Table 1. Percent HP ¹²⁹Xe signal change in four brain regions^*.

	Cingulate	SS1 fl	SS1	SS2
A1	76.72	6.19	16.45	12.33
A2	40.70	42.69	27.65	5.05
A3	31.37	112.59	67.93	−14.07
A4	−26.07	−15.06	0.44	106.17
A5	23.23	−9.31	0.32	−24.77
A6	22.82	24.87	21.71	4.32

*Measured from regions of interest (ROIs) in hemisphere contralateral to pain stimulus.