Sleep is known to be important for creative thinking, but exactly how it helps and what role each sleep stage -- REM and non-REM -- plays remains unclear. A team of researchers have now developed a theory, outlined in an Opinion published May 15 in the journal Trends in Cognitive Sciences , to explain how the interleaving of REM and non-REM sleep might facilitate creative problem solving in different but complementary ways. Studies show that this kind of restructuring often happens while we are asleep, so Lewis and her co-authors drew on that literature, as well as physiological and behavioral data, to create a model of what might be happening during each stage. Their model proposes that non-REM sleep helps us organize information into useful categories, whereas REM helps us see beyond those categories to discover unexpected connections. According to previous research, memories captured by the hippocampus are replayed during non-REM sleep, and as we detect similarities between them, that information gets stored in the cortex. Because the hippocampus and cortex are in close communication during this stage, Lewis and her co-authors propose that the hippocampus somehow controls what is replayed. Because it prefers to replay things that are similar or thematically linked, it encourages us to find those links and use them to form schemas, or organizing frameworks. During REM sleep, on the other hand, the hippocampus and cortex don't appear to be nearly as in sync. So, Lewis's team suspects that the cortex is now free to replay stored memories in any combination, regardless of whether they are similar. Meanwhile, evidence suggests that ponto-geniculo-occipital waves cause areas of the cortex to randomly activate, which could trigger the replay of memories from different schemas.
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