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Comparison of odor-induced brain activation in DPN and NDPN. Olfactory-related regions of the brain were activated after odor stimulation in DPN (A) and NDPN (B). Significantly decreased brain activation was demonstrated in DPN compared to NDPN (with GRF correction, voxel level: P < 0.001, cluster level: P < 0.05, cluster size threshold: 51 voxels) (C). β value is decreased in the left frontal lobe in DPN (D and E). Independent sample t test. ***P < 0.001. L, left; R, right.
