Shaw Bronner, left, and Shaul Yahil, two researchers at the Yale Brain Function Lab, describe images on their computer screens to each other while their brain activity is mapped during a demonstration of the technology in New Haven, Conn. on Friday, March 13, 2015. At one end of each of the 64 fiber optic cables in each headpiece, weak laser beams saw about an inch into their brains to detect blood flow. (AP Photo/Richard Drew)
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