Figure 3.

Plots of parameter estimates (R–F) against memory performance (Pr) in regions showing an interaction of age group × drug × Pr. Point plots with fitted regression lines illustrate activity–performance relationships for peak voxels in MTL, left inferior PFC, and striatum. The x-axis shows Pr for each subject and drug condition; the y-axis shows the differences in the parameter estimates for the early covariate between remembered (R) and forgotten (F) items. The point plots were generated from individual values extracted from the peak voxels for each subject, and adjusted for confounding effects of Br using the regress function in MATLAB 6.5 (http://www.mathworks.com/), and plotted against Pr. The best fit lines to indicate the linear effects of drug at each voxel were computed separately, also using the regress function, and are plotted on the same axes.