The neuroscience of the final moments: a chemical and neural surge
In short: When the body begins to fail, the brain may not simply shut down. Instead, a complex interplay of chemicals and electrical activity might create a final, vivid narrative of life, potentially explaining why so many people report profound peace or mystical visions at the very end.
Research suggests that the commonalities in near-death experiences—such as euphoria, out-of-body sensations, and 'life flashing before your eyes'—may be rooted in specific biological mechanisms. When the brain faces death, it may release a rush of endorphins, which can induce feelings of contentment. Simultaneously, high levels of carbon dioxide can distort vision, creating the sensation of moving through a tunnel, while a lack of oxygen can trigger hallucinations.
Neuroscientists have identified specific regions of the brain that may be responsible for these sensations. For instance, a 2015 study by Dieguez concluded that 'disembodied' experiences may stem from disturbances in the temporo-parietal cortex, the area responsible for our sense of self and bodily perception. This mirrors experiences reported by individuals on psychedelic drugs like DMT, which some researchers, such as Rick Strassman, suggest might be naturally produced by the pineal gland during near-death states.
Perhaps most striking is the activity observed in the final moments of life. Research by University of Michigan's Jimo Borjigin revealed that rodents undergo a spike in gamma-band neuronal firing moments prior to dying, occurring simultaneously with theta-wave patterns linked to retrieving working memories. This may provide a neural basis for the subjective experience of reviewing one's life. However, the experience depends on the mode of death; while slow death might feel like falling asleep due to hypoxia, sudden cardiac death can result in a total body shutdown with no sensations at all.
Finally, the transition of consciousness is often a gradual sensory decline. According to James Hallenbeck, senses are typically lost in a specific order: hunger and thirst first, followed by speech, then vision, with hearing and touch often being the last to fade. This suggests that even as a person's internal world recedes, they may still be able to perceive their surroundings through touch and sound.
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Sources
- Summary by Intellect · source: What it Might Feel Like to Die: Neuroscience has an answer
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