Abstract

This article explores the evolution of a major longitudinal ‘high risk for schizophrenia’ research programme, started over 50 years ago, which has been largely ignored in recent debates over ‘psychosis risk’ and early intervention. Studying mainly the offspring of individuals with schizophrenia, high-risk investigators aimed to identify a range of precursors of schizophrenia in the hope that the findings would eventually facilitate effective primary prevention. Specifically, the article examines the origins and impact of the pioneering Copenhagen High-Risk Project (1962–1989) and thus provides an important contribution to the sparse historical literature on schizophrenia research, including the study of milder conditions and at-risk states in the borderlands of psychosis.