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Authoritative: http://dx.doi.org/10.1038/nn0408-382   (Publisher's PDF... likely be available here.)

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Abstract

Language is unique to humans, but did it evolve gradually or suddenly, from a chance mutation or as a consequence of a larger brain? Two studies now suggest that language may have arisen gradually from precursors in other primates.

@article{ghazanfar08neuralDifference,
  author={Asif A. Ghazanfar},
  title={Language evolution: neural differences that make a difference},
  journal={Nature Neuroscience},
  year={2008},
  volume={11},
  number={4},
  pages={382-384},
  doi={10.1038/nn0408-382},
  url={http://www.isrl.uiuc.edu/~amag/langev/paper/ghazanfar08neuralDifference.html}
}