Comparing the Effects of Sensory Tricks on Voice Symptoms in Patients With Laryngeal Dystonia and Essential Vocal Tremor.
Kaitlyn Dwenger, Nelson Roy, Skyler G Jennings and 4 others
PMID 40014398WHAT IT FOUND
Sensory tricks like vibrotactile stimulation and delayed auditory feedback did not improve voice symptoms in laryngeal dystonia.
Instead, listeners rated the voice quality as worse under these conditions. This contradicts the hypothesis that sensory tricks act as a beneficial diagnostic marker.
Key findings
01Listeners rated voice quality as significantly worse for the Laryngeal Dystonia group during both Delayed Auditory Feedback and Vibrotactile Stimulation compared to control conditions.
02Acoustic measures showed improved voice quality during Delayed Auditory Feedback but worsened quality during Vibrotactile Stimulation across all speaker groups.
03Participants with Essential Vocal Tremor also showed worsened perceived voice quality during Vibrotactile Stimulation, Delayed Auditory Feedback, and nasoendoscopy without anesthesia.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study was a pilot with only five participants per group, limiting statistical power and generalizability. The laryngeal dystonia group included only adductor-type dystonia, so findings do not apply to other subtypes. Five of the twelve listeners were excluded due to poor reliability, leaving only seven raters for the primary outcome. The vibrotactile device produced an acoustic artifact between 71 and 77 Hz that could not be filtered, which may have influenced listener ratings and acoustic measures. The vibrotactile stimulation rate used (70 Hz) differed from previous studies that reported benefits (100 Hz), making direct comparison difficult.
Declared interests
The project was funded by the National Institute on Deafness and Other Communication Disorders and the National Center for Advancing Translational Sciences. The vibrotactile device was a prototype developed by Passy Muir, Inc., but no financial conflicts of interest with this company were declared by the authors in the provided text.
The easy way to misread this
Do not interpret the worsened listener ratings for vibrotactile stimulation as proof that the intervention causes physiological worsening of dystonia. The study authors note that an unfiltered acoustic artifact from the device itself may have influenced the listeners' judgments, and the stimulation rate used (70 Hz) was lower than rates previously reported to improve symptoms.