A 2013 University of Michigan study on rats found that in the 30 seconds after cardiac arrest, the brain produced a surge of high-frequency gamma waves more coherent than during waking life, a neural fireworks display some researchers think could underlie the vivid imagery reported in near-death experiences

In 2013, Jimo Borjigin's lab at the University of Michigan recorded a surge of hyper-coherent gamma waves in rat brains in the 30 seconds after cardiac arrest, a signal stronger than waking consciousness and potentially linked to near-death experiences. The post A 2013 University of Michigan study on rats found that in the 30 seconds after cardiac arrest, the brain produced a surge of high-frequency gamma waves more coherent than during waking life, a neural fireworks display some researchers th