In the article “Precise Long-Range Synchronization of Activity and Silence in Neocortical Neurons during Slow-Wave Sleep” by Maxim Volgushev, Sylvain Chauvette, Mikhail Mukovski, and Igor Timofeev, which appeared on pages 5665–5672 of the May 24, 2006 issue, the authors examined slow wave oscillations in anesthetized animals. Thus to avoid confusion, the article would have been more accurately titled as “slow wave oscillations” rather than “slow wave sleep.”