Pick a photo, any photo

By Ewen Callaway, 15:58 PM April 15, 2008

The guessing game 20 Questions might be won with a quick scan of an opponent's brain. Researchers have developed a way to measure how the human brain reacts to pictures—and to predict what images people are gazing at.

Though a long way off, the technology could help scientists reconstruct dreams or repressed memories, says Jack Gallant, a neuroscientist at the University of California, Berkeley, who led the study, published in the March 20 Nature.

As a first step, two members of Gallant's team...

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