Memory Deterioration in Alzheimer Disease

Inclusion Criteria: * Confirmed diagnosis based on current ICD criteria for AD or MCI . * \>55years. * Norwegian native speaker * Lives at home and not in a health institution Exclusion Criteria: * Patients with severe cognitive impairment that prevents assessment with the selected modalities (planned cut-off: CDR \> 2). * Presence of brain tumors. * History of traumatic brain injury. * History of cranial surgery. * Contraindications to the selected imaging modalities (e.g., 7T MRI or EEG). * Diagnosis of other neurodegenerative diseases such as Parkinson's disease or ALS. 7T MRI contraindications: * Large tattoos close to the head region, permanent makeup or unremoveable piercings * Certain models of pacemakers (if pacemaker implantet, MRI physicist at 7T-lab will be conferred) * Implantet metal in body (clips, stents, prothesis, skrews, plates, teeth etc.)