Psychopaths have terrible senses of smell

… people with such traits have decreased function in the brain's frontal lobes, and dysfunction in that part of the brain is associated with an impaired sense of smell.

Criminal psychopaths' speech patterns can also give them away, according to research??presented in 2011. When speaking of their crimes, psychopaths use less emotion and focus more on their basic needs than non-psychopaths, that research found.??

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