Mapping Mood in the Subthalamic Nucleus in Parkinson's Disease (PD)

Inclusion Criteria for STN-DBS subjects: * Age 40 or older * DBS STN Surgery in past 2 to 36 months * Ability to tolerate turning off Stimulators * Ability to read and comprehend questions * English speaking Exclusion Criteria for STN-DBS subjects: * Other severe complications post surgery: stroke, seizure, major loss of consciousness, other brain trauma/surgery, or head injuries(i.e. near drowning), encephalitis, or hydrocephalus, blindness, deafness * Clinically determined Dementia ( Most recent MMSE score of \>24) Inclusion Criteria for Control subject: * Age 40 or older * Ability to read and comprehend questions * English speaking Exclusion Criteria for Control subject: * Other severe complications post surgery: stroke, seizure, major loss of consciousness, other brain trauma/surgery, or head injuries(i.e. near drowning), encephalitis, or hydrocephalus, blindness, deafness * Clinically determined Dementia ( Most recent MMSE score of \>24) * Plans to have DBS STN surgery in the next 24 months