lowest frequencies, especially the theta band. This difference between higher and lower frequencies may reflect the fact that activity in higher frequencies predominate in the resting EEG, whereas lower-frequency activity is more vulnerable to artifacts and can reflect drowsiness, which may have escaped our data-cleaning procedure. In general, the SNP heritability estimates from measures derived from the Cz electrode fell short of the biometric estimates, thus indicating that genetic effects other than those captured by the common SNPs on the Illumina chip contribute to the observed biometric heritability.
