Genetics of Mathematical Aptitude

Normative variation in mathematical aptitude (MA) is relevant to many aspects of societal functioning, in particular for occupations in science, technology, engineering and mathematics (STEM). Though elements of numerosity have been identified in some animals, complex MA is uniquely human. Several studies, using a variety of designs, have investigated the heritability of MA, and the extreme ends of the dimension of this trait – mathematics learning disability (MLD) and mathematical talent (MT). Initial estimates of the heritability of MA ranged from 0.2 to 0.9, while later studies identify more modest heritabilities for MA. Modest heritabilities have also been identified for MLD and MT. Despite this, genome-wide association studies have had limited success. Additionally, MAmay have similar genetic architectures to MLD and MT. Finally, while existing studies have tried to understand the genetic architecture of MA as a whole, different domains within MA may have different genetic architectures.