Nevin, J. A., & Shahan, T. A. (2011). Behavioral momentum theory: Equations and applications. Journal of Applied Behavior Analysis, 44, 877–895.
The simulations portrayed in Figures 11 and 13 of Nevin and Shahan (2011) were based on calculations that differed from the other simulations in that article. Specifically, Figures 11 and 13 employed e, the base of natural logarithms, whereas all other simulations employed 10, the base of common logarithms (see Nevin & Shahan, 2011, p. 879, Footnote 3). Corrected figures with base 10, displayed below, have lower y-axis values than the published figures. However, the ordinal effects of reinforcer schedules on behavioral predictions are unchanged from those shown in the original figures and discussed in the text.
We are indebted to Wayne Fisher for pointing out the discrepancies between the proper simulations and the published figures.