Fig. 2.

Relationships of total WMH and gray matter volumes to perceptual speed. Left panel (a) level of perceptual speed as a function of total WMH volume (on a geometric axis) in a linear regression model without controlling for total gray matter volume (WMH only model) and in a model controlling for total gray matter volume (WMH and gray matter model). Right panel (b) level of perceptual speed as a function of total gray matter volume in a linear regression model without controlling for total WMH volume (gray matter only model) and in a model controlling for total WMH volume (WMH and gray matter model). All models and data values are adjusted for age, sex, and education. WMH volumes were analyzed and adjusted in log-10 scale