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Temporal regularities of vocal exchange in Java sparrows.

Sota Kikuchi¹, Noriko Kondo¹, Hiroki Koda¹

¹Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Tokyo, Japan.

|July 23, 2025

Summary

Java sparrows exhibit rapid vocal turn-taking, similar to humans and mammals. However, unlike mammals, their intra-individual call intervals did not differ significantly from inter-individual intervals.

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Area of Science:

Ethology
Bioacoustics
Animal Communication

Background:

Human turn-taking involves rapid vocal alternations with minimal overlap.
Temporal regularity in vocal exchanges is documented in social mammals but less so in birds, especially regarding call-based interactions.
Intra-individual intervals in human vocal exchanges are typically longer than inter-individual intervals.

Purpose of the Study:

To investigate the temporal patterns of vocal exchanges in Java sparrows.
To compare intra-individual and inter-individual call intervals in this avian species.
To explore potential differences in vocal exchange timing between birds and mammals.

Main Methods:

Observing face-to-face vocal exchanges between pairs of Java sparrows.
Analyzing the temporal intervals between successive vocalizations.
Comparing inter-individual (between different birds) and intra-individual (within the same bird) call intervals.

Main Results:

Java sparrows engaged in vocal exchanges with very short intervals following the partner's call.
No significant difference was found between inter-individual and intra-individual call intervals in Java sparrows.
This finding contrasts with temporal patterns observed in social mammals.

Conclusions:

Java sparrow vocal exchanges display unique temporal characteristics compared to social mammals.
The observed differences may be attributed to variations in social group structures between avian and mammalian species.
Further research is needed to fully understand the nuances of avian call-based vocal exchanges.