Statistical analyses
TD
The Shapiro-Wilk test was used to verify the normality of the ERP and ERSP responses of the TD and ASD groups under different experimental conditions. Extreme points (two for TD, three for ASD) located outside two standard deviations were excluded prior to the analysis. A paired-sample Under each stimulus condition, a linear mixed-effect model (LMM) was built with drug dose and group as fixed-effect variables and subject as random-effect variable. This provided a measure of differential modulations by arbaclofen in TD and ASD as a group-drug interaction. When a significant group-drug interaction was observed, the LMM model shrank to a simple linear model with drug dose as the fixed-effect variable and subject as the random-effect variable, separately applied to TD and ASD. Finally, age was added as a fixed variable to the LMM model and the analysis was repeated to control for the age effect on the main outcomes.