Can a gentle zap to the brain help people with rare movement disorders?

This study tests whether a non-invasive brain stimulation technique called transcranial direct current stimulation (tDCS) can improve movement in people with degenerative ataxia, a rare disease that damages the part of the brain controlling balance and coordination. Sixteen adults with a confirmed diagnosis of cerebellar ataxia will receive either real or sham stimulation, and their walking, balance, and hand movements will be measured using both standard clinical scales and precise motion sensors. The goal is to see if this gentle brain stimulation can ease symptoms and improve quality of life.