Ancestry-constrained phylogenetic analysis supports the Indo-European steppe hypothesis

@article{Chang2015AncestryconstrainedPA,
  title={Ancestry-constrained phylogenetic analysis supports the Indo-European steppe hypothesis},
  author={Will Chang and Chundra Aroor Cathcart and David Hall and Andrew Garrett},
  journal={Language},
  year={2015},
  volume={91},
  pages={194 - 244}
}
Discussion of Indo-European origins and dispersal focuses on two hypotheses. Qualitative evidence from reconstructed vocabulary and correlations with archaeological data suggest that Indo-European languages originated in the Pontic-Caspian steppe and spread together with cultural innovations associated with pastoralism, beginning c. 6500–5500 bp . An alternative hypothesis, according to which Indo-European languages spread with the diffusion of farming from Anatolia, beginning c. 9500–8000 bp… 
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