Fig. 1. In vivo localized correlated spectroscopy (L-COSY) of the human brain (posterior cingulate gyrus) acquired at 3 T using a 64-channel head coil; voxel size, 30 × 30 × 30 mm³; increment size, 0.8 ms; increments, 96; 8 averages per increment; TR =  1.5 s; total experimental time: 19 min; acquired vector, 1024 points; spectral width in F2, 2000 Hz; spectral width in F1, 1250 Hz. Abbreviations: t-Fucose, total-Fucose; Asp, aspartate; Cho, choline; Cr, creatine; Glx, glutamate and glutamine together; m-Ino, myo-inositol; NAA, N-acetylaspartate.

The region highlighted by the white box is expanded in Fig. 2 . Upper spectrum—healthy control, lower spectrum—participant with PTSD