Smith and Hanke, 15 for example, report evidence of sleep mentation related to a pre-sleep learning task, present to a greater degree in participants cued during sleep using a task-associated sound. Though little empirical work has thus far addressed this question, some preliminary evidence is at least suggestive of a link between sleep mentation and recent learning. We propose that reports of subjective experience may provide a valuable methodology for exploring the characteristics of memory traces recruited for reactivation during sleep. 12, 13 Similarly, only intermittent fragments of recent episodic memories appear in sleep mentation, intermingled with remote and semantic material. Neuronal firing sequences established during wake are re-expressed only intermittently during rodent NREM sleep, with relatively low fidelity and on a faster time scale than the original experience. Recent experience is not replayed veridically during sleep.
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