>> the concepts came straight into my mind. you are loved, you are cherished, there is nothing you have to fear, there is nothing you can do wrong. >> reporter: and that woman, after he recovered, eben saw a picture of his long dead sister who he had never met. it was her. >> it was the most profound experience i have ever had in this life. >> reporter: a lot of people are going to say, doctor, it was an hallucination. >> i know this was not a hallucination. it really occurred and i know it occurred outside of my brain. >> reporter: many of his colleagues in neuroscience are deeply skeptical saying his brain must have produced visions perhaps when he awakened. but alexander says that crystal clear experience he had is incompatible with the random confusion of a brain rebooting. he is now on a mission to share his story. >> our soul, our consciousness, our spirit doesn't depend on the existence of the brain and body at all.