In the article “Dynamic Analysis of Learning in Behavioral Experiments” by Anne C. Smith, Loren M. Frank, Sylvia Wirth, Marianna Yanike, Dan Hu, Yasuo Kubota, Ann M. Graybiel, Wendy A. Suzuki, and Emery N. Brown, which appeared on pages 447-461 in the January 14, 2004 issue, there were several errors in the summations that formed part of the intermediate working of Equations C.1-C.4 in Appendix C. These errors do not affect the final formulas or the results in Table 1. The corrected equations are as follows: 
C.1
C.2 
C.3 
C.4
