Fig. 4

fMRI analyses comparing PD-MCI and PD-CN. These images show the results for the 0-back test (A), 1-back test (B), 2-back test (C), and subtracting the activated regions in the 0-back test from those in the 2-back test (2-back versus 0-back condition) (D). The coloured regions indicate significantly lower brain activation in PD-MCI, as compared with PD-CN. The colour-bar represents t values as reference. All the images presented at P < 0.01 (uncorrected) with cluster size > 50 voxels in analysis