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How do different parts of the brain work together to help us see, move, understand, and do other things? For many years, we have known that different brain regions perform different tasks that are important for vision. Some brain regions are responsible for seeing faces, colors, lines, movement, or other parts of the world. But mapping different brain regions in detail is very challenging, especially because everyone’s brain is slightly different. Sometimes, brain surgeons must place electrodes inside a patient’s skull—on the surface of the brain—to get a more detailed map. This article describes a study done by a group of brain surgeons, scientists, and engineers. We studied the activity of a patient’s brain while he looked at different objects. We identified two brain regions that were active when the patient processed faces or colors. If we stimulated these areas, the patient reported seeing faces or colors, even if he was looking at something else! The results of this study help show how different parts of the brain perform different tasks, and could lead to safer, more precise brain surgery.

How Can We Trick the Brain Into Seeing Rainbows and Faces?