The finding may explain how a person’s brain could replay conscious memories even after the heart has stopped.
Many people who have come close to death or have been resuscitated report a similar experience: Their lives flash before their eyes, memorable moments replay, and they may undergo an out-of-body experience, sensing they’re looking at themselves from elsewhere in the room. Now, a small study mapping the brain activity of four people while they were dying shows a burst of activity in their brains after their hearts stop.
Still, despite the numerous reports over hundreds of years from people who have been resuscitated following clinical death or nearly died, “I was shocked to realize we know almost nothing” about brain activity during the dying process, Borjigin says. For the current study, she and her team looked at the medical records of four people who were in comas and on life support on whom physicians had placed electroencephalography caps. None of the patients had any chance of survival.
Ajmal Zemmar, a neurosurgeon at the University of Louisville, says gamma waves may signal that different brain regions are working together to combine disparate sensations into the conscious awareness of an object—putting together the sight and smell and sound of a car, for instance.
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