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Source: Official Guide Revised GRE 2nd Ed. Part 9; Section 3; #12


According to the author of the passage

According to the author of the passage, which of the following generalizations about memory and sleep is true? Some researchers contend that sleep plays no role in the consolidation of declarative memory (i.e., memory involving factual information). These researchers note that people with impairments in rapid eye movement (REM) continue to lead normal lives, and they argue that if sleep were crucial to memory, then these individuals would have apparent memory deficits. Yet the same researchers acknowledge that the cognitive capacities of these individuals have never been systematically examined, nor have they been the subject of studies of tasks on which performance reportedly depends on sleep. Even if such studies were done, they could only clarify our understanding of the role of REM sleep, not sleep in general. The researchers also claim that improvements of memory overnight can be explained by the mere passage of time, rather than attributed to sleep. But recent studies of memory performance after sleep – including one demonstrating that sleep stabilizes declarative memories from future interference caused by mental activity during wakefulness – make this claim unsustainable. Certainly there are memory-consolidation processes that occur across periods of wakefulness, some of which neither depend on nor are enhanced by sleep. But when sleep is compared with wakefulness and performance is better after sleep, then some benefit of sleep for memory must be acknowledged. There are some memory-consolidation processes that have nothing to do with sleep., Sleep is more important to the consolidation of other types of memory., REM sleep is more important to memory consolidation than is non-REM sleep., There are significant variations in the amount of sleep that people require for the successful consolidation of memory., It is likely that memory is more thoroughly consolidated during wakefulness than during sleep.

1 Explanation


Chris Lele

Dec 2, 2012 • Comment

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