Autism spectrum disorder is a dynamic disorder with complex changes over time from childhood into adulthood (Lange et al., 2015). The hypothesis of early brain overgrowth in children with ASD among aged 2–4 years is one of the most prominent theories (Courchesne et al., 2001; Sparks et al., 2002). To our knowledge, many literature on EEG coherence have focused on autistic adolescents and adults, but only a few EEG studies have concerned with children with ASD. In this study, we used resting state EEG coherence to reveal functional connectivity characters in children with ASD. We hypothesized that long‐distance and short‐distance coherence would be atypical in ASD, and these alterations in functional connectivity may be associated with symptom severity. Our findings provide electrophysiological evidence to further understand the characteristics of brain connectivity patterns in children with ASD.
