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In the experiment, participants studied a total of 90 images in three categories -- celebrity faces, famous locations and common objects -- and then attempted to recall the images. Norman and his colleagues used Princeton's functional magnetic resonance imaging (fMRI) scanner to capture the participants' brain activity patterns as they studied the images. They then trained a computer program to distinguish between the patterns of brain activity associated with studying faces, locations or objects.

The computer program was used to track participants' brain activity as they recalled the images to see how well it matched the patterns associated with the initial viewing of the images. The researchers found that patterns of brain activity for specific categories, such as faces, started to emerge approximately five seconds before subjects recalled items from that category -- suggesting that participants were bringing to mind the general properties of the images in order to cue for specific details.

"What we have learned over the years is that what you get out of memory depends on how you cue memory. If you have the perfect cue, you can remember things that you had no idea were floating around in your head," Norman said. "Our method gives us some ability to see what cues participants are using, which in turn gives us some ability to predict what participants will recall. We are hopeful that, in the long run, this kind of work will help psychologists develop better theories of how people strategically cue memory, and also will suggest ways of making these cues more effective."

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Contact: Eric Quiones
quinones@princeton.edu
609-258-5748
Princeton University
22-Dec-2005