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Behav Brain Sci. 2013 Dec;36(6):613-4; discussion 634-59. doi: 10.1017/S0140525X1300126X.

Don't count your chickens before they're hatched: elaborative encoding in REM dreaming in face of the physiology of sleep stages.

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Neuropsychology and Functional Neuroimaging Research Unit (UR2NF) affiliated with the Center for Research in Cognition and Neurosciences (CRCN) and ULB Neurosciences Institute (UNI), Université Libre de Bruxelles (ULB), B-1050 Brussels, Belgium.


Llewellyn suggests that episodic memories undergo "elaborative encoding" during rapid eye movement (REM) dreams, generating novel associations between recent and remote memories that are then instantiated during non-REM (NREM) sleep. This hypothesis conflicts with our knowledge of the physiology of NREM and then REM sleep stages and their ordered succession. Moreover, associations during sleep might also involve the extraction of hidden patterns rather than de novo associations.

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