In the October 2009 article “Lower Level of Endogenous Dopamine in Patients With Cocaine Dependence: Findings From PET Imaging of D2/D3 Receptors Following Acute Dopamine Depletion” by Diana Martinez, M.D., et al. (Am J Psychiatry 2009; 166:1170–1177), the contribution of an individual was omitted from the acknowledgment text. It should read as follows: “The authors would like to thank Lawrence Kegeles and Anissa Abi-Dargham for their assistance with implementing the AMPT administration paradigm, and Richard Foltin for discussions regarding the implementation of this challenging protocol.” In addition, the full name of the center that made the research possible and where the participants were admitted should have been given. It is the Irving Center for Clinical and Translational Research.