When humans are exposed to the odor of putrescine, they express a conscious and subconscious reaction to it.

Some of the experiments conducted by these two researchers revealed that when people are exposed to the scent of putrescine, they move away, just like the animals which either run away or fight when they sense danger.

“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,” Wisman and Shira explain.

“It is hard to think of a scent as frightening,” other researchers claim. However, scents do make people more vigilant of their surroundings.

Sex pheromones, which are defined as odors produced by either males or females, that stimulate one or more behavioral reactions in the opposite sex, bringing the males and females together for the purpose of mating are just another example of the effect of scent at humans.

“Putrescine signals a different type of message than pheromones, but people’s responses to putrescine (avoidance and hostility) do seem indeed to be the opposite of responses to many sexual pheromones,” researchers explain. At the same time, the researchers explain that humans are not aware o the odor and don’t consciously associate it with death or fear.

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