Nature Rev. Neurosci. 6, 97–107 (2005) Reference 18 in this article was omitted. This reference is Pasternak, T. & Zaksas, D. Stimulus specificity and temporal dynamics of working memory for visual motion. J. Neurophysiol. 90, 2752–2757 (2003). Also in this article, in the sentence “Sekuler and colleagues used a different approach to examine the nature of stimulus representation in memory22,23” we should not have referred to reference 23, but to a reference that was omitted.