Inclusion Criteria:  Ability to provide informed consent Patients with pathological diagnosis of Alzheimer's disease according to the National Institute on Aging and Alzheimer's Association, NIA-AA, criteria (Alzheimer's group) or cognitively normal individuals within 1.5 standard deviation of normal in all tests (control group)  Exclusion Criteria:  Lack of mental capacity to consent to study involvement Not speaking English before age 5 years Learning disability Schizophrenia Substance misuse Implanted devices not certified as compatible with ultra-high field MRI (e.g. cardiac pacemaker) Pregnancy