Published online by Cambridge University Press: 19 February 2026
A number of recent attempts by nonlinguists to reconstruct linguistic evolutionary trees have made news. Reconstructions of the phylogeny of the Indo-European (IE) family of languages are especially well represented; well-known examples include Rexová et al. 2003, Gray & Atkinson 2003—which is discussed by Searls (2003) and briefly reported in U.S. news & world report (10 December 2003)—and Forster & Toth 2003, which also generated considerable attention in the popular media. Scientific linguists have not been impressed for a variety of reasons. Though no two of the publications in question exhibit exactly the same weaknesses, all can be impugned on one or more of the following grounds: the linguistic data employed have not been adequately analyzed, or—in some cases—even competently analyzed; the model of language change employed has not been shown to fit the known facts of language change; attempts to fix the dates of prehistoric languages have ignored the fatal shortcomings of glottochronology discovered by Bergsland and Vogt (1962; see further §4); the researchers assume that vocabulary replacement is governed by a LEXICAL CLOCK (similar to the controversial MOLECULAR CLOCK posited by some biological cladists); and/or the data set used is too small to yield statistically reliable conclusions.