[sova]

You can also have a conversation with the afflicted human being and find out. Some days are more lucid than others, but on the whole there can be a 70-90% "fog" of dementia/alzheimer's that is apparent even without a brainslice.

[hprotagonist]

In general, you can't discriminate between dementia and alzheimers with a patient interview.

[Padideh]

Correct. Alzheimer's disease is the most common cause of dementia (~80%). There are other dementia's such as FTD (frontotemporal dementia), DLB (dementia with Lewy body), vascular dementia, etc.