New research from a team led by a psychologist at the University of Kent suggests that humans, like other species, can perceive certain scents as threatening.
Dr Arnaud Wisman, of the University's School of Psychology, found that putrescine, the chemical produced by decaying tissue of dead bodies, can produce a fight-or-flight response in humans.
In four different experiments, people were exposed consciously and non-consciously to putrescine.