In their recent article, Hong et al1 reported heritabilities of auditory sensory gating. As they defined it in their article, heritability reflects the proportion of overall variability in a trait in a population that results from additive genetic effects. Within human populations, such estimates have traditionally relied on special relationships that can (with some well-understood limitations) disentangle genetic from familial-environmental effects. The most popular of these methods have been twin studies comparing monozygotic and dizygotic twin pairs and various adoption designs.
Kendler KS, Neale MC. “Familiality” or Heritability. Arch Gen Psychiatry. 2009;66(4):452-453. doi:10.1001/archgenpsychiatry.2009.14