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Why did language develop?

J F Stein1

  • 1University Laboratory of Physiology, Parks Road, Oxford OXI 3PT, UK. john.stein@physiol.ox.ac.uk

International Journal of Pediatric Otorhinolaryngology
|December 10, 2003
PubMed
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Human language evolved gradually over millions of years, not suddenly. Key adaptations include specialized brain functions, mirror neurons for imitation, and a descended larynx for vocal range.

Area of Science:

  • Evolutionary biology
  • Neuroscience
  • Linguistics

Background:

  • Language is a complex human trait with debated origins.
  • Previous theories, like Chomsky's, suggested a more sudden development.
  • Understanding language evolution requires examining key biological adaptations.

Purpose of the Study:

  • To propose a gradual, multi-stage evolutionary model for language development.
  • To identify critical biological adaptations that underpinned language evolution.
  • To challenge sudden-evolution theories of language.

Main Methods:

  • Review of paleontological and evolutionary timelines.
  • Analysis of neurobiological developments in primates and early hominids.
  • Examination of anatomical changes, such as laryngeal descent.

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Main Results:

  • Left-sided brain specialization for vocalizations emerged over 200 million years ago.
  • Mirror neurons in primates (approx. 45 million years ago) enabled imitation.
  • Laryngeal descent (approx. 100,000 years ago) expanded vocal range.

Conclusions:

  • Language evolved incrementally, building on pre-existing adaptations.
  • These adaptations served diverse functions before being co-opted for language.
  • Gradual evolution provides a more parsimonious explanation for language origins.