Nat. Neurosci. 12, 1229–1237 (2009); published online 13 September 2009; corrected after print 25 September 2009

In the version of this article initially published, one of the corresponding authors' email addresses was misspelled. It should be luisapinto@ecsaude.uminho.pt. In addition, errors occurred in some of the numbers listed in the last subsection of the Results section. Instead of “Notably, AP2γ−/− mice also showed alterations in cortical binocularity (Fig. 7c,d and Supplementary Table 2) and a tendency toward an increased latency of visual response (wild type = 109.95 ms, AP2γ−/− = 127.19 ms; Supplementary Table 2). [...] Indeed, monocular deprivation for 3 d caused a significant change in binocularity in adult AP2γ−/− (P = 0.027), but not wild-type (P = 0.365), mice (Fig. 7d),” the affected sentences should read, “Notably, AP2γ−/− mice also showed alterations in cortical binocularity (Fig. 7c,d and Supplementary Table 2) and a tendency toward an increased latency of visual response (wild type = 110.0 ± 3.8 ms, AP2γ−/− = 127.2 ± 6.4 ms; t-test, P = 0.05; Supplementary Table 2). [...] Indeed, monocular deprivation for 3 d caused a significant change in binocularity in adult AP2γ−/− (P = 0.01), but not wild-type (P = 0.365), mice (Fig. 7d).” The errors have been corrected in the HTML and PDF versions of the article.