While I am very aware of my limited ability to evaluate a study such as this, and that matching up one's own subjective symptoms with an imperfect study and extrapolating from minimal information is obviously quite foolish... I must say that, as a person with gradual onset ME and a lot of cognitive issues (indeed, I would characterize my symptoms as primarily cognitive), this is pretty damn discouraging, especially as reading about the sort of damage associated with low axial diffusivity seems to match up pretty damn well for me.
Not that it matters.