MR spectroscopy of the auditory cortex. (A) Anatomical transverse MR image of the left auditory cortex with the superimposed borders of the MRS voxel (1.5 × 1.5 × 1.5 cm3). The image shows the anterior borders of the voxel, which extends 1.5 cm in the posterior direction. (B) 1H-MRS spectrum from the auditory cortex of a single subject. NAA denotes N-acetylaspartate; Glx, glutamate/glutamine; Cr, creatine/phosphocreatine; Cho, choline-containing compounds. The original and the fitted spectrum (using the linear combination model, black line) are displayed.