You could be a psychopath if you don’t yawn: Scientists reveal that people with low empathy levels don’t copy the gestures of others
- Scientists have found that the more psychopathic characteristics people have, the less they are affected by ‘contagious yawning’
- Researchers from Baylor University tested students for anti-social traits
- Those who scored highly on ‘cold-heartedness’ were less likely to yawn when shown video clips of facial expressions