Fig. 2

Current flow modeling during 2 mA High-definition transcranial direct current stimulation (HD-tDCS) using the HD-Target software (Soterix Medical, New York, NY). Current-flow models are shown on 2D and 3D reconstructions of the cortical surface. Skin, skull, and cerebrospinal fluid (CSF) masks are suppressed to reveal the underlying gray matter mask. The spatial profile of the current flow map is exactly the same as at 1.5 mA current injection but with induced electric field values scaled linearly. This is due to the linearity of the electric field solution [78]. A head model derived from the MNI 152 dataset was used