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Our lives may indeed flash before our eyes in our last moments, the first-ever recording of a dying human brain has revealed.
Scientists have accidentally discovered what goes on inside a human brain just before a person dies after a man with epilepsy died of a heart attack while undergoing a brain scan to detect and treat his seizures.
The subsequent study of the man's brain activity, which has been published in Frontiers in Aging Neuroscience, suggests an explanation for people reporting experiencing vivid life recall in near-death experiences.
Scientists were using electroencephalography (EEG) to detect and treat seizures in the 87-year-old man when he passed away, leading to the first-ever recording of a brain's activity during death.
Dr Ajmal Zemmar, a neurosurgeon at the University of Louisville, who organised the study of the recording, has said the research shows people may in fact relive their lives in the seconds before they die.
He explained researchers focused on activity in the man's brain in the 30 seconds before and after the heart stopped beating.
"Just before and after the heart stopped working, we saw changes in a specific band of neural oscillations, so-called gamma oscillations, but also in others such as delta, theta, alpha, and beta oscillations," Dr Zemmar said.
Brain oscillations, also known as 'brain waves', are patterns of rhythmic brain activity.
The different types of waves, including gamma, are involved in high-cognitive functions, such as concentrating, dreaming, meditation, memory retrieval, information processing, and conscious perception, just like those associated with memory flashbacks.
"Through generating oscillations involved in memory retrieval, the brain may be playing a last recall of important life events just before we die, similar to the ones reported in near-death experiences," Dr Zemmar said.
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"Something we may learn from this research is: although our loved ones have their eyes closed and are ready to leave us to rest, their brains may be replaying some of the nicest moments they experienced in their lives."
Studies have previously analysed rats' brains as they died and have found increased activity in their brains in the 30 seconds after cardiac arrest.
