Study procedures:
Subjects will complete the following three surveys on two occasions i.e. at baseline, hours or days before thalamotomy, and again 12 months after the procedure (with a window of 11 to 18 months). Completing the three surveys takes approximately 5 minutes.
1. The ET-stigma distress scale which has 11 items each with 5 response options ranging from "strongly disagree" to "strongly agree"
2. the ET stigma dysfunction scale which has 5 items each with 3 response options ranging from "not at all or rarely" to "frequently"
3. the Tremor Disability Scale-Revised with 20 items each with 4 response options ranging from "no difficulty" to "cannot perform the task".
