Correction

Abstract

; 10.1073͞pnas.2636971100), due to a printer's error, the first bar for the cell population CD25 Ϫ CD62L ϩ in Fig. 2 should be open instead of filled. The corrected figure and its legend appear below. COMMENTARY. For the article ''Slow-wave sleep, acetylcholine, and memory consolidation,'' by Ann E. Power, which appeared in issue 7, February 17, 2004, of Proc. Natl. Acad. Sci. USA (101, 1795-1796; first published Februar y 9, 2004; 10.1073͞ pnas.0400237101), the author notes that the phrase ''and associated with theta and gamma oscillations'' should be omitted from the first sentence of the center column on page 1795. The theta and gamma oscillations are related to information transfer during REM and not to slow-wave sleep. The sentence should have read ''Buzsaki (12, 13) has suggested that sharp wave bursts initiated in the hippocampus during SWS may provide the mechanism by which 'quanta' of information may be relayed back to the neocortex during memory consolidation.''