Evidence map›Paper›PMID 18396999›Full record

ArticleThe Journal of the Acoustical Society of America2008

Nonlinear source-filter coupling in phonation: vocal exercises.

Ingo Titze, Tobias Riede, Peter Popolo

Open access · bronzeAbstract read
In one paragraph

Article in The Journal of the Acoustical Society of America, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 60 papers.

0numbers the graph read from it
0cells of the map it votes in
60citing papers in PubMed
9.7field-weighted citation impact, top 2% of its field
1 · What the graph read from it

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

60 citing papers in PubMed, 191 citations in OpenAlex.

  1. Review
  2. Article
  3. Microevolutionary divergence and plasticity of laryngeal shape in the house mouse (American journal of physiology. Regulatory, integrative and comparative physiology · 2025
    Article
  4. Article
  5. Article
  6. Exploring nonlinear phenomena in animal vocalizations through oscillator theory.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  7. Application of nonlinear dynamics theory to understanding normal and pathologic voices in humans.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  8. Vocal registers expand signal diversity in vertebrate vocal communication.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  9. Article
  10. Article
  11. Continuous-Time Model Identification of the Subglottal System.Biomedical signal processing and control · 2024
    Article
  12. Article
  13. Anatomy and mechanisms of vocal production in harvest mice.The Journal of experimental biology · 2024
    Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 2 institutions in 1 country.

Ingo TitzeNational Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado, USA. ingo-titze@uiowa.edu
Tobias Riede
Peter Popolo
Denver Center for the Performing Arts · USUniversity of Iowa · US

Funding

RESEARCH TOWARD OCCUPATIONAL SAFETY IN VOCALIZATIONR01DC004224 · NIDCD · UNIVERSITY OF UTAH · PI TITZE, INGO R · 2000 to 2009
$6.0M
NIDCD NIH HHS 5R01 DC004224-08NIDCD NIH HHS R01 DC004224
6 · The paper itself

Abstract

Nonlinear source-filter coupling has been demonstrated in computer simulations, in excised larynx experiments, and in physical models, but not in a consistent and unequivocal way in natural human phonations. Eighteen subjects (nine adult males and nine adult females) performed three vocal exercises that represented a combination of various fundamental frequency and formant glides. The goal of this study was to pinpoint the proportion of source instabilities that are due to nonlinear source-tract coupling. It was hypothesized that vocal fold vibration is maximally destabilized when F(0) crosses F(1), where the acoustic load changes dramatically. A companion paper provides the theoretical underpinnings. Expected manifestations of a source-filter interaction were sudden frequency jumps, subharmonic generation, or chaotic vocal fold vibrations that coincide with F(0)-F(1) crossovers. Results indicated that the bifurcations occur more often in phonations with F(0)-F(1) crossovers, suggesting that nonlinear source-filter coupling is partly responsible for source instabilities. Furthermore it was observed that male subjects show more bifurcations in phonations with F(0)-F(1) crossovers, presumably because in normal speech they are less likely to encounter these crossovers as much as females and hence have less practice in suppressing unwanted instabilities.

Indexed as

AdultFemaleHumansMaleMiddle AgedPhonationVibrationVocal Cords

Identifiers

PMID18396999
PMCPMC2677316
OpenAlexW2026952173

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.