MRS voxel locations and spectra (semi-LASER, TE=26 ms, TR=5 s, 64
transients) are shown from a single subject in each group; subjects with SCAs
were at the premanifest stage (SARA ≤ 2.5). Arrows indicate type I error
corrected significant group metabolite differences in each early SCA group
compared to controls. [Abbreviations: Glc, glucose; Gln, glutamine; Glu,
glutamate; mI, myo-inositol; tCho, total choline; tCr, total creatine; tNAA,
total N-acetylaspartate; Tau, taurine].