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Great apes may use iconic gestures, showing a perceived link between gesture form and meaning. This challenges traditional theories and suggests a precursor to human language evolution.

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Area of Science:

  • Cognitive Science
  • Linguistics
  • Primatology

Background:

  • Iconicity, the resemblance between signal form and meaning, is increasingly recognized as crucial for language processing, learning, and evolution.
  • Apes exhibit a wide range of gestures, many of which appear to be iconic representations of actions.

Purpose of the Study:

  • To investigate whether great apes utilize iconic gestures, exploring their role in communication and language origins.
  • To challenge traditional theories of gesture development (ontogenetic and phylogenetic ritualization) that dismiss the psychological reality of iconicity in ape gestures.

Main Methods:

  • Review and analysis of existing research on ape gestural repertoires and cognitive theories of human iconicity.
  • Comparison of ape gestures with human iconic gestures, considering sensorimotor simulation and mental imagery frameworks.

Main Results:

  • Ape gestures, including directive touches, visual directives, and pantomimed actions, often display form-meaning resemblance.
  • Existing theories struggle to explain the variability and contextual flexibility observed in ape gestures.
  • Ape iconic gesturing may be homologous to human iconic gestures, albeit with a more restricted scope and context-dependency.

Conclusions:

  • Great apes likely use iconic gestures, suggesting that the capacity for iconicity is not exclusive to humans.
  • This fundamental ability for iconic gesturing in apes may represent a critical evolutionary precursor to the development of human language.