The question of what happens after death has captivated humanity throughout history. For many, the belief in an afterlife provides solace. Yet, science remains unable to provide a definitive answer. This article explores the physiological changes a person undergoes after their last heartbeat, accounts from those who experienced clinical death, the scientific evidence (or lack thereof) for an afterlife, and how various cultures and religions interpret this profound mystery.
The Enduring Question of Post-Mortem Existence
Anna Ovsyannikova, Associate Professor at the Department of Mathematics and Data Analysis at the Financial University under the Government of the Russian Federation, states, “The question `Is there life after death?` is not merely a philosophical dilemma but an existential query that concerns everyone. It connects ancient cultures with modern laboratories, temples with universities, and believers with skeptics. Advances in medicine and neuroscience have made the boundary between life and death more permeable, yet no less enigmatic.”
Defining Death in the 21st Century
In the 21st century, death is understood not merely as an event but as a process. According to Anna Ovsyannikova, modern medicine distinguishes several stages:
- Clinical death is a state where breathing and circulation cease, but brain tissues have not yet died. This “window” typically lasts 4–6 minutes, after which irreversible changes occur.
- Biological death signifies the complete and irreversible cessation of all vital bodily functions.
- Brain death is an officially recognized criterion for death in many countries. As per the American Academy of Neurology, it`s a condition where all brain functions, including the brainstem, are irrevocably lost.
Ovsyannikova notes, “Interestingly, recent years have seen evidence of brief preservation of brain activity even after cardiac arrest, which challenges previous understandings of the boundaries between life and death.”
Near-Death Experiences and Their Accounts
One of the most perplexing phenomena is near-death experiences (NDEs), reported by up to 20% of individuals who have survived cardiac arrest. These accounts share striking similarities:
- An out-of-body sensation
- A light at the end of a tunnel
- Feelings of peace and love
- Encounters with deceased relatives
- A panoramic review of one`s life
In 2017, researchers from the University of Liège (Belgium) examined written testimonies from 154 patients who had experienced clinical death. Almost all described three consistent sensations: a feeling of peace, traveling through a long tunnel, and a bright light appearing at the end of this journey. Some survivors claimed to have left their bodies and encountered angels or spirits during this state.
However, the sequence of these experiences varied among the majority. Only 20 percent of those surveyed reported first leaving their physical body before moving through a tunnel towards a bright light. According to the study`s authors, this suggests that each person`s near-death experience is unique, and the sensations or hallucinations might depend on their language and culture.
Anna Ovsyannikova highlights the AWARE project, led by Dr. Sam Parnia, as the largest study on this topic. Conducted from 2008 to 2014, it involved 2,060 patients in hospitals across the USA and the UK. Approximately 39% reported a sense of awareness during cardiac arrest, and one patient was able to accurately describe events in the operating room when their brain activity should have ceased.
For nearly four years, scientists collected stories from patients who had survived clinical death due to heart attacks. They interviewed doctors and nurses who worked to revive these individuals. Most remarkably, many survivors recounted medical staff conversations almost verbatim and accurately reconstructed the sequence of their actions. A third of the patients reported that everything happened very slowly, as if time had paused. Like their Belgian counterparts, American survivors on the brink of death also experienced feelings of serenity, saw bright lights, and observed their physical bodies from a distance.
Researchers at the University of Montreal (Canada) even recorded brain activity after an electroencephalogram (EEG) displayed a flatline – the primary indicator of nerve cell death. Initially, they observed brain activity above the flatline EEG in a deeply comatose patient. Similar fluctuations were then found in EEGs of cats intentionally induced into reversible coma. These previously unknown oscillations originated in the hippocampus – the brain region responsible for memory and cognitive functions – and spread to the cerebral cortex.
According to American scientists, the brain doesn`t just die with the heart; on the contrary, it may start working at an accelerated pace. Dopamine, a pleasure hormone vital for reward systems and cognitive processes, increases by almost 12 times. This could explain why people experience both a feeling of peace and the sensation of thinking very rapidly, as reported by 65 percent of clinical death survivors.
Furthermore, during agony, serotonin levels surge by 20 times, activating numerous corresponding receptors in the brain. These receptors, in turn, are linked to visual hallucinations. Out-of-body experiences, encounters with angels and spirits, and the bright light at the end of the tunnel could all be results of this surge in the `happiness hormone.`
Israeli researchers propose that near-death experiences are a result of abnormal brain activity caused by a lack of oxygen due to cardiac arrest and reduced blood flow. The sensation of one`s entire life flashing before their eyes (recalled by nearly half of survivors) is likely due to the activation of the prefrontal, medial temporal, and parietal lobes of the brain. These areas receive blood and oxygen longer than other regions and are the last to shut down.
