Learn about mental disorders of man can be his tendency to yawn. This conclusion was American scientists from Baylor University, writes Daily Mail .
Scientists have found that people with psychopathic temperament can not be "contagious yawning". Normal as mammals, including humans, unable to resist this phenomenon, they say.
"Do you want to know whether someone is a psychopath? Try to yawn at them. If they yawn in response, then everything is fine, continue to maintain friendly relations with them if you want. If they do not, then maybe you should stay away - in their character clearly traced antisocial traits "- recommends publication.
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