Subjects who dreamed about video game did better playing it a second time
THURSDAY, April 22 (HealthDay News) -- Humans have long tried to figure out why we dream. In recent years, controversial research has suggested that we process our memories by dreaming. Now, a new study suggests that dreams also play a role in learning by processing what we've just experienced.
Researchers found that people who dreamed about a maze video game they'd just played did better the next time they tackled it, compared to those who didn't dream about it.
"There are parts of their brain which are actually replaying the memory of walking through the maze, and that will improve that memory and lead to a better performance," said study co-author Robert Stickgold, director of Harvard Medical School's Center for Sleep and Cognition.
Dreams have fascinated people for ages. "We started out a few thousand years ago thinking they were messages from God," Stickgold said. "Then Freud came along and said they're messages from our pernicious, immoral subconscious."
Scientists later thought dreams were "random firings of nerves in the brain stem," Stickgold said. Now, he said, "we're starting to say that at one level, as we've all sort of known all along, it's doing something with our memories."
In the new study, published online April 22 in the journal Current Biology, researchers asked 99 subjects to play a video game in which they had to find their way through a maze with the help of a three-dimensional depiction of it.
Then the participants either stayed awake for two hours or took a nap. They played the maze game again five hours later.
Four participants reported dreaming about the maze while they napped. They were among those who improved the most when they played the maze game for the second time, improving 10 times as much as others who napped.
So did the dreamers learn as they dre
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