Effects of False Vocal Folds on Intraglottal Velocity Fields.

The work was done on larynges removed from dead dogs, not on living people, so the findings describe a mechanical model rather than a functioning human voice. The air pressures used were higher than the range typical of human speech, and the authors state the results are only likely to carry over to humans because they fall within a specific pressure window. The false vocal folds were rigid metal inserts, not living tissue, so the study cannot capture how real folds move, tense, or respond. The vocal tract was a straight acrylic tube, not a real mouth and throat, so natural acoustic loading was absent. The airflow was measured in one thin slice through the middle of the folds, so it assumes that slice represents the whole three-dimensional flow. The sound was measured at a distance that does not follow the standard protocol for human intensity measurement, because there was no real head or mouth. Vortex strength was traced by hand on selected frames rather than measured automatically across the whole cycle.

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Do not read this as evidence that a supraglottal narrowing technique makes a voice louder or healthier. The study measured airflow and sound in four excised canine larynges with rigid metal inserts standing in for the false folds, at pressures higher than human speech, and it tested no treatment and no patients.