MR imaging procedures: MRI will be performed on a 3T SIEMENS MAGNETOM TrioTim syngo MR B17. We will acquire volumetric data-sets with 1mm resolution comprising one T1-weighted image for determination of stimulation site (ADNI-MPRAGE, 10 minutes, 192 sagittal slices, 1mm thickness, TR 2300 ms, TE 2.98ms), fluid attenuated inversion recovery sequences (axial FLAIR, 3.5 minutes, 60 slices, 2mm thickness, flip angle 150 deg, TR 900ms, TE 70ms) for infarct localization and quantification of infarct volume followed by two 10 minute resting state fMRI sequences (BOLD MOSAIC 64, 10 minutes, 34 slices, 4mm thickness, 90deg flip angle, TR 1810ms, TE 30ms) and a 10 minute diffusion sequence (63 slices, 2mm thickness, TR 8400ms, TE 90ms, 64 directions)