families. Overall, these findings provide further support for the transmission of LVEEG phenotype in families as a discrete, categorical trait and point to the chromosomal location of the underlying genetic locus, however, specific genes contributing to the LVEEG phenotype remain to be determined. More recently, a significant association between alpha power and a serotonin receptor gene (HTR3B) polymorphism was reported, yet, the association was present in two samples (American Caucasians and Plain Indians) but not in the third and the largest of the studied samples (Finnish)(Ducci et al., 2009). Another study performed in American Indian population found evidence for significant linkage on chromosomes 1 and 6 (Ehlers et al., 2010).
