1. Males and non-pregnant females who are between 18 to 75 years of age 2. Diagnosed with traumatic or (incident-related) non-traumatic chronic cervical incomplete SCI (AIS B-D), 12 to 30 months from event. 3. Individuals with a score between 5 - 35 on the GRASSP strength subscore on at least one side 4. Medically stable 5. Cognitive status and ability to communicate must be at a level consistent with that which is required to participate in motor rehabilitation regimen (e.g. can follow directions and cued tasks) 6. Stable pharmacological treatment plan without any planned modifications 7. Able to engage in physical therapy program as stipulated per protocol 8. Passive shoulder flexion of at least 60 degrees and passive shoulder abduction of at least 40 degrees, to ensure ability to perform upper limb motor tasks 9. Negative pregnancy test in women of childbearing potential 10. Subject can independently provide consent (written or verbal in the presence of a family member) to participate in the study and is willing to comply with study procedures

Subjects not eligible for this study include those that have any of the following: 1. Excessive pain in the UE that limits the administration of the evaluation measurements 2. Excessive spasticity: subjects with MAS of wrist ≥ 2, or MAS of elbow ≥ 3 3. Received botulinum toxin in the previous 4 months, or planning of an upcoming injection during the trial period 4. Participating in any other experimental rehabilitation or drug studies 5. Medical conditions or circumstances that, in the opinion of the investigators, would preclude safe and/or effective participation 6. Severe cognitive or psychiatric problems that might significantly impact the successful study conduct 7. History of epileptic seizures or epilepsy 8. Implanted electronic medical devices 9. Alcoholism or drug addiction as defined by DSM-IV within last 5 years