Some very specific prosodic innovations affected the Balto-Slavic linguistic community, probably at a time when it already showed internal dialectal differences. Whether those innovations were related to archaic remnants stemming from the parent Proto-Indo-European language, and whether that disintegrating community included different dialects, remains an object of active debate.
The main question about Balto-Slavic is whether this concept represents a single community, or it was rather a continuum formed by two (Baltic and Slavic) or possibly three (East Baltic, West Baltic, Slavic) neighbouring communities, speaking closely related Northern European dialects, which just happened to evolve very close … Read the rest “Balto-Slavic accentual mobility: an innovation in contact with Balto-Finnic”
Open access Population Size and the Rate of Language Evolution: A Test Across Indo-European, Austronesian, and Bantu Languages, by Greenhill et al. Front. Psychol (2018) 9:576.
Summary (emphasis mine):
What role does speaker population size play in shaping rates of language evolution? There has been little consensus on the expected relationship between rates and patterns of language change and speaker population size, with some predicting faster rates of change in smaller populations, and others expecting greater change in larger populations. The growth of comparative databases has allowed population size effects to be investigated across a wide range of language
… Read the rest “Population size potentially affecting rates of language change”
Recent chapter The Indo-Europeans and the Non-Indo-Europeans in Prehistoric Northern Europe, by Petri Kallio, In: Language and Prehistory of the Indo- European Peoples: A Cross-Disciplinary Perspective, Copenhagen (2017).
Interesting excerpts (emphasis mine), especially when read in combination with the most recent papers on Early Indo-Iranian, Corded Ware, and Fennoscandian genomes:
Like the Indo-Europeanists, also the Uralicists suffer from their “school who wants it large and wants it early”. This time, however, the desired homeland is even larger and earlier, covering the whole northern half of Europe already at the end of the
… Read the rest “On Proto-Finnic language guesstimates, and its western homeland”