Fig. 3: Positive correlation between baseline K* values and OCD symptom improvement.

Statistical parametric maps (SPM12), with an anatomical MRI overlay, demonstrating brain regions where pre-treatment K* values correlated positively with ΔY-BOCS in the whole sample of OCD patients (n = 15). The t-map threshold was 3.85, with p = 0.001 and an extent threshold of 50 voxels. A significant cluster was found in the right rostral raphe nuclei (t13 = 6.66, k = 67 voxels, coordinates x, y, z = 6, −20, −22 mm)