A marked lack of empathy is one of the hallmarks of psychopathy. Psychopaths do not have the same capacity for human feeling as the rest of us; they do not appear moved by the things that usually deeply affect others, such as seeing fellow human beings suffer or in distress. And this is perhaps why they do not experience genuine remorse for the hurt and misfortune that they inflict. ‘Explaining the lack of empathy’ discusses some of the tasks that researchers use when they try to understand why adult psychopaths or children at risk of developing psychopathy lack empathy. Findings from this research give us possible explanations for the uncaring and antisocial behaviour of these individuals.