Nature 527, 95–99 (2015); doi:10.1038/nature15526

In this Letter, author ‘Martin Alda’ was incorrectly listed as ‘Martin Alba’ owing to a production error. In addition, ‘Ketil J. Ødegaard’ should have been listed as ‘Ketil J. Oedegaard’ and their affiliation should have been ‘Division of Psychiatry, Haukeland University Hospital and Department of Clinical Medicine, Section for Psychiatry, University of Bergen and K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, 5021 Bergen, Norway’ rather than ‘Department of Psychiatry, University of Bergen, Bergen 5020, Norway’. These have been corrected in the online versions of the paper.