The researchers, who are based at University College London, set up a computer game in which study subjects could win money. Players saw strange, complex symbols on a computer screen, and were told to predict which symbols consistently led to payout, and which led to penalty. Yet it was impossible to tell the symbols apart. The researchers designed them to look, to the conscious mind, identical. "Just follow your gut feelings," the game instructions coached, "and you will win, and avoid losing, a lot of pounds!" Despite the challenge, subjects did manage to learn how to win—guided, apparently, by their instinct.