The images you see as you nod off provide tantalizing clues about the relationship between dreams and memory, according to a report in the journal Science. Researchers at Harvard Medical School said they were surprised to find that people with amnesia could dream about an event that happened to them even though they had no waking memory of it.

The discovery suggests that different types of memories are processed in different parts of the brain, said Dr. Robert Stickgold, associate professor of psychiatry at Harvard and lead author of the study. Stickgold and his research team had 27 people, including five amnesiacs play the computer game Tetris for seven hours spread out over three days, and then report their dreams during the first hour of sleep on each of those nights.

Like two-thirds of healthy participants, three of the five amnesiacs described dreams similar to the game even though they could neither recall playing it.



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