A total of 6 HD patients will be selected out of an existing larger HD patient cohort upon careful evaluation of the inclusion and exclusion criteria at month 0. Patients will be recruited if no significant cognitive deterioration is observed between month 0 and month 3. The preoperative clinical status will be evaluated twice including the United Huntington Disease Rating Scale (UHDRS), neuropsychological, neurophysiologic and neuroradiological assessments. At 4 weeks postoperatively an extensive evaluation of effects and side effects of every single contact of the bilateral quadripolar electrodes takes place.