Neuroscientist James Fallon recently had his book published, "The Psychopath Inside: A Neuroscientist's Personal Journey into the Dark Side of the Brain ". Incredibly within it, among other things, he lets the World know he is a diagnosed Psychopath. Sociopaths and Psychopaths both manifest a particular body language/facial expression with significantly greater frequency than everyone else.
Every human being OCCASIONALLY has his/her central forehead contracted at the same time he/she mouth-smiles. The vast majority of us do this just once in a while. This indicates incredulity, smugness or arrogance and can also be seen during contempt - and every healthy person feels these emotions from time to time. However when this combination occurs often (in a relatively small minority of the population) it is highly consistent with sociopathic or psychopathic pathology.
The vast majority of the time when the central forehead is contracted (CFC) the mouth is configured in an expression of pain, sorrow, anger or fear. It is primarily contracted during moments of emotional or physical pain - either for oneself or experienced secondarily via empathy. Thus this misdirected prevalence of the CFC out of context with a mouth smile seen in sociopaths and psychopaths is an outward manifestation of their inability to feel emotional empathy.
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