The medical literature did not encourage that idea. Decades of clinical experience and research have established that brain activity decreases within… - Bruce Greyson

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The medical literature did not encourage that idea. Decades of clinical experience and research have established that brain activity decreases within six to seven seconds of the heart stopping. And after ten to twenty seconds, the electroencephalogram (EEG) goes flat, indicating no activity in the cerebral cortex — the part of the brain responsible for thoughts, perceptions, memory, and language. Analysis of the EEGs of people after life support is withdrawn show that the brain’s electrical activity in such cases actually stops before the heartbeat stops and before blood pressure ends — and after the heart stops there is no well-defined EEG activity. That seemed to answer my question about whether NDEs could be related to electrical activity in the brain.