Tau Networks in Psychotic Alzheimer's Disease

This study is using brain imaging to better understand how the tau protein (a hallmark of Alzheimer's disease) spreads through brain networks — and whether psychosis symptoms (like hallucinations or delusions) in Alzheimer's patients are linked to specific patterns of tau buildup. **You may be eligible if...** - You are between 65 and 85 years old - You have a confirmed diagnosis of Alzheimer's disease dementia - You have mild to moderate memory and thinking problems (as measured by a standard test) - You may or may not have psychosis symptoms - You have a family member or carer who can accompany you **You may NOT be eligible if...** - You have another type of dementia or brain disorder - You have a history of major psychiatric illness unrelated to Alzheimer's - You are unable to undergo brain imaging (MRI or PET scan) - You have metal implants or other contraindications to MRI - You are taking certain medications that could interfere with the study Talk to your doctor to see if this trial is right for you.