highly significantp < .001
Within each diagnostic group, all paired comparisons between regions were highly significant (all p < .001).
Within each diagnostic group, all paired comparisons between regions were highly significant (all p < .001).
Post-hoc univariate analyses revealed that using the combined asymmetry index, the interaction was significant for the SCQ communication domain, F (1, 55) = 4.17, p = .04, η p 2 = .07, and the interactions approached significance for both the SCQ social and SCQ repetitive behavior domains, F (1, 55) = 3.27, p = .07, η p 2 = .06, and F (1, 55) = 2.88, p = .09, η p 2 = .05, respectively.
On the SCQ Communication domain, IQ and lateral frontal asymmetry were not related to individual differences in the HFA sample, however; within the comparison sample, lower IQ children with left lateral frontal asymmetry had the lowest levels of communication symptoms, significantly less than higher IQ children with left lateral frontal asymmetry, t (11) = −2.83, p = .016 and approaching significance compared to lower IQ children with right frontal asymmetry, t (14) = −1.86, p = .08 (see Table 3 ).