In the article “Serotonin Modulates Striatal Responses to Fairness and Retaliation in Humans” by Molly J. Crockett, Annemieke Apergis-Schoute, Benedikt Herrmann, Matt Lieberman, Ulrich Müller, Trevor W. Robbins, and Luke Clark, which appeared on pages 3505–3513 of the February 20, 2013 issue, there is a misspelling of the fourth author first name. The corrected author line is: Molly J. Crockett, Annemieke Apergis-Schoute, Benedikt Herrmann, Matthew D. Lieberman, Ulrich Müller, Trevor W. Robbins, and Luke Clark which has been corrected on the online PDF version.