Both autism and psychopathy entail a lack of empathy. Psychologists, though, distinguish between….

Both autism and psychopathy entail a lack of empathy. Psychologists, though, distinguish between the “cognitive empathy” deficits of autism (difficulty understanding what emotions are, trouble interpreting other people’s nonverbal signs) and the “emotional empathy” deficits of psychopathy (lack of concern about hurting other people, an inability to share their feelings). The subgroup of people with neither kind of empathy appears to be small, but such people may act out their malice in ways that can feel both guileless and brutal.

Andrew Solomon, “The Reckoning”, The New Yorker (17 March 2014), 40.