Inclusion Criteria:  -  Persons post-stroke will be included in the study if they:  1) have either ischemic or hemorrhagic stroke at least six months since stroke onset; 2) demonstrate residual paresis in the lower extremity (Fugl-Mayer lower extremity score < 34) 3)are able to provide informed consent demonstrated by their ability to weigh the consequences of participating versus not participating in the study 4)can walk at least 10 feet with and without assistive device 5)have Berg Balance Scale <47.  Exclusion Criteria:  Potential participants will be excluded from the study if they: 1) have a pacemaker or other implanted device or have metal objects in the head; 2) have pre-existing neurological disorders, dementia or previous stroke; and 3) have severe arthritis or orthopedic problems that limit passive range of motion 4) have non-MR compatible implants or severe claustrophobia 5) have areas of recent bleeding or open wounds; or areas that lack normal sensation on the tongue 6) cancer treatment within the past year 7) nonremovable metal orthodontic devices 8) oral health problems 9) history of seizures 10) chronic infectious diseases 11) uncontrolled hypertension or diabetes 12) are pregnant.