The cerebral cortex is the seat of advanced human faculties such as language, long-term planning, and complex thought. Research over the last 60 years has shown that some parts of the cortex have very specific roles, such as vision (visual cortex) or control of our limbs (motor cortex). While categorizing different parts of the cortex according to their most apparent roles is convenient, it is also an oversimplification. Brain areas are highly interconnected, and studies over the past decade have shown...