This research is being done to find out if brain stimulation combined with a rehabilitation therapy improves arm weakness as a result of having a stroke. The stimulation technique is called transcranial direct current stimulation (tDCS). The treatment uses direct electrical currents to stimulate specific parts of the brain. The rehabilitation therapy is called "modified Constraint Induced Movement Therapy" (mCIMT). During this rehabilitation therapy study participants will wear a mitt on the hand of the arm that was not affected by their stroke. It is designed to restrain the use of the unaffected arm, while performing therapy with impaired one.
It is not known if brain stimulation combined with rehabilitation therapy will improve arm weakness. Study participants will receive rehabilitation therapy while on this study. Study participants may or may not receive the brain stimulation therapy.

We plan to obtain skin biopsies from patients with systemic sclerosis and healthy donors to grow cells from biopsies. With those cells, we will use them in experiments to see why the cells from systemic sclerosis patients have more fibrosis compared to patients without systemic sclerosis.

Transcranial direct current stimulation (tDCS) can be an effective therapy for stroke recovery patients. However, the extent to which patients show improvements with tDCS is highly variable. This variability may arise due to the differences of stroke location in the brain and because of differences in brain damage, all of which may differ between patients. If the relationship between these factors and tDCS efficacy were known, recovery from stroke using tDCS might become more predictable. Our overall objective is to understand potential measures of tDCS efficacy that may someday allow for optimization of clinical outcomes and patient care.