Vocal Instabilities in Untrained Female Singers.
Michelle M Bretl, Ronald C Scherer
PMID 39779406WHAT IT FOUND
Untrained singers can produce smooth scales, but objective signals reveal hidden instabilities like pitch overshoots and airflow changes that the ear misses.
Voice breaks and sudden intensity drops were the only signs always heard, marking the most unsteady performances.
Key findings
01Aphonic segments (voice breaks) and abrupt intensity changes greater than 10 dB were present only in scales classified as unsteady.
02Objective measures like fundamental frequency rate of change and airflow detected instabilities in scales that sounded smooth to the investigators.
03Smooth scales had fewer measurable instabilities than unsteady ones, but there was overlap in the total count of issues found.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The sample size was extremely small, with only five participants. The participants were all young adult cisgender women, so findings may not apply to men, adolescents, or other gender identities. The definition of 'untrained' allowed for choral experience, which varies in vocal technique. Instability thresholds were arbitrary and not validated against a larger population. The study did not include patients with diagnosed voice disorders, only healthy untrained singers.
Declared interests
The authors declared no conflicts of interest and no financial or non-financial relationships to disclose.
The easy way to misread this
Do not use the specific instability thresholds (e.g., 10 dB intensity change, 375 Hz/s pitch overshoot) as diagnostic criteria for voice disorders. These values were derived from five healthy untrained singers and are not validated for clinical diagnosis.