation than European-Canadians especially between 250 and 350 ms, and that the differences between go and no-go trials (i.e., no-go > go) for this dorsomedial prefrontal region of interest was largest between 250 and 300 ms.