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Szamado, S. and Szathmary, E. (2006) Selective scenarios for the emergence of natural language. Trends in Ecology and Evolution, 21(10):555--61.

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   Authoritative: http://dx.doi.org/10.1016/j.tree.2006.06.021   (Publisher's PDF... likely be available here.)
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Abstract

The recent blossoming of evolutionary linguistics has resulted in a variety of theories that attempt to provide a selective scenario for the evolution of early language. However, their overabundance makes many researchers sceptical of such theorising. Here, we suggest that a more rigorous approach is needed towards their construction although, despite justified scepticism, there is no agreement as to the criteria that should be used to determine the validity of the various competing theories. We attempt to fill this gap by providing criteria upon which the various historical narratives can be judged. Although individually none of these criteria are highly constraining, taken together they could provide a useful evolutionary framework for thinking about the evolution of human language.
BibTex
@article{szamado06competingSelective,
  author={S. Szamado and E. Szathmary},
  title={Selective scenarios for the emergence of natural language},
  journal={Trends in Ecology and Evolution},
  year={2006},
  month={Oct},
  volume={21},
  number={10},
  pages={555-61},
  doi={10.1016/j.tree.2006.06.021},
  url={http://groups.lis.illinois.edu/amag/langev/paper/szamado06competingSelective.html}
}