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Related Experiment Video

Updated: Feb 26, 2026

Author Spotlight: Advancements in the Fabrication of Synthetic Vocal Fold Models for Phonetic and Robotic Applications
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Comment on "Monkey vocal tracts are speech-ready".

Philip Lieberman1

  • 1Department of Cognitive and Linguistic Sciences, Brown University, Providence, RI 02912, USA.

Science Advances
|July 12, 2017
PubMed
Summary
This summary is machine-generated.

Human speech evolution required more than just brain changes; vocal anatomy also played a crucial role. Monkey vocal tracts, while capable of monkey sounds, cannot produce articulate human speech, challenging recent claims.

Keywords:
Acoustic theory of speech productionformant frequenciesquantal vowelsspecies-specific human vocal tractvocal tract normalization

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Primatology
  • Speech science

Background:

  • The evolution of human speech is a complex process involving both neural and anatomical changes.
  • Previous research has explored the capabilities of non-human primate vocal tracts in relation to speech production.
  • A recent study suggested that monkey vocal tracts are 'speech-ready,' implying neural changes were primary for human speech evolution.

Purpose of the Study:

  • To critically evaluate the claim that monkey vocal tracts are 'speech-ready'.
  • To reassess the role of vocal tract anatomy versus neural changes in the evolution of human speech capabilities.
  • To reconcile conflicting findings regarding primate vocal anatomy and speech evolution.

Main Methods:

  • Comparative analysis of existing data on monkey and human vocal tract anatomy and function.
  • Review and synthesis of published research, including the authors' own previous work and independent studies.
  • Linguistic and acoustic analysis of primate vocalizations and their limitations for human speech.

Main Results:

  • Monkey vocal tracts are anatomically limited and cannot produce the full range of sounds required for articulate human speech.
  • The premise that monkey vocal tracts are 'speech-ready' is inconsistent with presented data and prior research.
  • Independent studies since the 1950s support the significant role of vocal anatomy in human speech evolution.

Conclusions:

  • The evolution of human speech capabilities necessitated significant modifications to vocal anatomy, not solely neural changes.
  • The claim that neural changes were the primary driver, independent of vocal anatomy, is not supported by the evidence.
  • A comprehensive understanding of speech evolution requires considering the interplay between vocal tract anatomy and neural adaptations.