If you're curious about whether a colleague, relative, romantic partner, or total stranger is a psychopath, try this simple test: Yawn, and see if they yawn back.
A new study has found that people with psychopathic personality traits don't "catch" the contagious yawn because they aren't very empathetic, lead author Brian Rundle told Today.com. Rundle says that yawning when you see someone else doing it is a primitive form of communication and bonding, but said you can't automatically label someone who doesn't yawn back at you a psychopath: You're less likely to yawn after someone else if you are older, and more likely to yawn if you know the person.
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