Localization of stimulation sites: Stimulation sites will be localized using a modification of the surface distance measurements (SDM) method. Study centres will send the patient's T1-weighted MRI to the study coordinating centre. Surface renderings of the MRI will be generating using the 3D-Tool. Reference measures relative to the nasion-inion line will be identified on these reconstructions and sent to the participating centre. The person preparing the stimulation can verify the distances on the real patient's head and determine the respective stimulation site. The method has an accuracy of approx. 8 mm for localizing Broca's Area when compared to neuronavigation. Having designed the study with broad and cost-effective applicability in mind, we chose this approach although the centres do have advanced neuronavigation available.