Under some circumstances, ERP amplitude has been shown to decrease over multiple trials (e.g., Maurer et al., 2008). Therefore, in order to evaluate whether increased variability in the participants with ASD may reflect a larger habituation-effect, linear regressions of trial number against (IC) peak amplitude were computed for each participant. Mean slope size did not differ between groups however, indicating that this was not the case (TD mean β = −0.04 [−0.13 0.05], ASD mean β = −0.06 [−0.15.03], t(23) < 1, p > 0.1.
