of age may be the reason why the results of power spectrum of individual ASD are inconsistent, so the characteristics of resting power spectrum related to ASD still need to be further explored. EEG coherence, a main method of EEG functional connectivity analysis, has been used to explore brain connectivity pattern and how different brain areas communicate with each other based on high temporal resolution. Two EEG coherence studies reported under‐ and over‐connectivity in different frequency bands in ASD patients (Courchesne, Campbell, & Solso, 2011; Murias, Webb, Greenson, & Dawson, 2007). The prevailing hypothesis in imaging studies is that brain connectivity of ASD is characterized by reduced long‐range functional connectivity and increased local functional connectivity (Barttfeld et al., 2011; Belmonte et al., 2004; Minshew & Williams, 2007; Rubenstein & Merzenich, 2003). Enhanced local coherence has been found over lateral‐frontal region in the delta band (Barttfeld et al., 2011), over left frontal and temporal regions in the theta band (Murias et 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
