Table 1.

List of the regions of interests (ROI) and relative details (anatomical location, coordinates, according to the Montreal Neurological Institute coordinate system (MNI), of the centroid and radius of the sphere) added to the customised atlas considered for the seed-based correlation analysis.

ROI Location	MNI Coordinates (x,y,z)	r (mm)
Left Dorsal Pons [26]	−8 −24 −32	5
Right Dorsal Pons [26]	8 −24 −32	5
Left PAG [29]	−2 −28 −6	3
Right PAG [29]	4 −28 −6	3
Hypothalamus [30]	0 2 −6	3
Left Spinal Trigeminal Nucleus, Pars Caudalis [13]	4 −40 −55	3
Right Spinal Trigeminal Nucleus, Pars Caudalis [13]	−4 −40 −55	3
Dorsal Raphe Nucleus [31]	0 −28 −12	3