"The concept of folk psychology has played a significant role in philosophy of mind and cognitive science over the last half century. However, even a cursory examination of the literature reveals that there are at least three distinct senses in which the term “folk psychology” is used. (1) Sometimes “folk psychology” is used to refer to a particular set of cognitive capacities which include—but are not exhausted by—the capacities to predict and explain behavior. (2) The term “folk psychology” is also used to refer to a theory of behavior represented in the brain. According to many philosophers and cognitive scientists, the set of cognitive capacities identified above are underpinned by folk psychology in this second sense. (3) The final sense of “folk psychology” is closely associated with the work of David Lewis. On this view, folk psychology is a psychological theory constituted by the platitudes about the mind ordinary people are inclined to endorse."