Fig. 3

Reacquisition of FR1. There was no significant difference between the strains in the number of days required to reach criterion on this stage (note that all SHR completed in 2 days and therefore the SEM = 0) (a). SHR did show an increased percentage of correct responses (b) but no difference in incorrect responses (c). However, the increase in correct responses was sufficient to result in a lower discrimination index in the SHR (d). There were also significant differences between the SHR and comparison strains for anticipatory responses (e), late responses (f) and total task activity (g). There were no strain differences for RT (h) but SHR did have reduce pellet collection times relative to the WIS (i). Representative key shown in b