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On reappearance and complexity in musical calling.

David M Schruth1, Christopher N Templeton2, Darryl J Holman1

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Researchers developed a new acoustic measure, the acoustic reappearance diversity index (ARDI), to quantify musicality in primate vocalizations. This index reveals that musical calls are linked to social monogamy and specific habitats, offering insights into the evolution of music.

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Area of Science:

  • Bioacoustics
  • Evolutionary Biology
  • Primatology

Background:

  • Music is a significant human trait, with precursors potentially present in primate vocalizations.
  • Defining and quantifying 'musicality' across species has been a major challenge in evolutionary studies.
  • Previous research lacked a standardized method to analyze acoustic features indicative of musicality in non-human primates.

Purpose of the Study:

  • To propose a novel, acoustics-focused definition of musicality applicable across species.
  • To develop a quantitative index for measuring musical patterning in primate vocalizations.
  • To investigate the ecological and social factors influencing the evolution of musicality in primates.

Main Methods:

  • Analysis of 832 primate vocalizations using spectrographic images.
  • Development of the acoustic reappearance diversity index (ARDI) based on six structural features of human music.
  • Principal components analysis to reduce multivariate acoustic data into a concise measure of musical patterning.

Main Results:

  • The ARDI effectively quantifies musical complexity in primate vocalizations, correlating with established measures in birdsong.
  • Musical vocalizations showed a moderate association with wooded habitats and arboreal foraging (acoustic adaptation hypothesis).
  • Musical calling was most strongly linked to social monogamy, suggesting selection pressures within small social groups.

Conclusions:

  • The ARDI provides a continuous measure of musical behavior, enabling the study of non-human musicality.
  • Evolutionary pathways for musicality can be gradualistic, influenced by social and environmental factors.
  • Social monogamy appears to be a significant driver for the evolution of musicality in primate vocal communication.