In the article “Synaptic Cooperativity Regulates Persistent Network Activity in Neocortex” by Morgana Favero and Manuel A. Castro-Alamancos, which appeared on pages 3151–3163 of the February 13, 2013 issue, the authors regret a typographical error. Everywhere in the article where it mentions the AMPA-receptor antagonist “GYKI35348”, it should say “GYKI53655.” This correction does not affect the results or conclusions of the paper.