Correction

NEUROBIOLOGY. For the article “A caged Ab reveals an immediate/instructive effect of BDNF during hippocampal synaptic potentiation,” by Albrecht H. Kossel, Sidney B. Cambridge, Uta Wagner, and Tobias Bonhoeffer, which appeared in number 25, December 4, 2001, of Proc. Natl. Acad. Sci. USA (98, 14702–14707; First Published November 27, 2001; 10.1073/pnas.251326998), the authors note the following printer's error. In line 11 of the abstract and in the Abbreviations footnote, the term “τ-burst stimulation” should read “θ-burst stimulation.”