Brain Stimulation for Stuttering

This trial aims to determine if a type of noninvasive brain stimulation, called High-Definition Transcranial Direct Current Stimulation, can help people who stutter by reducing speech errors such as repetitions, blocks, and prolongations. Researchers are testing two different brain areas to identify which one might improve speech fluency. Participants will engage in a series of tasks before and after the brain stimulation. Suitable candidates for this trial include those diagnosed with developmental stuttering who speak English as their primary language and can visit the clinic in person. As an unphased trial, this study offers a unique opportunity to contribute to pioneering research that could lead to new treatments for stuttering.

The trial protocol does not specify if you need to stop taking your current medications. However, your medical history and current medication use will be assessed to ensure there are no conflicts with the study.

Research has shown that High-Definition Transcranial Direct Current Stimulation (HD-tDCS) is generally safe. This method places sensors on the head to send a small electrical current to specific brain areas. Studies have found that HD-tDCS is well-tolerated and does not negatively impact well-being.

For the presupplementary motor area, which aids in speech and movement planning, research consistently shows that HD-tDCS is safe. Participants might experience slight dizziness when the stimulation starts, but it is brief and does not affect balance.

When targeting the left inferior frontal gyrus, crucial for speech production, studies have found similar safety results. Known as Broca's area, using HD-tDCS here can improve speech fluency without causing harm.

Researchers are excited about high-definition transcranial direct current stimulation (HD-tDCS) for stuttering because it offers a non-invasive and direct way to target specific brain regions involved in speech production. Unlike traditional therapies such as speech therapy and pharmacological treatments that often have longer timelines for seeing results, HD-tDCS can potentially produce changes more rapidly by directly stimulating the brain areas critical for speech. This trial is testing two specific brain areas: the presupplementary motor area, which is involved in motor planning, and the left inferior frontal gyrus, also known as Broca's area, which is crucial for speech production. By directly targeting these areas, researchers hope to reduce speech errors and make speaking easier for people who stutter.

Research has shown that a technique called HD-tDCS (High-Definition Transcranial Direct Current Stimulation) might help people who stutter. In this trial, participants will receive HD-tDCS targeting different brain areas. One arm of the trial focuses on the presupplementary motor area, a brain region involved in planning movements, which may improve speech fluency. Another arm targets the left inferior frontal gyrus, also known as Broca's area, which is important for speech production and may help adults who stutter speak more fluently. These findings suggest that focusing on certain brain parts with HD-tDCS could reduce speech issues like repeating words or getting stuck. While the results are promising, more research is needed to fully understand its effectiveness for stuttering.³⁵⁶⁷⁸