Yawns May Not Be Contagious For Psychopaths

A new study has found that people with more psychopathic traits tend to be less likely to yawn after seeing someone else do it; researchers believe this may be related to their lack of empathy.

Psychopaths are commonly characterized as having a lack of empathy with people, and a new study has revealed an interesting way this could manifest. 
Researchers have found that those with stronger psychopathic tendencies are less likely to yawn after seeing someone else do it. 
Yawning has been found to be contagious among humans and other social animals like dogs and chimpanzees. 
The investigation began when Brian Rundle, the lead researcher,