This article examines the use of cinematic microanalysis to capture, decompose, and interpret mother–infant interaction in the decades following the Second World War. Focusing on the films and writings of Margaret Mead, Ray Birdwhistell, René Spitz, and Sylvia Brody, it examines the intellectual culture, and visual methodologies, that transformed ‘pathogenic’ mothering into an observable process. In turn, it argues that the significance assigned to the ‘small behaviours’ of mothers provided an epistemological foundation for the nascent discipline of infant psychiatry. This (...) research draws attention to two new areas of enquiry within the history of emotions and the history of psychiatry in the post-war period: preoccupation with emotional absence and affectlessness, and their personal and cultural meanings; and the empirical search for the origin point, and early chronology, of mental illness. (shrink)