Can targeted brain zaps ease movement problems in a rare ataxia?

This trial tests a non-invasive brain stimulation technique called transcranial temporal interference stimulation (tTIS) in people with spinocerebellar ataxia type 3, a genetic condition that affects coordination and balance. The stimulation targets a deep brain region involved in movement control, using personalized head models to guide electrode placement. The study aims to find the best stimulation dose that improves ataxia symptoms while minimizing risks like seizures or skin burns. Participants will receive tTIS over several days, and their symptoms will be measured using a standard ataxia rating scale.