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When the highly psychopathic individuals imagined the accidents happening to themselves, their brains lit up in the anterior insula, the anterior midcingulate cortex, the somatosensory cortex and the right amygdala - all areas involved in empathy. The response was quite pronounced, suggesting psychopathic individuals were sensitive to thoughts of pain.In short, what we are up against is a species who lacks empathy and takes pleasure in our pain. And that accounts for all the insanity we see unfolding around us everyday.
But when the highly psychopathic inmates imagined the accident happening to others, their brains failed to light up in the regions associated with empathy. In fact, an area involved in pleasure, the ventral striatum, lit up instead.
Comment: For more information, see Ran Gavrieli's talk at Ted. He lives in Tel Aviv and studies gender at Tel Aviv University: