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