Nat. Neurosci. 14, 1245–1246 (2011); published online 18 September 2011; corrected after print 13 October 2011

In the version of this article initially published, the institute identifier was omitted from the INSERM affiliation of author Michel Thiebaut de Schotten. The correct affiliation should read Unité Mixte de Recherche (UMR) S 975. The error has been corrected in the HTML and PDF versions of the article.