Recent studies suggest consciousness may persist for minutes or even hours after clinical death (when the heart stops). Evidence shows the brain can experience surges of electrical activity and "gamma oscillations"—linked to memory and high-level cognition—even after the body stops responding. This suggests death is a gradual process rather than a single instant.
After studying the near-death experiences of those who have recovered after experiencing a cardiac arrest, a researcher has called for a reappraisal of the “reversibility of death”.

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