Correction

NEUROBIOLOGY. For the article “Dopamine D1/D5 receptor modulation of excitatory synaptic inputs to layer V prefrontal cortex neurons” by Jeremy K. Seamans, Daniel Durstewitz, Brian R. Christie, Charles F. Stevens, and Terrence J. Sejnowski, which appeared in number 1, January 2, 2001, of Proc. Natl. Acad. Sci. USA (98, 301–306; First Published December 26, 2000; 10.1073/pnas.011518798), the authors note the following correction. Line 10 of the abstract should read: “With 20 Hz synaptic trains we found that the D1/D5 agonists increased the depolarization produced by summating NMDA excitatory postsynaptic potentials (EPSPs).” In addition, on line 3 of page 305, “signal” should be “single.”