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Functionally referential communication in a chimpanzee.

Katie E Slocombe1, Klaus Zuberbühler

  • 1School of Psychology, University of St. Andrews, Scotland.

Current Biology : CB
|October 11, 2005
PubMed
Summary
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Chimpanzee rough grunts function as referential signals, conveying information about food. This finding supports vocal origins of language evolution in our closest living relatives.

Area of Science:

  • Primate communication
  • Evolutionary linguistics
  • Animal behavior

Background:

  • The evolutionary origins of referential speech remain unclear.
  • While some monkeys use referential calls, apes have not shown similar abilities, suggesting their vocalizations are not sophisticated.
  • This has led to theories favoring gestural communication in ape language evolution.

Purpose of the Study:

  • To investigate if chimpanzee "rough grunts" function as referential signals.
  • To determine if these vocalizations convey specific information about food types.
  • To assess the role of vocal communication in the evolution of language.

Main Methods:

  • Recorded chimpanzee "rough grunts" during feeding contexts with various food items.
  • Analyzed acoustic properties of "rough grunts" to identify distinct types.

Related Experiment Videos

  • Conducted a naturalistic playback experiment using recorded grunts to test comprehension.

    • Main Results:

    • Chimpanzees produced acoustically distinct "rough grunts" for different foods.
    • Subjects used the information from playback grunts to successfully locate food.
    • This demonstrates that chimpanzee grunts are meaningful and understood by conspecifics.

    Conclusions:

    • Chimpanzee "rough grunts" are functionally referential signals.
    • This provides experimental evidence for referential vocal communication in great apes.
    • Findings support theories of vocal rather than gestural origins of language evolution.