Figure 8: The top panel shows the relation between preference in concurrent chains, measured as the logarithm of the ratio of initial-link responses, and the logarithm of the ratio of terminal-link reinforcer immediacy, for an individual pigeon. The center panel shows the relation between resistance to change in multiple-schedule components that were identical to the terminal links, measured as the logarithm of the ratio of response rate ratios with timeout food presentations to baseline, and the logarithm of the ratio of multiple-schedule reinforcer immediacy. The lower panel shows the structural relation between resistance to change and preference. Adapted from Grace and Nevin (1997).