Resting state EEG is highly heritable (Malone et al., 2014; van Beijsterveldt et al., 1996), with studies reporting heritability (h2) estimates of monopolar resting state EEG power ranging from 0.49 to 0.85 (Malone et al., 2014; Smit et al., 2005; van Beijsterveldt et al., 1996). Bipolar EEG derivations offer an improvement over monopolar EEG derivations in the spatial resolution of the electrical sources, and reduce volume conduction effects (Ingber and Nunez, 1995; Nunez et al., 1997). In addition, the stability of EEG signals is excellent and under standardized conditions, there are high test-retest correlations. Studies that have examined the heritability of bipolar eyes-closed resting EEG power have shown comparable estimates to monopolar derivations (Tang et al., 2007b) and indicate that bipolar derivations are in greater accord with genetic findings in brain anatomy (Tang et al., 2007a). Despite the high heritability estimates provided by twin and family studies, there have been relatively few large (i.e., adequately powered) genetic studies of beta EEG (Iacono et al., 2016), and to date only one finding has replicated. An early analysis found linkage between beta
