Autism spectrum disorder is an early‐onset disorder. Hyperconnectivity was prominent over frontal and central areas; the degree of hyperconnectivity at 14 months strongly correlated with the severity of restricted and repetitive behaviors in participants with ASD at 3 years in the alpha band (Orekhova et al., 2014). Over the past years, EEG coherence has been associated with clinical behavioral disorders in patients with ASD. Increasing evidence indicates that the primary reason of abnormal cognition and behavior in children with ASD lies in the defect of executive function (Gilotty, Kenworthy, Sirian, Black, & Wagner, 2002). Some researchers found that both patients with executive dysfunction and high functional ASD patients showed higher coherence on theta frequency band in resting state (Babiloni et al., 2004; Ford, Mathalon, Whitfield, Faustman, & Roth, 2002). Han YM combined clinical severities with coherence and suggested that the degree of executive dysfunction in patients with ASD may be closely related to their neural connection disorders (Han & Chan, 2017).
