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Isochrony and rhythmic interaction in ape duetting.

Teresa Raimondi1, Giovanni Di Panfilo1, Matteo Pasquali1

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Summary

Lar gibbons exhibit isochrony, a core human musical rhythm, in their songs. Their rhythmic flexibility and synchrony in duets suggest shared evolutionary pressures for vocal displays in singing primates.

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Area of Science:

  • Biomusicology
  • Primate Vocalizations
  • Evolutionary Biology

Background:

  • Isochrony (regular note onsets) and synchrony (coordinated timing) are human musical universals.
  • Biomusicology investigates musical trait evolution across species.
  • The origin of rhythm in humans and other species remains an open question.

Purpose of the Study:

  • To investigate the presence and interplay of isochrony and synchrony in a non-human primate.
  • To explore the evolutionary roots of musical rhythm in singing primates.

Main Methods:

  • Analysis of temporal features in lar gibbon (Hylobates lar) solo and duet songs.
  • Statistical analysis to identify rhythmic interactions and causality.
  • Examination of isochrony and synchrony in relation to call rate and social context.

Main Results:

  • Lar gibbons exhibit isochrony, a key human musical trait.
  • Increased call rate correlates with enhanced isochrony, suggesting physiological influences.
  • Isochrony is context-dependent, with greater precision during duets.
  • Evidence of statistical causality and synchrony in gibbon duets.
  • A sex-specific trade-off exists between individual isochrony and synchrony.

Conclusions:

  • Gibbon vocalizations demonstrate plasticity in isochrony and rhythmic interaction, mirroring human musicality.
  • Shared selective pressures for interactive vocal displays may have shaped primate musicality.
  • Singing primates offer valuable models for understanding the evolution of rhythm and music.