Mr A’s story – described in a paper in the journal Resuscitation – is one of a number of reports that challenge accepted wisdom on near-death experiences. Until now, researchers assumed that when the heart ceases to beat and stops sending vital blood to a person’s brain, all awareness immediately ends. At this point, the person is technically dead – although as we learn more about the science of death, we are beginning to understand that, in some cases, the condition can be reversible. For years, those who have come back from that inscrutable place have often reported memories of the event. Doctors mostly dismissed such anecdotal evidence as hallucinations, and researchers have been reluctant to delve into the study of near-death experiences, predominantly because it was viewed as something outside of the reach of scientific exploration.

But Sam Parnia, a critical care physician and director of resuscitation research at Stony Brook University School of Medicine in New York, along with colleagues from 17 institutions in the US and UK, wanted to do away with assumptions about what people did or did not experience on their deathbeds. It is possible, they believe, to collect scientific data about those would-be final moments. So for four years, they analysed more than 2,000 cardiac arrest events – moments when a patient’s heart stops and they are officially dead.

Of those patients, doctors were able to bring 16% back from the dead, and Parnia and his colleagues were able to interview 101 of them, or about a third. “The goal was to try to understand, first of all, what is the mental and cognitive experience of death?” Parnia says. “And then, if we got people who claimed auditory and visual awareness at the time of death, to see if we are able to determine if they really were aware.”

Seven flavours of death

Mr A, it turned out, was not the only patient who had some memory of his death. Nearly 50% of the study participants could recall something, but unlike Mr A and just one other woman whose out-of-body account could not be verified externally, the other patients’ experiences did not seem to be tied to actual events that took place during their death.