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a) Cut through the finite element model, showing the skull (red), CSF (green), cortex (yellow) and various deeper brain regions. b) Location of the left and right primary motor cortex (pink) in the model. c) Electrodes on the skull surface of the model, placed based on experiments performed by Grossman et al. (2017) (the left cathode eLc is not visible here; it is placed symmetrically to eRc).
