Climate, vocal folds, and tonal languages: Connecting the physiological and geographic dots

Caleb Everett, Damián E. Blasi, Seán G. Roberts

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

We summarize a number of findings in laryngology demonstrating that perturbations of phonation, including increased jitter and shimmer, are associated with desiccated ambient air. We predict that, given the relative imprecision of vocal fold vibration in desiccated versus humid contexts, arid and cold ecologies should be less amenable, when contrasted to warm and humid ecologies, to the development of languages with phonemic tone, especially complex tone. This prediction is supported by data fromtwo large independently coded databases representing 3,700+ languages. Languages with complex tonality have generally not developed in very cold or otherwise desiccated climates, in accordance with the physiologically based predictions. The predicted global geographic-linguistic association is shown to operate within continents, within major language families, and across language isolates. Our results offer evidence that human sound systems are influenced by environmental factors.

Original languageEnglish (US)
Pages (from-to)1322-1327
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number5
DOIs
StatePublished - Feb 3 2015

Keywords

  • Adaptation
  • Climate
  • Language
  • Tone

ASJC Scopus subject areas

  • General

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