tVNS During Motor Training in Older Adults

Inclusion Criteria: * 65-84 years old across all races, genders, and ethnicities. * Physically and cognitively healthy Exclusion Criteria: * Younger than 65 years old or older than 84 years old * Current or history of cardiac disease * Have an implanted device such as a neurostimulator or cochlear implant * Current or history of tympanic membrane perforation * Have a musculoskeletal issue that prevents hand function (e.g., arthritis) * Have a vision problem not corrected by glasses or contact lenses * Uncorrected auditory impairments * Had a stroke or lesion (including tumor) in the brain * Had a head injury or brain surgery * Suffer from frequent or severe headaches * Had a fainting spell or syncope * Have any metal in the head such as shrapnel, surgical clips, or fragments from welding or metal work * Have any implanted device such as cardiac pacemakers, medical pumps, or intracardiac lines * Had any brain-related conditions (i.e. multiple sclerosis, Parkinson, Alzheimer) * Had any illness that caused brain injury (i.e. meningitis, aneurysm, brain tumor) * Had any head trauma that was associated with a loss of consciousness or diagnosed as a concussion * Being treated for any psychiatric condition (i.e. depression, anxiety, PTSD, schizophrenia) * Suspected of pregnancy * Pregnant * Cognitive status issues as confirmed with the Mini-Mental State Exam (MMSE \<26) * Musculoskeletal condition or injury that would limit hand range of motion