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It, too, evokes dreams, Stickgold said. "I play Tetris, that is all I see going to sleep," he said.
Strange images follow bouts with computer game
People in both groups reported that, as they fell asleep, they dreamed about images of blocks falling and rotating, as they do on the computer screen when the game is in progress. They did not actually dream about the game itself.
The amnesia patients did not remember playing the game and they did not ever improve, unlike the volunteers with normal memory. Three of them did report the strange dreams, however.
"What these results, especially from the amnesics, tells us is that when the brain puts dreams together, it does it without knowledge of and access to memories of actual events in our life," Stickgold said.
"We have two different memory systems. The hippocampal codes information on events from our lives. So when I ask you what did you have for breakfast, you go to the hippocampus for the answer," he added.
"A second system is the neocortical," he said, referring to another area of the brain.
"So when I ask you when we go out for breakfast 'what do you like for breakfast?', that is a different type of question. When you go for that general information you go to neocortex. An amnesic can tell you what they like for breakfast. They can't tell you what they had for breakfast."
This is because their hippocampus is damaged. The findings suggest that the brain does not go to the hippocampus to get images for dreams, but to the long-term, neocortical system, the researchers said.