highly significantp < 0.001
In fact, the Stroop effect was found for both, RTs and ERs: Overall, the effect of congruency was highly significant for RTs ( p < 0.001), with incongruent trials (mean RT = 682 ms; standard deviation SD = 148 ms) being answered 31 ms (or 5%) slower than congruent trials (mean RT = 652 ms, SD = 138 ms), as usual in the Stroop paradigm.