Figure 4: The logarithms of ratios of the slopes of functions relating response rates in the components of a multiple VI VI schedule to sessions of prefeeding (PF) or extinction (Ext), as functions of the logarithm of the ratio of contingency ratios or, equivalently, the log ratio of reinforcer rates in those components. Results are shown separately for conditions with 2-second and 2-minute timeouts between components. Adapted from Nevin (1992a).