Fig. 3
From: Older is order: entropy reduction in cortical spontaneous activity marks healthy aging
Aging patterns of hierarchical entropy in the human cerebral cortex. A three-level hierarchy of the cerebral cortex is used to extract mean entropy values for fitting the trajectories of primary (the 1st order), intermediate (the 2nd order), and association (the 3rd order) areas by GAMM, which generated the aging curves for the three hierarchies as indicated in the corresponding colors in the DU15NET cortical hierarchical parcellation. Accordingly, the rank of complexity level of the three hierarchies from five different ages (58, 64, 70, 76, and 82) were rendered as lateral and medial surfaces at the bottom