All of the four SNPs used in this study were analyzed in the family GWAS study by Kang et al. (2012). Three were found to be significantly associated with visual theta ERO power: two were directly measured (rs1787422, p < 2 × 10−7, rs858008, p < 5 × 10−6) and one was imputed (rs702859, p < 2 × 10−8); the other, rs2070995, was not significant at a p < 10−5 level. The results on KCNJ6 SNPs reported here are not directly comparable to those results because of the difference in the characteristics of the sample as well as the statistical methodology. The sample in Kang et al. (2012) was comprised of members of families of primarily European descent with mean age 31.2 years and an age range from 7 to 74 years. For each phenotype, only one value was used from each subject. The sample in this study is of heterogeneous descent between ages 12 and 25 and additionally multiple observations from the same individual were used. The regression method used here does not exploit family relationship data to establish
