Chorusing, synchrony, and the evolutionary functions of rhythm.

Area of Science:

• Biomusicology
• Evolutionary Biology
• Animal Behavior

Background:

• Understanding the biological basis of human musicality is a central goal in biomusicology.
• Comparative studies often focus on spectral properties, neglecting the temporal aspects of musicality.
• Rhythm research in animals has largely overlooked the influence of group dynamics on individual timing.

Purpose of the Study:

• To emphasize the importance of temporal properties in comparative studies of musicality.
• To explore the role of chorusing dynamics in shaping individual timing and its adaptive functions.
• To clarify mechanistic versus functional explanations in rhythm research and expand the range of taxa studied.

Main Methods:

• Comparative analysis of temporal properties in human and animal acoustic behavior.
• Development of a computational model to illustrate interdependence between individual and chorusing dynamics.
• Review of chorusing and rhythmic behaviors across diverse taxa (e.g., insects, amphibians, birds, primates).

Main Results:

• Temporal properties and chorusing dynamics are central to understanding rhythm across species.
• Group behavior significantly influences individual timing, mirroring dynamics in human music and dance.
• A distinction between mechanistic and functional explanations is crucial for evolutionary insights.

Conclusions:

• The "Evolving Signal Timing" hypothesis posits that timing similarities arise from comparable chorusing behaviors.
• Comparative studies of chorusing species offer insights into the evolution of rhythm in human ancestors.
• This research informs our understanding of the biology and evolution of rhythm in human music and language.