V. 2007. Shaping the effects of transcranial direct current stimulation of the human cortex. J Neurophysiol. 97:3109-3117. Nitsche MA. Nitsehe MS. Klein CC. Tergau F. Rothwell JC. Paulus W. 2003. Level of action of cathodal DC polarisation induced inhibitkm of the human motor cortex. Gin Neurophysiol 1