Did they feed him Miracle Gro brain food?
http://www.comachameleon.com/2015/10/did-they-feed-him-miracle-gro-brain-food.html

Perhaps that would explain why Eben Alexander now seems to have a functioning cerebral cortex. Or, maybe, just maybe, his brain was still functioning during his near-death experience. That would also account for the similarities between his NDE and my coma-dream,