2. - MRI scanning: Imaging data will be acquired at the neurorradiology section of the Hospital Marques de Valdecilla, on a 3T MRI scanner (Achieva, Philips Medical Systems, Best, The Netherlands) at the Neuroradiology Department of "Marques de Valdecilla" University Hospital. Subjects will undergo a 30 minutes protocol that will include a high resolution T1- weighted image, a 64 directions DWI sequence and A BOLD resting state fMRI sequence.