Natural selection as we speak

The forces of variation and selection which shape human language have become issues of extensive research. Documentation of sounds and sound patterns, and their evolution over the past 7000-8000 years allows linguists to quantify the important role of human perception, articulation and imperfect learning as language is passed from one generation to the next. At this year's AAAS conference in Washington, DC, Juliette Blevins, senior scientist at the Max Planck Institute for Evolutionary Anthropology in Leipzig, presents a new approach to the problem of how genetically unrelated languages across the world often show similar sound patterns, without invoking innate mechanisms specific to grammar. Languages as far apart as Native American, Australian Aboriginal, Austronesian and Indo-European show similar patterns of vowel and consonant inventory and distribution, but exceptions to sound patterns regarded as universal show that these similarities are best viewed as the result of convergent evolution.

A new model of sound change shows that evolutionary principles can account for striking phonetic similarities across unrelated languages, as well as the rarity of certain sounds. German and Russian are not the only languages in the world where sounds like b, d, and g lose their characteristic vocal fold 'buzz' at the end of the word. Dozens of unrelated languages, from Afar on the sands of Ethiopia, to Ingush in the northern Caucasus have similar sound patterns. Why are these patterns found in unrelated languages? Why do languages favour silent p t k sounds over noisy b d g sounds at the end of the word? And why are these sounds common, while clicks have arisen only once in human history? Dr. Juliette Blevins, Senior Scientist at the Max Planck Institute for Evolutionary Anthropology, Leipzig, provides answers to these and many other phonological puzzles in a symposium on Evolutionary Phonology at the 2005 AAAS Annual Meeting, in Washington, DC.


Contact: Dr. Juliette Blevins

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