The purpose of the study is to investigate the effects of a novel therapeutic approach to promote functional recovery and spasticity in chronic SCI. The tsDCS effect on neuro-physiological measures such as H reflex and somatosensory evoked potential (SSEP) wiil be evaluated in subjects with SCI. This incremental, design will allow the establishment of strong electrophysiological data prior to rapid clinical translation of the findings about this promising, early-stage technique.