figure 3.18 Brain networks Recently developed brain imaging technologies enable researchers to see the networks that connect brain regions to one another. (The colors, added in the imaging process, identify fibers that connect similar brain regions.) As you can see, the connections are immensely complex. The structures of the brain are densely interconnected. Such images cause scientists to rethink earlier conceptions of the brain, which focused on the role of individual brain regions rather than the connections among them. “We’ve never really seen the brain,” said one. “It’s been hiding in plain sight.”