Figure 3. Correlation between dopamine (DA) levels in core and medial shell of nucleus accumbens (NAc) and performance of core (plus shell) lesioned (CL) and shell-lesioned (SL) animals on a test of object recognition memory after delays of 24 hr (top half) and 5 min (bottom half). DA levels are presented as a proportion of sham levels. Test performance is the discrimination ratio. The best fit slopes correspond to the Pearson correlations. The partial correlations (controlling for DA levels in the adjacent accumbal region) are presented in the boxes.