Empathy, defined as the ability to understand others emotions, is a fundamental concept in social interactions. It is a psychological phenomenon involving various separable components : (i) the ability to feel and imagine the emotions, (ii) the ability to adopt the perspective of other people. Several neurological diseases with behavioral disorders may lead to impaired processing of social and/or emotional informations. These pathologies are likely to induce a lack of empathy that may result from impairments at different levels.