Impact of Sensory Electrical Stimulation on Sensation and Tremor

Inclusion Criteria for Healthy Participants: * Age from 18 to 80 years, inclusive * No history of a brain and/or skull lesion * Normal hearing and (corrected) vision * Able to understand and give informed consent * No neurological disorders * No tremor * Able to understand and speak English Exclusion Criteria for Healthy Participants: * History of significant head trauma (i.e., extended loss of consciousness, neurological damage) * Known structural brain lesion * Prior neurosurgical procedures * Tremors (as determined by study team) * Co-existence of other neurological diseases * Parkinsonism * Medical (e.g., cardiological, renal, hepatic, oncological) or psychiatric disease that would interfere with study procedures * Pathology that could cause abnormal movements of extremities (e.g., epilepsy, stroke, marked arthritis, etc.) * Inability to perform study tasks or assessments (e.g., follow instructions to stay still during asES procedures) or unable/unwilling to complete study forms * Non-prescribed drug use or recreational marijuana use * History of current substance abuse (exception: current nicotine use is allowed) * Pregnancy * Prisoners Inclusion Criteria for ET Patients: * Age from 18 to 80 years, inclusive * No prior history of skull lesions or craniotomy * Normal hearing and (corrected) vision * Able to understand and give informed consent * Diagnosis of ET (Tremor Research investigation Group criteria) by a physician * At least moderate-severe tremor (based on t…