ReviewPhilosophical transactions of the Royal Society of London. Series B, Biological sciences2025
Biphonation in animal vocalizations: insights into communicative functions and production mechanisms.
Review in Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
8 citing papers in PubMed.
- Acoustic Features and Recognition of Distress Calls inBiology · 2026Article
- Animals as Communication Partners: Ethics and Challenges in Interspecies Language Research.Animals : an open access journal from MDPI · 2026Review
- Article
- Nonlinear phenomena in mammalian vocal communication: an introduction and scoping review.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Article
- How to analyse and manipulate nonlinear phenomena in voice recordings.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Review
- Transitions and tricks: nonlinear phenomena in the avian voice.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Review
- Exploring nonlinear phenomena in animal vocalizations through oscillator theory.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Review
- Nonlinear phenomena in vertebrate vocalizations: mechanisms and communicative functions.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
Abstract
Biphonation, defined as the simultaneous production of two distinct, non-harmonically related fundamental frequencies, has traditionally been viewed as an anomaly or a by-product of vocal pathology. Recent studies have challenged this assumption and found that biphonic calls are present in the natural vocalizations of a wide range of taxa, including birds, amphibians and mammals. This phenomenon could play an essential role in communicating distinct pieces of information at short- versus long-distance, increase call complexity to allow more individually distinct calls, and provide cues to the sender's direction of movement. Proposed mechanisms underlying biphonation production include asymmetries in vocal fold oscillations, the addition of aerodynamic whistles, the involvement of secondary structures, and bilateral specializations. This scoping review underscores the adaptive significance of biphonic calls in non-human animals, highlighting their role in the evolution of vocal communication and suggesting avenues for future research.This article is part of the theme issue 'Nonlinear phenomena in vertebrate vocalizations: mechanisms and communicative functions'.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.