NEUROSCIENCE Correction for “A unifying model for timing of walking onset in humans and other mammals,” by Martin Garwicz, Maria Christensson, and Elia Psouni, which appeared in issue 51, December 22, 2009, of Proc Natl Acad Sci USA (106:21889–21893; first published December 14, 2009; 10.1073/pnas.0905777106).
The authors note the following statement should be added to the Acknowledgments: “We also acknowledge the support of The Knut and Alice Wallenberg Foundation (Project KAW 2004.0119) and the Medical Faculty at Lund University.”