I once got to watch a man have a stroke in front of me. It wasn't like a "stroke" like getting struck, BOOM! It was like a progressive pall descending on the patient where he slowly but progressively lost more and more function on one side of his body.
He was actually able, at first, to articulate his experience, as in "That's strange, I can't seem to move my left arm very well, can I?" He tested himself. I could almost envision the brain cells as they lost function, one by one. By the end of the fifteen or so minute run to the hospital, and as I did what I could (which was basically establish IV and secure his airway), he was completely paralyzed on one side, yet still conscious.
My understanding is: regardless the cause of the stroke, it's all about location, location, location.