There are many signs that someone is a psychopath. They have traits like superficiality, narcissism, a grandiose sense of self, pathological lying, lack of guilt and empathy, and so much more. Research has also shown that staying friends with an ex makes you a possible psychopath.
According to one study published in Personality and Individual Differences, researchers found that there is a link to being a psychopath and yawning. To be more specific, when you yawn.
Baylor University researchers gathered 135 subjects, had them take the Psychopathic Personality Inventory, and then conducted an experiment where they exposed the subjects to yawning.
Before we explain further, test yourself with this video of different people yawning and see how long you last watching without yawning:
How long did you last without yawning? The first 5 seconds? Or all the way to the end? If you gave into your yawns before the end, congratulations! You are not a psycopath. If you didn't, however, then... you might be one.
According to researchers, it all has to do with empathy. One of the signs of being a psycopath is their lack of empathy towards another person.
"Empathy is one of the core psychological factors that leads to catching yawns," says Psychology Today. Prior studies have noticed this same lack of empathy on children on the autism spectrum (that does not mean, however, that autistic individuals are psycopaths; it just means that they are less likely to catch a yawn).
And it wasn't just the test subjects' lack of a yawn that researchers tested. They were also tested on how easily they were startled (psycopaths lack fear). The less likely someone was startled, the less likely there were to yawn.
"Of course, this is not a diagnostic tool for psychopathy, but it is an interesting connection, showing how these personality traits affect various behaviors in unexpected ways," says Psychology Today's Jennifer Golbeck.
So, relax! Just because you didn't yawn throughout that whole video doesn't mean you'll start cooking up human flesh like Hannibal. It probably just means that you tend to be ruthless, you don't let your emotions get in the way of what you need to do, and you can easily make tough decisions.
It's still a very interesting study.