http://esciencenews.com/articles/201...n.out.beringia
Linguists have studied the grammar and vocabulary of both languages and have concluded there may be evidence of migration from Eastern Russia back to Central Asia and others into North America. The scientists used a technique called phylogenetic analysis where a tree is drawn up which shows the shared traits that some languages may have with others and then this can be used to trace back a languages development.This model was then compared to migration patters of ancient peoples from various sub groups.
Results show an early dispersal of Na-Dene along the North American coast with a Yeniseian back migration through Siberia and a later dispersal of North American interior Na-Dene languages. Sicoli explained, "we used computational phylogenetic methods to impose constraints on possible family tree relationships modeling both an Out-of-Beringia hypothesis and an Out-of-Asia hypothesis and tested these against the linguistic data. We found substantial support for the out-of-Beringia dispersal adding to a growing body of evidence for an ancestral population in Beringia before the land bridge was inundated by rising sea levels at the end of the last ice age."
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