If you ever want to test whether or not someone is a potential psychopath, this is one way to do it. Just yawn at them. If they catch the yawn and copy you, then you’re okay. But if they don’t, then you might need to start worrying.
People who don’t react to someone else’s yawn by yawning are, according to scientists, more likely to be psychopaths.
Researchers from Baylor University, Texas, published their findings from a sample of 135 people in the journal Personality and Individual Differences.
Brian Rundle, a student involved in the study, told the Times: One of the biggest lines of evidence is that (contagious yawning is) very much related to empathy.
