 Philosophically more influential has been the study of empathy defined primarily as an emotional or affective phenomenon, which psychologists in the middle of the 1950’s started to focus on. In this context, psychologists have also addressed issues of moral motivation that have been traditionally topics of intense discussions among moral philosophers. They were particularly interested in investigating (i) the development of various means for measuring empathy as a dispositional trait of adults and of children and as a situational response in specific situations, (ii) the factors on which empathic responses and dispositions depend, and (iii) the relation between empathy and pro-social behavior and moral development. Before discussing the psychological research on emotional empathy and its relevance for moral philosophy and moral psychology in the next section, it is vital to introduce important conceptual distinctions that one should keep in mind in evaluating the various empirical studies.