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In page Charcot–Wilbrand syndrome:

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There is new focus on the type of injury and analysis of REM sleep pertaining to CWS. A more current medical definition lists CWS as "the association of loss of the ability to conjure up visual images or memories and the loss of dreaming".[1] A 2004 case-evaluation of a 74-year-old woman who had experienced an acute, bilateral occipital artery infarction which rendered her dreamless for a 3-month period was to perform polysomnography testing in combination with patient dream reporting to determine both her sleep architecture or pattern of sleep stages, and subsequent dream recollection.[2] Such techniques allow for associations between the physiological timetable of dreaming during REM sleep and the patient's ability to recall dreams to be compared closely.[citation needed]