For the first time ever, we’ve caught a glimpse of what human brain waves look like in a dying person.

After a fall, an 87-year-old male went to the emergency room and rapidly deteriorated while hooked up to an electroencephalograph (EEG) machine that captured his brain waves as he passed from a heart attack. This is not the first time we’ve seen the brain activity in a dying person—some patients who have been pulled off of life support have had simplified EEG recordings taken, though they’ve been limited to frontal cortex signals. This, however, is the first case of detailed recordings that may be able to shed some light on what we experience when we die.

“For decades now, people have reported episodes of paradoxical lucidity and heightened consciousness in relation to death. This is intriguing as this seems to be occurring in brain areas that are shutting down in relation to death,” says Dr. Sam Parnia, director of critical care and resuscitation research at NYU Langone.

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“Although, in the past, it had been assumed that these may simply be anecdotes, population surveys have indicated that this phenomenon occurs in around 10 percent of the population [suggesting] that around 800 million people are living with this,” Parnia tells Popular Mechanics.

Read more: Men’s Health