Years and years ago, I had read something in a book that clinically examined Joan of Arc and gave a hypothesis regarding her visions, using her own descriptions of the episodes and using what she experienced as symptoms. I can't remember if they had said it was epilepsy or a brain tumor.
I saw this article today and it got me thinking again. I also started thinking about how in the past, GB has talked about visions/divine inspiration/whatever... Russell even endorsed a woman's book where she supposedly spoke to a "fallen angel".
Kinda made me wonder...