"Experts currently believe that the brain shuts down within 20 to 30 seconds of the heart stopping beating – and that it is not possible to be aware of anything at all once that has happened.
But scientists in the new study heard said they heard compelling evidence that patients experienced real events for up to three minutes after this had happened – and could recall them accurately once they had been resuscitated."
How are people having "experinces" while there is no evidence of heart or brain activity?