This course aims to introduce physics principles of Magnetic Resonance Imaging (MRI) that may be important for empowering psychologists and neuroscientists to use the most cutting edge tools offered by this imaging modality. MRI is indeed more than pretty pictures and can be used to exploit magnetic properties of the brain tissue to study mechanisms of brain function in health and disease. It also offers the possibility to assess the brain from a microstructure point of view, or from connectivity and metabolic angles. It can also be used to probe some ions distribution such as sodium concentration. The course will propose the physics behind MRI that makes it such a diverse technique and will offer clinical examples of advanced imaging methods to put this into clinical context.