Brain Neurons Are Well Organized, Not Spaghetti Cables

They tested the randomness hypothesis. Researchers at Max Planck, Rockefeller, and Duke Universities examined the connections in brain tissue from the visual cortex, the first stop for information coming in from the retina. It was a tall order. A news item from Max Planck, "No cable spaghetti in the brain," describes the cabling nightmare:

Nerve cells in the human brain are densely interconnected and form a seemingly impenetrable meshwork. A cubic millimeter of brain tissue contains several...