The phrase "dark triad" has been used by psychologists to refer to narcissists, Machiavellians, and sociopaths. They can be good at cognitive empathy but lack emotional empathy and empathetic concern. They represent the dark side of emotional intelligence. (Damasio, Antonio. A Neural Basis for Sociopathy. Archives of General Psychiatry 57, 2000, 128-129)

Studies have shown that sociopaths have deficits in several brain areas key to emotional intelligence: the anterior cingulate, the orbitofrontal cortex, the amygdala, and insula. There are also deficits in the connectgivity of these regions to other parts of the brain. There are extreme sociopaths known because of their cold-blooded crimes. There are also less extreme types. For example:

  1. Bullying boss - charming to superiors but a tyrant to direct reports and others
  2. Embezzler - a crook such as Bernie madoff
  3. Freeloader - may be a schmoozer but does very little actual work

(Goleman, Daniel. The Brain and Emotional Intelligence: New Insights. p.66-67. MA: More Than Sound, 2011)