Statistics

Potential effects of group (TD, ASD-I, XYY-ASD, XYY+ASD) on age and neuropsychological assessments were evaluated with analysis of variance. Potential effects of group (TD, ASD-I, XYY-ASD, XYY+ASD), hemisphere (LH, RH) and token (/a/ and /u/) on MMF latency and amplitude were evaluated with full factorial linear mixed models (LMMs) using these factors as fixed effects and age as a covariate with subject as a random effect. LIs of MMF amplitudes were assessed using a linear mixed model with fixed effects of group and stimulus token, with age as a covariate and with subject as a random effect. Hierarchical regression assessed the influence of language and general cognitive ability above and beyond effects of age, hemisphere and token on MMF latency and amplitude. For the LIs, hierarchical regression also assessed the influence of language and cognitive ability above and beyond effects of age and token. Bonferroni correction was applied for multiple comparisons. All statistical analyses were performed with SPSS Statistics Version 25 (IBM, Armonk, USA).