Citalopram’s effect on response inhibition was also related to the strength of structural connectivity (fractional anisotropy, FA) between the frontal cortex and striatum, showing a negative correlation of the drug-induced SSRT change (ΔSSRT) with fractional anisotropy of the skeleton voxels in the right internal capsule (mean centred). Thresholded at P < 0.05 TFCE-corrected.