Following stroke, communication between brain areas and to the lower limbs can be compromised, leading to impairments in walking ability. Paired associative stimulation (PAS), a method of non-invasive brain stimulation, is thought to be a useful tool in understanding the relationship between different parts of the brain, and functional ability. However, PAS protocols have not been optimized for use post-stroke. The purpose of this research study is to determine the reliability and effectiveness PAS. This study involve individuals >6 months after having a stroke.