Key points Sadistic personality disorder is no longer in the DSM, but it's still recognized by personality aficionados. The chief component of sadistic personality is taking pleasure in cruel, ...

A new study published in Chronobiology International suggests that night owls tend to exhibit higher levels of everyday sadism. Researchers provide evidence that a natural preference for staying up ...

In psychology, we tend to avoid qualitative personal descriptors, especially evil—even though it's one of the most heavily discussed topics in the history of discussing anything. What is it? While ...