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Results of the computer simulation for the experimental set-up used in the present study for tDCS over P4 (and vice versa for P3). Please note that current intensity did not exceed 0.015 mA. Thus, current density was below 0.01 mA/cm2 in frontal brain areas but reached values equal or larger than 0.019 mA/cm2 in the intraparietal cortex. According to Nitsche and Paulus (2000) a minimum current density of 0.017 mA/cm2 is necessary to modify cortical excitability by tDCS in humans.
