Fig. 4.

Voxelwise comparisons between the correlation maps of F-DOPA K_i with BOLD signal in young versus older adults. (A) During reward anticipation, between-group voxelwise comparisons of the correlation maps revealed that the slopes of the correlations in young subjects were significantly greater than those in older subjects (in whom the correlations were negative; see Fig. 3) in the lateral PFC. (B) At the time of reward outcome, between-group voxelwise comparisons of the correlation maps showed that the slopes of the correlations in young subjects were significantly greater than the negative correlation in older subjects (see Fig. 3) in the bilateral PFC and left temporoparietal junction.