Voice Type Component Profile Model of Glottal Gap Voice in Ex Vivo Canine Larynges.
Owen P Wischhoff, Katerina A Smereka, Colbey Johnson and 4 others
PMID 39443249WHAT IT FOUND
In excised dog larynges, gaps wider than 1.5 mm sharply reduced periodic voice signals and increased chaotic ones.
This suggests a threshold where small gaps stop being harmless, but the ex vivo model limits direct clinical application.
Key findings
01Voice type 1 (periodic) components significantly decreased as the induced glottal gap widened, with a notable drop occurring between 1.5 mm and 2.0 mm shim widths.
02Voice type 4 (chaotic/turbulent) components significantly increased with larger gaps, showing a binary-like shift where widths of 2.0 mm and above produced higher VTC4 profiles compared to smaller gaps.
03The study used an ex vivo canine model, which cannot replicate living muscle function or patient variability, limiting its direct use for diagnosing human voice disorders.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used excised canine larynges, which lack living muscle tone and neural control, potentially skewing baseline acoustic profiles (e.g., high Type 3 in controls). Canine laryngeal anatomy differs from human anatomy, limiting direct translation of gap sizes. No human participants were involved, so individual compensatory mechanisms or perceptual outcomes could not be assessed. Videostroboscopy was not performed, so the visual correlation between the induced gap and actual vocal fold vibration was not captured.
The easy way to misread this
Do not apply these specific millimeter thresholds to human patients. The gap sizes were mechanically induced in dead tissue without muscle tone, which behaves differently from a living human larynx where compensatory tension and anatomy play a major role.