At the same time, GCTA results indicate that common variants account for varying degrees of the variance in these EEG endophenotypes. For some endophenotypes, SNP heritability estimates were greater than half the heritability estimate. Thus, there appears to be substantial additive genetic variance related to EEG measures, which is consonant with our phenotypic heritability estimates. However, identifying specific genetic variants or genes remains a challenge. More sophisticated analytic methods might be useful.
