Specifically - the frozen face, and the frozen body, episodes.
One other interesting symptom...
Biden stuttered as a child. At least 80% of child stutterers recover completely normal speech by age 12, with or without speech therapy.
A significant number of those former stutterers begin to stutter again, after a stroke, in old age.
Biden shows clear behavior that is consistent with the body language and the vocal tics used by someone consciously trying not to stutter.
My point - Biden may have suffered mini-strokes in the recent past.
I believe he does have a history of TIAs.. possibly associated with his brain surgeries... I’d have to go back and find where I saw that.
Biden had two life threatening brain aneurysms in 1988.