Correction

PSYCHOLOGY. For the article “The role of prefrontal cortex and posterior parietal cortex in task switching” by Myeong-Ho Sohn, Stefan Ursu, John R. Anderson, V. Andrew Stenger, and Cameron S. Carter, which appeared in number 24, November 21, 2000, of Proc. Natl. Acad. Sci. USA (97, 13448–13453; First Published November 7, 2000; 10.1073/pnas.240460497), the authors note the following correction. In Tables 2 and 3, signs of x coordinates are reversed. The x coordinates of regions located in the left hemisphere should be negative, and the x coordinates of the regions in the right hemisphere should be positive.