Usability and feasibility of in-home vibro-tactile stimulation for treating voice symptoms in laryngeal dystonia

Abstract

Laryngeal dystonia (LD) is a chronic neurological voice disorder treated primarily with Botulinum neurotoxin (BoNT) injections. Recent studies suggest that laryngeal vibrotactile stimulation (VTS) may reduce vocal effort and improve voice quality. This study evaluated the feasibility and usability of an in-home VTS device in 32 participants with adductor or abductor LD over eight weeks. Participants applied VTS for 20 minutes/day, initially following a fixed protocol, then self-regulating usage. Results showed high adherence (93%) and user satisfaction (75% reported no difficulty). VTS reduced perceived speech effort by 13.5% during the first four weeks, and 63% of participants reported improvements. Voice quality ratings increased from neutral (2.9) to noticeable (3.8), with effects lasting beyond 24 hours for some. No significant differences were observed between LD types or BoNT use. Most participants preferred the collar over skin tape. Findings support VTS as a feasible, non-invasive, and patient-accepted in-home intervention for LD.