Correction to: Molecular Psychiatry, advance online publication, 29 October 2013; doi:10.1038/mp.2013.120

Following publication of the above article, the authors noticed that there was an error in the first sentence of the Results section. The correct statement appears below.

On average, participants played 50.2 h (s.d.=14.6) in total, amounting to about 50 min per day and obtained 74.7 (s.d.=37.4) stars.