al., 2007). By contrast, both intrahemispheric and interhemispheric reduced local coherence in all brain regions have been reported in delta and theta bands (Coben, Clarke, et al., 2008), while reduced local coherence over mid‐frontal region has been reported in the delta (Barttfeld et al., 2011) and alpha bands (Murias et al., 2007). However, EEG coherence demonstrated increased long distance for individuals with ASD (Duffy & Als, 2012). Machado et al. (2015) found that significantly higher intrahemispheric long‐range coherence in the left hemisphere in ASD children, supporting the hypothesis of over functional connectivity in ASD. Differently, Carson et al. supported that children with ASD displayed reduced long‐distance coherence at the alpha frequency during resting state (Carson, Salowitz, Scheidt, Dolan, & Van Hecke, 2014). Coben et al. elaborated that children with ASD showed decrease interhemispherical and intrahemispherical coherence in delta and theta frequency bands (Coben, Clarke, et al., 2008). Although the underlying understanding of the essence of functional connectivity in ASD is incomplete, current findings suggest that abnormal structural and functional connectivity patterns may be the potential neural mechanisms of typical cognitive and behavioral impairments in ASD.
