Campus Studium - Knowledge Made Easy! Whether discussing emotional intelligence or emotions as a scientific subject of investigation, feelings have always been a topic in both science and society. For a long time, philosophy focused on human reason, considering wisdom and feeling to be incompatible. Today, however, emotions are a key category in the humanities, social sciences, and natural sciences. In his updated and expanded introduction, Martin Hartmann describes the development of emotion research since the late 19th century. He illustrates how, in philosophy and cognitive science, feelings are increasingly defined as "rational" and accepted as a basis for decision-making, incorporating psychological and neuroscientific approaches as well.