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. Author manuscript; available in PMC: 2010 Nov 1.
Published in final edited form as: Neurobiol Aging. 2008 Nov 25;31(11):1991–2001. doi: 10.1016/j.neurobiolaging.2008.10.009

Fig. 1.

Fig. 1

Illustration of combining functions (S1 and S2) that define critical regions of concordant changes between two DTI measures, such as fractional anistropy (FA) and mean diffusivity (MD) on a map of T-statistic values. (A) Simultaneous changes of DTI measures in the same directions (i.e. both measures increase or decrease); (B) Simultaneous changes of DTI measures in opposite direction (i.e. one measure increases whereas the other decreases).