Elucidating the Temporality of Structural and Functional Connectivity Changes in Essential Tremor After Successful Deep Brain Stimulation to the Dentato-rubro-thalamic Tract

Inclusion Criteria: * the diagnosis of Essential Tremor, made by a movement disorder neurologist, where tremor is not secondary to any disease process or traumatic insult * distal appendicular tremor, with minimal proximal component * tremor refractory to multiple medication regimens and/or where the medications cause intolerable side effects * tremor judged to be severely impacting their quality of life. Exclusion Criteria: * significant neurological disorder * significant dementia or neurocognitive limitations as assessed by neuropsychiatry (when necessary) * severe psychiatric illness wi…