In humans, it has been shown that cathodal stimulation can decrease the excitability of the motor (Nitsche and Paulus 2000; Liebetanz et al. 2002; Nitschc, Nitsche et al 2003), visual (Antal et al. 20)1. 2004) and somatosensory convex (Dlcckh&cr et al. 2(06). In the first experiment, the cathodal ele