Research suggests that a poor sense of smell may be a linked to psychopathic traits

Mahmut and Stevenson from Macquarie University in Australia looked at whether a poor sense of smell was linked to higher levels of psychopathic tendencies, among non-criminal adults living in the community. Researchers assessed the participants' ability identify smells and tell the difference between smells. They also measured subjects' levels of psychopathy.

The researchers found that those individuals who scored highly on psychopathic traits were more likely to struggle to both identify smells and tell the difference between smells, even though they knew they were smelling something. These results show that brain areas controlling olfactory processes are less efficient in individuals with psychopathic tendencies. These findings are published online in Springer's journal Chemosensory Perception.