Introducing the brain: dying events (Introduction)

by David Turell , Monday, June 12, 2023, 23:17 (320 days ago) @ David Turell

The brain doesn't just stop:

https://www.scientificamerican.com/article/why-dying-people-often-experience-a-burst-of...

"Before CPR techniques were developed, cardiac arrest was basically synonymous with death. But now doctors can revive some people up to 20 minutes or more after their heart has stopped beating. Furthermore, Parnia says, many brain cells remain somewhat intact for hours to days postmortem—challenging our notions of a rigid boundary between life and death.

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"Research over the past decade has demonstrated a surge in brain activity in human and animal subjects undergoing cardiac arrest. Meanwhile large surveys are documenting the seemingly inexplicable periods of lucidity that hospice workers and grieving families often report witnessing in people with dementia who are dying.

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"Christopher Kerr, chief executive officer and chief medical officer at the Center for Hospice and Palliative Care in Buffalo, N.Y., has studied the lucid visions of several hundred terminally ill people. He says these events “usually occur in the last few days of life.” Such “terminal lucidity” is defined as the unexpected return of cognitive faculties such as speech and “connectedness” with other people, according to George Mason University’s Andrew Peterson, a researcher of bioethics and consciousness.

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"As surprising as these events might seem, they are quite common. “Our study wasn’t a prevalence study,” says Jason Karlawish, a gerontologist at the Penn Memory Center and senior principal investigator of the NIH study. Nevertheless, he adds, “what we found is lucidity was more common than it was the exception in dementia patients, which would suggest that the idea of it being terminal is not entirely correct.” Instead he suggests that episodes of lucidity should be seen as part of the “disease experience” rather than as aberrant events. “We’ve actually found that a variety of these episodes occurred months, even years, before the person died,” Karlawish notes.

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"The surge of gamma waves in dying subjects was particularly intense in a brain region Borjigin refers to as the “posterior cortical ‘hot zone,’” located near the back of the skull. Some other researchers believe this region may also be essential to conscious experience. The parts of the brain in this area are related to visual, auditory and motion perception—a phenomenon Borjigin believes is involved in the out-of-body experiences reported by people who come close to death and recover. She adds that gamma-wave activation patterns akin to those observed in the comatose people are associated with activities that include the recognition of a familiar image—such as a human face—in healthy people.

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"In both the human and animal studies, the subjects’ brain showed a spike in activity after the sudden reduction of oxygen supply, Borjigin says. “It starts to activate this homeostatic mechanism to get oxygen back, either by breathing harder or making your heart beat faster,” she adds. Borjigin hypothesizes that much of the surge in more complex brain activity observed in humans and animals undergoing cardiac arrest is also a result of the brain attempting to reestablish homeostasis, or biological equilibrium, after detecting a lack of oxygen. She further speculates that these survival mechanisms may be involved in other changes in cognition surrounding death. “I believe dementia patients’ terminal lucidity may be due to these kinds of last-ditch efforts of the brain” to preserve itself as physiological systems fail, Borjigin says."

Comment: every organ makes attempts at achieving homeostasis. These lucid periods do not mimic NDE's, nor are they explained in any way by this research.