Even with decades of scientific progress and cutting-edge technology, the human body continues to hold secrets that puzzle researchers and medical professionals. Given how incredibly intricate our biological systems are, it’s not entirely shocking that some aspects remain unexplained.
One fascinating discovery suggests that, much like having a so-called “sixth sense,” humans might actually have the ability to sense death. According to recent findings, the body begins to decompose the moment life ends, releasing a chemical compound known as putrescine—a pungent and toxic odor produced during the early stages of decomposition. Interestingly, humans appear to detect this scent on a subconscious level, triggering immediate behavioral responses.
Psychologists Arnaud Wisman from the University of Kent and Ilan Shira from Arkansas Tech University have studied this phenomenon in depth. Their research indicates that, similar to many animals, humans have instinctive reactions to certain smells, especially those linked to danger. This ability, rooted in survival instincts, helps us make rapid decisions when confronted with potential threats.
When individuals are exposed to putrescine, their responses mirror those of animals sensing a predator—either distancing themselves or becoming increasingly alert. This occurs both consciously and unconsciously, even if the person isn’t aware of the source of their discomfort.
As Wisman and Shira explain, “We often don’t understand why we are drawn to or repelled by someone’s scent, and we’re largely unaware of how much smell affects our emotions and behavior.” While it might be difficult to imagine a smell being “frightening,” research shows that certain odors can in fact heighten our awareness and influence how we interact with the world around us.
This is similar to how pheromones—chemicals released by the body to attract mates—affect human interaction, except with a much darker twist. While pheromones stimulate connection and attraction, putrescine seems to provoke avoidance and even hostility. Yet, unlike pheromones, the smell of putrescine is not consciously recognized as a signal of death or fear—our brains process and react to it beneath the surface of awareness.