Dystonia is increasingly being considered as a multi-nodal network disorder involving both basal ganglia and cerebellar dysfunction. The aim of this study is to determine if "Multi-Target" Thalamic and Pallidal Deep Brain Stimulation improves hemi-dystonia patients who are receiving inadequate therapy from GPi DBS.

Inclusion Criteria:

1. Diagnosed with hemi-dystonia secondary to stroke
2. Candidate for GPi DBS
3. Able to provide informed consent

Exclusion Criteria:

1. History of intracranial pathology (such as multiple sclerosis, tumors, or aneurysms) that may account for dystonia or essential tremor.
2. History or evidence of ongoing psychiatric or neurodegenerative disorders (such as Parkinson's disease, Alzheimer's disease).
3. Incompetent adults or those unable to communicate.