Death and the Human Senses
Death is a universal experience, yet it remains one of life’s greatest mysteries. Much of what happens after death is unknown, but science is beginning to uncover how humans subconsciously detect and react to it.
The Scent of Death
When someone dies, their body releases a chemical called putrescine, which has a foul, toxic smell. While most people aren’t aware they’re smelling it, the human brain recognizes this odor and responds automatically. Researchers Arnaud Wisman and Ilan Shira explain that humans, like animals, are hardwired to react to certain scents for survival. “When humans are exposed to the putrescine scent, they move away similarly to animals who also run away in similar circumstances.”
A Subconscious Warning System
This reaction is mostly subconscious. As Wisman and Shira note, “We do not know why we like (or dislike) someone’s smell, and we’re usually not aware of how scent influences our emotions, preferences, and attitudes.” The smell of putrescine doesn’t bring attraction, like pheromones, but instead triggers fear or avoidance. “Putrescine signals a different type of message than pheromones, but people’s responses… do seem indeed to be the opposite.”
Smell, Emotion, and Survival
While it may seem strange to think of a scent as frightening, researchers believe certain smells can alert us to danger. Though we may not realize it, our nose can signal us when something is wrong—like nearby death or decay.
