Nat. Neurosci. 18, 1493–1500 (2015); published online 31 August 2015; corrected after print 5 October 2015

In the version of this article initially published, the grant number for U.R. was given as R01MH80006 instead of R01MH080006 and grants to J.M.C. from the National Institute of Neurological Disorders and Stroke (R01NS076517) and the National Institute of Mental Health (R01MH096463), US National Institutes of Health, were missing. The error has been corrected in the HTML and PDF versions of the article.