Why Are Some People Left-Handed? An Evolutionary Perspective,Phil. Tran. Biol. Sc.
Excerpts: Since prehistoric times, left-handed individuals have been ubiquitous in human populations, exhibiting geographical frequency variations. Evolutionary explanations have been proposed for the persistence of the handedness polymorphism. (...) Data have suggested that left-handedness, as the rare hand preference, could represent an important strategic advantage in fighting interactions. However, the fact that left-handedness occurs at a low frequency indicates that some evolutionary costs could be associated with left-handedness. Overall, the evolutionary dynamics of this polymorphism are not fully understood. (...) We point out that hand preference is heritable, and report how hand preference is influenced by genetic, hormonal, developmental and cultural factors. (...)
- Source: Review. Why Are Some People Left-Handed? An Evolutionary Perspective, V. Llaurens, M. Raymond, C. Faurie, DOI: 10.1098/rstb.2008.0235, Philosophical Transactions: Biological Sciences, 2008/12/05