Corrections and clarifications

In reference 12 (p. 996) of the Perspective "Neuroscience on the net" by P. T. Fox and J. L. Lancaster (11 Nov., p. 994), errors appeared in three of the Uniform Resource Locators (URL's) listed. For BrainMap, the URL should have read, "http://biad 38.uthscsa.edu/brainmap/brainmap94.html"; for ICBM/SPMap, "http://www.loni.ucla.edu"; and for Genesis, "http://www.bbb.caltech.edu/GENESIS."