All these findings suggest that the brain might continue to function for some time after cardiac arrest, and consciousness could potentially persist.
Physiological Changes Post-Mortem
Immediately after the cessation of blood circulation, a cascade of physiological changes begins. However, certain body cells – such as skin, cornea, and bone marrow – can continue to function for several hours post-mortem. This allows for their use in transplantation, indicating that death, in this context, is not an instantaneous event but a transitional phase.
Scientific Evidence for an Afterlife?
According to Anna Ovsyannikova, current scientific knowledge lacks conclusive evidence for the existence of life after death. No clinical death experience can be objectively verified as a genuine connection with another realm. All descriptions can be attributed to brain activity under hypoxic (oxygen-deprived) conditions, endorphin release, or residual neuronal activity.
Nevertheless, in 2023, a team of neurophysiologists from the University of Michigan published a study showing a surge of organized brain activity, similar to wakefulness, in rats after cardiac arrest. This led to discussions about a “final brain awakening” – a mysterious “neuropike” where consciousness might persist longer than previously believed.
Scientists` Perspectives on Life After Death
Physicist Roger Penrose (Nobel Prize, 2020) and anesthesiologist Stuart Hameroff have proposed a hypothesis on the quantum nature of consciousness, suggesting that information might exist outside the physical body. While their theory remains unconfirmed, it continues to inspire philosophers and science communicators.
Meanwhile, a 2021 Pew Research survey indicated that only 27% of natural scientists in the USA believe in an afterlife. The majority either deny its existence (54%) or consider it a philosophical question without a scientific answer.
Cultural and Religious Views on the Afterlife
Anna Ovsyannikova points out that humanity has conceived dozens of afterlife concepts, ranging from resurrection to reincarnation.
A 2022 Gallup poll reveals that 72% of people worldwide believe in life after death. This belief manifests in various forms but remains a universal human phenomenon.
Nikolai Bukanev, a history popularizer and author of the historical channel `11 ECU,` explains that for many, denying any form of afterlife is a way to combat their fear of the unknown. He suggests, “If everyone were certain that death instantly and completely extinguishes existence, wiping away personality, consciousness, and memory, then the end of life wouldn`t be so unsettling. Therefore, people often find it more convenient to convince themselves of life`s absence, telling others about supposed scientific studies, the lack of evidence, or the absence of `signals from beyond.` In such a scenario, one wouldn`t have to account for their overt and hidden actions in their current life.”
For religious individuals, the answer also represents salvation. They lead righteous lives, adhering to their faith`s tenets, and thus expect a better fate than those who do not.
According to Nikolai Bukanev, these two seemingly opposing viewpoints are, in fact, quite similar. It appears that all people believe something happens after death. Some believe in a Great Judgment where they will attain a better eternal life, while others believe death offers liberation from life`s burdens, a total deletion of all “files,” both beneficial and detrimental.
The perspective that there is nothing after death closely resembles Eastern philosophical views where the ultimate blessing in the cycle of constant rebirths (Samsara) is the cessation of this movement, leading to a total deletion of all “files” that connect us to life.
Bukanev elaborates, “In monotheistic religions, particularly Christianity, earthly life is considered the foundation for future life – an examination we undergo before facing the ultimate Judge. Therefore, there`s no plan to erase earthly experiences; instead, we are expected to remember every action, every day, and bear responsibility for it.
To ensure this doesn`t seem too harsh, as humans are prone to error, Christianity offers the sacrament of confession, where individuals can seek forgiveness for their sins beforehand, as this option is not available after death. Moreover, there`s another form of leniency, a path to passing the `main Exam`: the prayers of your relatives and descendants for you. That’s why we pray for our departed friends, family, and acquaintances—not just to send greetings, but to lighten their lives after death. And at the same time, to reflect on ourselves: Has the time come for preparation?”
Concluding Thoughts from an Expert
Anna Ovsyannikova, Associate Professor at the Department of Mathematics and Data Analysis at the Financial University under the Government of the Russian Federation, provides her insights:
“Why is this question important? Death serves as a mirror to life. Recognizing its inevitability shapes our personal values, motivation, and worldview. The meaning of life, a sense of duty, the pursuit of creativity – all of these perhaps exist precisely because we know that one day, everything will conclude.
Regardless of the answer – whether there is life after death or not – this question remains one of the most powerful catalysts for science, religion, and art.
Modern science is still far from comprehending the nature of consciousness and the ultimate boundaries of life. But one thing is clear: belief in an afterlife is not merely an attempt to escape the fear of death, but also a way to imbue meaning into what happens here and now.
As Hemingway wrote, `A man can be destroyed but not defeated.` Perhaps it is in this resilience to finitude that our immortal part resides.”
Rupert Blackwood 
Clement Ashworth