Table 1 Tissue composition for grey matter (GM), white matter (WM) and cerebrospinal fluid (CSF) and GABA concentration estimates for all three ROIs LMOT, RMOT (left/right primary motor cortex) and VIS (visual cortex).

GM

WM

CSF

GABA

31 ± 4

57 ± 6

11 ± 4

1.74 ± 0.34

29 ± 3

59 ± 9

10 ± 6

1.75 ± 0.29

58 ± 2

30 ± 4

11 ± 3

1.95 ± 0.38