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原文連結
論文資訊
- 類型：已發表論文
- 日期：2013-05-06
摘要
The search for ever deeper relationships among the World's 語言s is bedeviled by the fact that most words evolve too rapidly to preserve evidence of their ancestry beyond 5,000 to 9,000 y. On the other hand, quantitative modeling indicates that some "ultraconserved" words exist that might be used to find evidence for deep linguistic relationships beyond that time barrier. Here we use a 統計 model, which takes into account the frequency with which words are used in common everyday speech, to predict the existence of a set of such highly conserved words among seven 語言 families of Eurasia postulated to form a linguistic superfamily that evolved from a common ancestor around 15,000 y ago. We derive a dated 系統發育 tree of this proposed superfamily with a time-depth of similar to 14,450 y, implying th
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