This study is investigating the usefulness of using functional magnetic resonance imaging (fMRI) to monitor brain activation during deep brain stimulation for Parkinson's Disease, Essential tremor, dystonia, OCD, depression, pain, Tourette's syndrome, and epilepsy. The study may determine the relationship between patterns of brain activation and therapeutic outcome and/or side effects.
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Mean Score on Unified Parkinson's Disease Rating Scale (UPDRS)
Timeframe: 6 months after Deep Brain Stimulation