@article{ref1,
title="Handedness, homicide and negative frequency-dependent selection",
journal="Proceedings of the Royal Society - biological sciences",
year="2005",
author="Faurie, Charlotte and Raymond, Marissa",
volume="272",
number="1558",
pages="25-28",
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.",
language="",
issn="0962-8452",
doi="",
url="http://dx.doi.org/"
}