Brain zaps + speech therapy: new hope for stuttering?
NCT ID NCT07222163
First seen Jun 27, 2026 · Last updated Sep 03, 2026 · Updated 2 times
Summary
This study tests whether a gentle brain stimulation technique (tDCS) combined with standard speech therapy can reduce stuttering severity and its negative impact on daily life. Sixteen adults who stutter will receive both treatments, and researchers will measure changes in speech fluency, anxiety, and brain activity. The goal is to gather early evidence for a possible new treatment approach.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 16 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Sep 2025
- Expected to finish
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Dec 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. Adults aged 18 to 65 years. 2. Diagnosis of developmental stuttering, verified by a licensed speech-language pathologist. 3. Mild-to-moderate or greater stuttering severity, defined as a score of 20 or higher on the Stuttering Severity Instrument-Fourth Edition (SSI-4). 4. English as a primary language. 5. Right-handedness (to minimize variability in neural lateralization). 6. Willing and able to attend all study sessions and follow study procedures. Exclusion Criteria: 1. Have a history of neurological, psychiatric, or medical conditions that are contraindicated for tDCS. 2. Are currently taking medications known to affect cortical excitability. 3. Have a history of seizures or epilepsy. 4. Are pregnant or planning to become pregnant during the study period. 5. Have metal implants in the head (excluding dental work) or other contraindications to electrical brain stimulation. 6. Any skin disorder or skin sensitive area near stimulation locations.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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NYU Langone Health
RECRUITINGNew York, New York, 10016, United States
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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- Brain scans and speech tasks aim to unlock the secrets of stuttering
- Sound waves aim to ease stuttering in early trial
- Brain zaps aim to smooth stuttering speech
- Magic mushroom compound could help people who stutter
- Can rhythm tasks unlock secrets of childhood stuttering?