Reaction time (RT, mean ± standard error [SE]) in congruent and incongruent trials of a cued Posner spatial attention task in 2 groups of children (Controls, ASD). Congruence (congruent, incongruent) had strong main effect on RT (F1,58=69.5, p<0.001, η2=0.56, observed power (π)=0.99). Congruence X Group interaction was moderately significant (F1,58=5.92, p=0.018, η2=0.10, π =0.67).