Because vascular type dementia is essentially reduced blood flow to the brain, albeit from a different mechanism, it makes sense that our "dementia" would be eerily similar, but of a milder and reversible form. Hmmm. I'm not sure I understand brain fog. Maybe I don't have it? Maybe it was so long ago I don't remember? Maybe I jumped straight to the encephalitis-type deficits? This is so very basic, I know, but can you better describe brain fog? Is it the feeling that visual and auditory information is jumbled and my brain can't keep up - like being on a merry-go-round (carousel) when you can't quite pin down objects in the distance because they move by too quickly?