Figure 7.

Functional MRI (fMRI) study of the effects of a DC lesion on blood volume changes evoked in the brain after noxious distention of the colon in monkeys. (Left) The brain slices shown were taken from a monkey that was subjected to sham surgery at T10. The fMRI images were from a comparable location before (Upper) and then 4 months after the sham surgery (Lower). (Right) The images were made before and 4 months after a DC lesion at T10 in a different monkey. Colored regions indicate locations where regional cerebral blood volume increased relative to the nonstimulated state.