---
title: Improve speech volume with amplification
nct_id: NCT07599696
phase: NA
status: RECRUITING
sponsor: Michigan State University
study_type: INTERVENTIONAL
canonical_url: "https://parkinsonspathways.com/trial/NCT07599696"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT07599696"
last_fetched: "2026-05-20T14:00:19.502Z"
source: "Parkinson's Pathways (curated)"
---
# Improve speech volume with amplification

**Goal (in five words):** Improve speech volume with amplification

**Official Title:** Speech Amplification Devices for Parkinson and Related Diseases: Talker- and Technology-Driven Enhancements

**Trial ID:** [NCT07599696](https://clinicaltrials.gov/study/NCT07599696)

## Key Facts

- **Phase:** NA
- **Status:** RECRUITING
- **Study Type:** INTERVENTIONAL
- **Sponsor:** Michigan State University
- **Target Enrollment:** 100 participants
- **Start Date:** 2024-03-01
- **Completion Date:** 2027-12-31
- **Conditions:** Parkinson Disease, Atypical Parkinsonism
- **Interventions:** Behavioral speech strategies + speech amplification
- **Intervention Types:** BEHAVIORAL

## Summary For Families

The goal is to help people with Parkinson's and related parkinsonism speak louder and more clearly so conversations and daily communication feel easier. The approach uses behavioral speech coaching to increase vocal loudness and clarity, paired with a small portable amplification device that boosts the speaker's voice, and because it is non-drug it does not interfere with medications like levodopa. The amplifier makes your voice easier for others to hear while the coaching helps you use your voice more effectively. The study is looking for native North American English speakers age 50 and up with a neurologist diagnosis of Parkinson disease or atypical parkinsonism who have noticeable speech or voice changes, and it excludes people with other speech/neurological conditions or significant uncorrected hearing loss or cochlear implants.

## Eligibility

- **Minimum age:** 50 Years
- **Sex:** ALL

### Full Criteria

```
Inclusion Criteria:

* Dominant speakers of North American English
* Have received a neurologist's diagnosis of Parkinson disease or parkinsonism (e.g., PSP/MSA/PSP)
* Present with changes in their speech/voice

Exclusion Criteria:

* History of any other speech, language, or neurological concern other than Parkinson/parkinsonism.
* Uncorrected hearing loss that exceeds a threshold of 40 dB HL in more than one ear (as per baseline screening audiometry) and/or use of a cochlear implant.
```

## Locations (1)

- Michigan State University, East Lansing, Michigan, United States _(42.7370, -84.4839)_
  - Thea Knowles, PhD — (CONTACT) — 517-353-6401 — thea@msu.edu
  - Thea Knowles, PhD — (PRINCIPAL_INVESTIGATOR)

## Central Contacts

- Thea Knowles, PhD — (CONTACT) — 517-353-6401 — thea@msu.edu

---

*Canonical: https://parkinsonspathways.com/trial/NCT07599696*  
*HTML version: https://parkinsonspathways.com/trial/NCT07599696*  
*Source data: https://clinicaltrials.gov/study/NCT07599696*