I can't but there are medical theories that explain it.
Actually there are no medical theories that explain it - PERIOD!
I challenge you to read Pam Reynold’s NDE and try to come up with ANY rational explanation for what she remembered or visualized during her operation and NDE.
http://www.salon.com/2012/04/21/near_death_explained/
“This case is particularly impressive given that during cardiac arrest, the flow of blood to the brain is interrupted. When this happens, the brain’s electrical activity (as measured with EEG) disappears after 10 to 20 seconds. In this state, a patient is deeply comatose. Because the brain structures mediating higher mental functions are severely impaired, such patients are expected to have no clear and lucid mental experiences that will be remembered. Nonetheless, studies conducted in the Netherlands, United Kingdom, and United States have revealed that approximately 15 percent of cardiac arrest survivors do report some recollection from the time when they were clinically dead. These studies indicate that consciousness, perceptions, thoughts, and feelings can be experienced during a period when the brain shows no measurable activity.”
http://www.salon.com/2012/04/21/near_death_explained/
I’d say that not only are there no medical theories that explain NDE’s. NDE’s defy current scientific understanding.
It is incredulous to think we have the answers to everything and there was nothing new to learn. We are just barely scratching the surface of parapsychological research.