correlation between autism and theta oscillations (r G = –.35, p = .009). Although deviant brain function in autism is most consistently found in the lower gamma band due to altered GABA inhibitory neuronal action (Blatt & Fatemi, 2011; Gandal et al., 2010; Nelson & Valakh, 2015; Rojas & Wilson, 2014), cortical and hippocampal theta/lower alpha are known to show phase‐amplitude coupling with fast oscillations (gamma; Canolty et al., 2006; Khan et al., 2013; Lisman & Jensen, 2013). The significant genetic correlation (r G = .22, p = .019) between heart rate and alpha power is consistent with observations in concurrent EEG and ECG recordings (de Munck et al., 2008).
