Ultraconserved words point to deep language ancestry across Eurasia

作者：Pagel Mark^*; Atkinson Quentin D; Calude Andreea S; Meade Andrew

来源：Proceedings of the National Academy of Sciences, 2013, 110(21): 8471-8476.

DOI：10.1073/pnas.1218726110

• cultural evolution
• phylogeny
• historical linguistics

The search for ever deeper relationships among the World%26apos;s languages 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 %26quot;ultraconserved%26quot; words exist that might be used to find evidence for deep linguistic relationships beyond that time barrier. Here we use a statistical 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 language families of Eurasia postulated to form a linguistic superfamily that evolved from a common ancestor around 15,000 y ago. We derive a dated phylogenetic tree of this proposed superfamily with a time-depth of similar to 14,450 y, implying that some frequently used words have been retained in related forms since the end of the last ice age. Words used more than once per 1,000 in everyday speech were 7- to 10-times more likely to show deep ancestry on this tree. Our results suggest a remarkable fidelity in the transmission of some words and give theoretical justification to the search for features of language that might be preserved across wide spans of time and geography.

• 出版日期2013-5-21