At the very beginning, the written version of the word was available, but afterwards the volunteers were asked to identify the word just depending on the sound they heard.
Tests showed that the ability to remember the right word tended to weaken 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 strengthens memories, protecting them against later interference (干扰) or decay (衰减).”
“Sleep also appears to ‘recover’ or restore memories.” He said “If the function of memory 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 experiencing a transformation -- no longer is memory thought to be a hardware of the brain, instead it seems to be a process of storage and re-storage. Sleep helps some memories ‘fully grown up’ and also removes unimportant memories.”
46. What tends to happen to a person at the end of the day according to the report?
A. He may feel tired.
B. He may feel sleepy.
C. His memory weakens.
D. His brain stops working.
47. What can be kept in one’s memory more permanently?
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