French philosopher whose study of the psychology of primitive peoples gave anthropology a new approach to understanding irrational factors in social thought and primitive religion and mythology.

Lévy-Bruhl was professor of philosophy at the Sorbonne from 1899 to 1927. His first major work, La Morale et la science des moeurs (1903; Ethics and Moral Science), reflected the positivism of Auguste Comte. Contending that theoretical moralities cannot prevail, this book laid the groundwork for a pluralistic, relativistic sociology. Much of his subsequent attention was devoted to the mentality of people in so-called primitive societies, which he first examined at length in Les Fonctions mentales dans les sociétés primitives (1910; How Natives Think). From the French sociologist Émile Durkheim he adopted the concept of représentations collectives, or group ideas, which account for differences in reasoning between people in primitive societies and those in modern Western ones. He suggested that primitive thought and perceptions are pervaded by mysticism and that the primitive mentality, though not opposed to the laws of logic, is not governed exclusively by them.

Lévy-Bruhl continued his examination of primitive mentality and transitional stages in several other works, including La Mentalité primitive (1922; Primitive Mentality), L'Âme primitive (1927; The “Soul” of the Primitive), and Le Surnaturel et la nature dans la mentalité primitive (1931; Primitives and the Supernatural).