Optimal Therapeutic Dose of tDCS for Functional Upper Limb Recovery in People With Stroke

tDCS is a type of non-invasive brain stimulation that in a standard paradigm, low intensity current (1-2 mA) is applied continuously through a battery connected to two 20 to 35 cm2 surface electrodes located on the scalp: an anode and a cathode. In the interhemispheric competition model, tDCS can serve as a means to increase ipsilesional cortical excitability through anodal stimulation, to decrease contralesional cortical excitability through cathodal stimulation, or to do both through a montage of bi-hemispheric electrodes.