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anoxia
Cerebral anoxia is the lack of oxygen to the brain. If severe, it can cause irreversible brain damage. Less severe cases can cause sensory distortions and hallucinations. Cerebral anoxia has been cited by some researchers as the cause of near-death experiences (NDEs).
further reading
Lutz, Peter and Goran E. Nilsson. The Brain Without Oxygen (Chapman & Hall, 199
anomaly