Figure 1. Finite element models of conventional (A) and HD-tDCS (B) of the right hand motor cortex (C3) using HDExplore computational modelling software.

Electrode placement is presented with red markers representing anodal and blue markers representing cathodal electrodes. Slice positions are taken at MNI coordinates of −31, −8, and 40 for sagittal, coronal, and axial slices, respectively. A field intensity range of 0.00–0.32 was used in both conventional and HD-tDCS models. White circles represent the centre position of each slice while the direction of the current flow is indicated by black arrows.