Fig. 2.

Mean difference images of relative rCBF increases from nine subjects superimposed on the composite structural MR image. The color bar indicates percent increase relative to whole-brain flow and has been fixed at a maximum of 12%. Right brain is on the right. Blue lines on the sagittal sections show the upper and lower limits of brain sampled in all nine subjects. Flow is elevated in thalamus (Thal), MPFC (MPF), right orbital prefrontal cortex (OPF), right globus pallidus (GP), right sensorimotor cortex (SMI), and periaqueductal gray (PAG).