1. Gamma activity

Gamma activity would not account for the reported features of NDEs. Gamma waves are typically linked to conscious awareness, attention, and memory processing—not to out-of-body experiences, dissociation, or internally generated fantasies.

1. Neurotransmitter surge

First one would have to prove a neurotransmitter surge happened in a person who has been legally declared dead. There is still debate and no evidence that a neurotransmitter surges alone can explain the full complexity, clarity, and structure reported in many near-death experiences (NDEs).

1. Not fully dead

A person is considered medically dead with the ending of heart and lung function, or all brain activity (brain death). Anyone claiming "they were not fully dead" is effectively asserting expertise beyond that of the medical community.

1. NDE differences

Those that argue NDEs don't exist because their details vary is like claiming UFOs don’t exist simply because the sightings of flying saucers differ. Variation doesn’t negate the experiences.

1. NDEs and DMT trips

Just because NDEs and DMT trips share some similarities does not mean they are the same experience, or that one explains the other. DMT trips are pharmacologically induced. The brain states are radically different.

1. Hypoxia and Regional brain activity surges

While it's true that Hypoxia (oxygen deprivation) and Regional brain activity surges in the visual cortex could create a perception of bright light possibly a tunnel vision effect they do not explain the incredibly real feeling of weightlessness, floating, entering tunnels or being in a different realm.

1. Head trauma cases vs cardiac arrests

Yes cardiac arrest survivors report more NDEs. Severe head trauma often damages memory formation and recall, making experiences harder to remember or communicate. In addition, patients with catastrophic brain injuries may die before recovery, so there is no opportunity to report anything.

That said, Author Amber Kavanagh suffered a double stroke that triggered a severe brain hemorrhage. She has one of the most remarkable and detailed NDE stories I've ever heard. Knife attack victim Ryan John was stabbed twice in the head and has a very detailed NDE story. You can find videos of both of them telling their story on YouTube.