Brain Activity Shows Basis of Near-Death "Light"
"There may be a scientific explanation for the vivid near-death experiences, such as seeing a shining light, that some people report after surviving a heart attack."
University of Michigan scientists performed research on nine lab rats that were anesthetized and then subjected to induced cardiac arrest. In the first 30 seconds after their hearts stopped, they all showed a surge of brain activity, observed in electroencephalograms (EEGs) that indicated highly aroused mental states.
"In fact, at near-death, many known electrical signatures of consciousness exceeded levels found in the waking state, suggesting that the brain is capable of well-organized electrical activity during the early stage of clinical death."