NEUROBIOLOGY. For the article “Coupling between changes in human brain temperature and oxidative metabolism during prolonged visual stimulation” by Dmitriy A. Yablonskiy, Joseph J. H. Ackerman, and Marcus E. Raichle, which appeared in number 13, June 20, 2000, of Proc. Natl. Acad. Sci. USA (97, 7603–7608), the authors note a correction in the second to last paragraph on page 7604. The sentence “It is well known from positron-emission tomography (PET) data (17, 18) that rCMRO₂ maps in the normal human brain are largely flat despite considerable regional differences in rCBF and rCMRO₂ maps” should read: “It is well known from positron-emission tomography (PET) data (17, 18) that rOEF maps in the normal human brain are largely flat despite considerable regional differences in rCBF and rCMRO₂ maps.”