Evidence for syntax as a signal of historical relatedness

In addition to its theoretical impact, the development of molecular biology has brought about the possibility of extraordinary historical progress in the study of phylogenetic classification of different species and human populations (especially cf. Cavalli Sforza et al., 1994, among others). We argue that parametric analyses of grammatical diversity in theoretical linguistics, stemming from Chomsky (1981), can prompt analogous progress in the historical classification of language families, by showing that abstract syntactic properties are reliable indicators of phylogenetic relations. The pursuit of this approach radically questions the traditional belief in the orthogonality of grammatical typology and language genealogy, broadly supporting Nichols’ (1992) program, and ultimately contributes to establishing formal grammar as a population science and historical linguistics as an important part of cognitive inquiry.