Group mean ± S.E. values for percent correct (accuracy) during the repeated leaning (top) and performance (bottom) components of the multiple schedule of RL and P schedule across sessions for groups exposed to maternal Pb and PS. Values represent averages of RL1 and RL2 and P1 and P2. Group sample sizes were 9, 10, 7 and 10 for the 0-NS, 0-PS, 150-NS and 150-PS groups, respectively. Pb x stress x session = interaction from the repeated measures ANOVA.