Table 2.

Brain regions showing significant rCBF changes in response to the stimuli.

Group	Contrast	Cluster size (# voxels)	Cluster P-value	Local maxima
				Z	x (mm)	y (mm)	z (mm)	Label
				RA	low stimulus > baseline	3714	0.0023	4.96	22	12	52	R superior frontal sulcus
3.58	10	10	52					R pre-supplementary motor area
3.56	0	2	42					anterior middle cingulate cortex
3.41	−4	4	46					L anterior middle cingulate cortex /pre-supplementary motor area
3.11	32	−12	56					R precentral gyrus
baseline > low stimulus	n.s.
high stimulus > baseline	4078	0.00161	3.55		8	48	12	R pregenual anterior cingulate cortex
			3.34		10	22	44	R pre-supplementary motor area
			3.08		−6	48	12	L pregenual anterior cingulate cortex
			3.04		−16	22	46	L superior frontal sulcus
			2.7		−10	24	40	L pre-supplementary motor area
baseline > high stimulus	n.s.
controls	low stimulus > baseline	n.s.
	baseline > low stimulus	1951	0.0336	3.34	−38	58	14	L frontal pole
				3.22	2	58	10	R medial prefrontal cortex
				3.04	−30	32	38	L middle frontal gyrus
				2.89	10	58	32	R frontal pole
	high stimulus > baseline	n.s.
	baseline > high stimulus	n.s.