Participants with a history of acquired brain injury and distal upper limb motor impairments will receive a single two-hour session of SES using transcutaneous electrical nerve stimulation. Pre- and post-intervention assessments consist of the Action Research Arm Test (ARAT), finger fractionation, pinch force, and the modified Ashworth scale (MAS), along with resting-state EEG monitoring. We will assess for any association between SES and changes in motor outcome as measured using the ARAT, MAS and finger fractionation. In addition, EEG power analyses will be performed to determine if there are any differences between SES responders vs. non-responders.