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A person's eyes can reveal if they are a psychopath or not, scientists have found.
Experts discovered that people who suffer from the personality disorder have a unique reaction to horrific scenes - their pupils do not widen.
Pupils - Dilate - Images - Part - Response
Pupils of non-psychopaths dilate when they see upsetting or distressing images as part of a natural response.
Researchers at Cardiff and Swansea Universities examined the effect of nasty images on offenders who are psychopathic and offenders who aren't and saw a marked difference in their eyes.
Author - Dr - Dan - Burley - Cardiff
Lead author, Dr Dan Burley, from Cardiff University's School of Psychology, said: 'Our findings provide physical evidence of an emotional deficit common to psychopathic offenders.
'The pupil has long been known to be an indicator of a person's arousal.
Sharks - Eyes - Opponents - Hand - Salesperson
'Card sharks have learnt to look carefully at the eyes of their opponents to gauge if they have a great hand, and many an astute salesperson knows to up their price if your eyes reveal your excitement at their product.
'Likewise, the pupil usually dilates when an image shocks or scares us.
Fact - Response - Threat - Psychopathic
'The fact that this normal physiological response to threat is reduced in psychopathic...
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