Correction to: Molecular Psychiatry advance online publication, 31 January 2012; doi:10.1038/mp.2011.185

Following the online publication of this article, the authors identified an error: only 60% of patients with ADHD (N=12) were medication-naïve, while the other 40% (N=8) were free of psycho-stimulant medication (Methylphenidate: 5 Concerta; 3 Equasym) for 36 h, more than 9 times the half-life of the drug.