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  • Schlaug G, Renga V. (2008). Transcranial direct current stimulation: a non invasive tool to facilitate stroke recovery. Expert Rev Med Devices. 5(6):759-68
    This figure shows a mobile, battery-operated direct current stimulator connected with two electrodes. One electrode (active) is positioned over C3 (corresponding to the precentral gyrus) and the reference electrode is positioned over the contralateral supraorbital region. If current flows from C3 to the supraorbital region, then the tissue underlying C3 is subjected to anodal (increase in excitability) stimulation. If current is reversed, then the tissue underlying C3 is subjected to cathodal (decrease in excitability) stimulation.