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Quality Sleep "Rescues Memories"
Even facts "forgotten" by people during a busy day may be retrieved if this is followed by a good night's sleep.
Researchers from the University of Chicago asked volunteers to remember simple words. Many found their memories letting them down1 towards the end of the day, but the following morning, those who had slept well could recall much more .
Researchers, writing in the journal Nature2, said the brain could"rescue"lost memories during the night.
When the brain is first asked to remember something, that memory is laid down in an " unstable "state , meaning that it is possible that it could be lost. At some point, the brain consolidates those it deems important into a" stable ", more permanent state. However,the Chicago researchers suggested that it was possible for a" stable "memory to be made " unstable"again. This would mean that memories could be modified then filed away again in the face of new experiences.
The 12 volunteers tested in the experiment were played words created through a speech synthesizer which were purposely difficult to understand. Initially, the written version of the word was available , but afterwards the volunteers were asked to identify the word from the audio version only. Tests revealed that the ability to recall the right word tended to tail off3 as the day ended.
However, when the volunteers were retested after a good night's sleep , they were able to recall some words that they had" forgotten"the previous evening. Dr Daniel, one of the study authors, said:"Sleep consolidates memories, protecting them against subsequent interference or decay. Sleep also appears to'recover'or restore memories. "He said :" If performance is reduced by decay, sleep might actively recover what has been lost. "
Dr Karim Nader, from the Department of Psychology in McGill University in Montreal, said:"Memory research is undergoing a transformation — no longer is memory thought to be a hard-wiring of the brain, instead it seems to be a process of storage and restorage. "
Sleep helps some memories"mature"and also prunes out unimportant memories.
练习题：
Ⅰ. True or False:
1. Researchers asked volunteers from the University of Chicago to remember simple words.
2. The 12 volunteers tested in the experiment played word games.
3. The volunteers can see and hear the words first, then they can hear them only.
4. Sleep makes memories powerful, protecting them against later harm.
Ⅱ. Question:
Who compares memories with the process of storage and restorage?
