Clinical Research Directory

Inclusion Criteria: * Age 18 years or older. * History of TBI requiring inpatient rehabilitation, with resulting upper extremity impairment in at least one limb * Passive range of motion within functional limits at the wrists, shoulders, and elbows. * Able to attend on-site training at Craig Hospital three times per week for four weeks. * No complicating physical or cognitive condition, as determined by the physician or study investigator, that would preclude safe use of taVNS. * If taking prescribed antispasticity medication, dose stable for at least four weeks before study procedures. * Able to provide informed consent. Exclusion Criteria: * Recent fracture or contracture that could interfere with the intervention. * Botulinum toxin injections to the upper extremity or hand within the previous three months. * Pregnant, planning pregnancy, or breastfeeding. * Concurrent participation in another drug or device trial that may interfere with this study. * Implanted pacemaker, spinal cord stimulator, ventriculoperitoneal shunt, deep brain stimulator, or intrathecal pump. * Any condition or circumstance that, in the investigator's judgment, makes participation unsafe or inappropriate.