Brain Stimulation Enhance Post-stroke Walking Survivors and Healthy Adults

"Stroke participants will be randomly assigned into one of three groups: anodal transcranial direct current stimulation (a-tDCS), sham tDCS (s-tDCS), or control groups (i.e. no brain stimulation). Young and older healthy adults will be randomly assignments into a-tDCS or s-tDCS groups.~Stroke participants in each group will receive a four-week of the assigned brain stimulation combined with visuomotor stepping training and treadmill training"