Dr. Alexander has been the subject of discussion by both Sam Harris and Bill Maher, both of which I believe you have lambasted in the past. The episode of Maher's <Yes, the brain can be monitored. This is a highly-developed science. Maybe you would wish to explain, then, how this man's brain shut down with nothing to monitor, yet he emoted, experienced, and manufactured memory. Proof of Heaven: A Neurosurgeon's Near-Death Experience and Journey into the Afterlife by Dr. Eben Alexander
All three men were in agreement, and none was willing to accept Alexander's interpretation of his experience during a severe episode of meningitis as supernatural or indicative of the other claims he made which included that his neocortex had shut down completely, that the experience constituted proof of mind existing independently of brain, that it was an experience of an afterlife which included angels, and that it was proof of heaven - the title of his bestselling book.
Here are some quotes:
Alexander: "My synapses the spaces between the neurons of the brain that support the electrochemical activity that makes the brain functionwere not simply compromised during my experience. They were stopped. Only isolated pockets of deep cortical neurons were still sputtering, but no broad networks capable of generating anything like what we call consciousness.... My doctors have told me that according to all the brain tests they were doing, there was no way that any of the functions including vision, hearing, emotion, memory, language, or logic could possibly have been intact ... my experience ... supplies a definitive new form of evidence that consciousness can exist beyond the body."
"I was a speck on a beautiful butterfly wing; millions of other butterflies around us. We were flying through blooming flowers, blossoms on trees ... and above there were these arcs of silver and gold light and beautiful hymns coming down from them. Indescribably gorgeous hymns. I later came to call them angels, those arcs of light in the sky. I think that word is probably fairly accurate ... Then we went out of this universe. I remember just seeing everything receding and initially I felt as if my awareness was in an infinite black void. It was very comforting."
Sam Harris, a neuroscientist, which is different from a neurosurgeon, offers this criticism, which specifically addresses the monitoring to which you referred, including why it was inadequate to support the claim that the neocortex had shut down:
Harris: "Everything that Alexander describes ... has been reported by DMT users ... Does Alexander know that DMT already exists in the brain as a neurotransmitter? Did his brain experience a surge of DMT release during his coma?... similar experiences can be had with ketamine, which is a surgical anesthetic that is occasionally used to protect a traumatized brain. Did Alexander by any chance receive ketamine while in the hospital?... His assertion that psychedelics like DMT and ketamine do not explain the kind of clarity, the rich interactivity, the layer upon layer of understanding he experienced is perhaps the most amazing thing he has said since he returned from heaven. Such compounds are universally understood to do the job ... "CT scans and neurological examinations cant determine neuronal inactivityin the cortex or anywhere else. Alexander makes no reference to functional data that might have been acquired by fMRI, PET, or EEGnor does he seem to realize that only this sort of evidence could support his case.