“We wanted to test the hypothesis that these various stimulation sites are actually different spots within the same brain network,” explains Fox. “To examine the connectivity from any one site to other brain regions, we used a data base of functional MRI images and a technique that enables you to see correlations in spontaneous brain activity.” From these correlations, the investigators were able to create a map of connections from deep brain stimulation sites to the surface of the brain. When they compared this map to sites on the brain surface that work for noninvasive brain stimulation, the two matched.

via New clues revealed to understand brain stimulation — ScienceDaily.