Supporting Information

Additional Supporting Information may be found in the online version of this article:

Figure S1: Distribution of family sizes in the GWAS sample.

Figure S2: 10–20 International system electrode montage used to record ERO. Frontal midline location (Fz in red) was used for primary analysis; Central (Cz) and parietal (Pz) locations in blue - used in secondary analysis.

Figure S3: QQ plot of GWAS results for theta power at Fz. The genomic control inflation factor λ is 1.00.

Table S1: Imputed SNPs in KCNJ6 with P < 1 × 10−5 associated with theta power at Fz.

Table S2: SNPs in CHRM2 and GRM8 with p < 0.05 associated with theta power at Fz.

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