Transcranial Alternating Current Stimulation (tACS) in Stuttering
NCT ID: NCT06740968
Last Updated: 2025-09-12
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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RECRUITING
NA
80 participants
INTERVENTIONAL
2025-08-05
2029-12-31
Brief Summary
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The study team hypothesizes that if stuttering involves impaired initiation of motor programs, delta-tuned tACS will strengthen communication between brain regions and decrease stuttering. Therefore, delta-tuned sensorimotor tACS will be paired with fluency-induced speech (choral reading), which is hypothesized to decrease stuttering via improved auditory motor integration.
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Detailed Description
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Of note, there will be an embedded pilot study to refine the experimental protocol in terms of practicality and feasibility and these participants will not be included in this registration. The only purpose of this embedded study is to refine the protocol and it does not have any health or behavioral outcomes.
Conditions
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Study Design
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RANDOMIZED
SINGLE_GROUP
BASIC_SCIENCE
NONE
Study Groups
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transcranial alternating current stimulation (tACS)
Participants will receive 3 sessions of tACS. Each session can be active or sham. The stimulation parameters regarding the active and sham will not be disclosed at this time to maintain blind to participants. At the end of the trial the study will be updated to list these.
transcranial alternating current stimulation (tACS)
During each of the 3 stimulation visits, participants will be seated in a comfortable position and a cap will be placed on participant's head similar to a swimming cap. Small electrodes will be placed near the surface of the scalp at certain regions of interest, and a weak electrical current will be passed through the electrodes into speech related brain areas for 20 minutes. The study team will not use current strengths exceeding 2 milliamps (mA).
Interventions
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transcranial alternating current stimulation (tACS)
During each of the 3 stimulation visits, participants will be seated in a comfortable position and a cap will be placed on participant's head similar to a swimming cap. Small electrodes will be placed near the surface of the scalp at certain regions of interest, and a weak electrical current will be passed through the electrodes into speech related brain areas for 20 minutes. The study team will not use current strengths exceeding 2 milliamps (mA).
Eligibility Criteria
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Inclusion Criteria
* Speak English as the primary language
* Currently stutter
* Score (per protocol) a certain value on the Stuttering Severity Instrument (SSI-4).
* Have not received any treatment for stuttering within the past year
Exclusion Criteria
* Major medical or neurological illness (e.g., stroke, serious head trauma, brain infection, Parkinson's disease, etc.)
* History of closed head injury with loss of consciousness (e.g., concussion)
* Metal or electronic implants such as cochlear implants and pacemakers anywhere in the body
* Braids or other hair styling that prevents direct access to the scalp (if removal not possible)
* Currently pregnant
18 Years
65 Years
ALL
No
Sponsors
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University of Michigan
OTHER
Responsible Party
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Soo-Eun Chang
Associate Professor of Psychiatry
Principal Investigators
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Soo-Eun Chang, PhD
Role: PRINCIPAL_INVESTIGATOR
University of Michigan
Locations
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University of Michigan
Ann Arbor, Michigan, United States
Countries
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Central Contacts
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Facility Contacts
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Other Identifiers
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HUM00211167
Identifier Type: -
Identifier Source: org_study_id
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