Citation

Faurie C, Raymond M. Proc. Biol. Sci. 2005; 272(1558): 25-28.

Affiliation

Genetics of Adaptation, Institute of Evolutionary Sciences (UMR CNRS 5554), University Montpellier II, CC 065, 34095 Montpellier 5, France. faurie@isem.univ-montp2.fr

Copyright

(Copyright © 2005, Royal Society of London)

DOI

unavailable

PMID

15875566

PMCID

PMC1634940

Abstract

Humans exhibit hand preference for most manual activities in which they are specialized. Right- and left-handers have coexisted at least since the Upper Palaeolithic, and left-handers are in the minority in all human populations. The persistence of the polymorphism of handedness is a puzzle because this trait is substantially heritable and several fitness costs are associated with left-handedness. Some countervailing benefit is required to maintain the polymorphism. Left-handers may have a frequency-dependent advantage in fights--the advantage being greater when their frequency is lower. Sports data from Western societies are consistent with this prediction. Here, we show that the frequency of left-handers is strongly and positively correlated with the rate of homicides across traditional societies. It ranges from 3% in the most pacifistic societies, to 27% in the most violent and warlike. This finding is consistent with a frequency-dependent selection mechanism maintaining left-handedness in these societies.