Non Rem Sleep Enhances Memory Consolidation

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Non-REM Sleep Enhances Declarative Memory Consolidation in a Dose-Response Manner in Diurnal Sleep Episodes Rachel Cox PSYC*4470 11/22/14 0763535 Abstract Both nocturnal and diurnal sleep enhances memory consolidation. Rapid eye movement (REM) sleep enhances procedural memory traces, whereas non-REM (NREM) sleep, particularly slow wave sleep (SWS), enhances declarative memory aspects. It is speculated whether an increase in time spent in the NREM stage would provide additional memory benefits. The goal of this research design is to establish whether declarative memory is dose-dependent on the length of the NREM episode achieved during sleep. First, a visuospatial object recognition task and a procedural finger sequence…show more content…
These stages are characterized by bursts of electrical activity on electroencephalogram (EEG) recordings. EEG readings monitor electrical activity representing neuronal activity in specific neurophysiological regions. Rapid eye movement (REM) sleep is characterized by desynchronized, saw-toothed theta rhythm waves and heightened cognitive activity. Comparatively, high amplitude, synchronous delta waves, and sharp hippocampal waves characterize slow wave sleep (SWS) sleep (stages 3-4 of non-REM sleep) (Tucker et al. 2006). A greater understanding of these complex and dynamic brain states has helped clarify the ways in which sleep enhances memory processing. An increasing number of sleep studies have behaviourally assessed the facilitative role of REM and NREM sleep on declarative and procedural memory performance in humans. The preliminary results provided initial evidence to the idea that hippocampal-dependent declarative memories, such as memories of personal events and fact-based information, are facilitated by NREM sleep (specifically SWS) and hippocampal-independent procedural memories are facilitated by REM sleep (Plihal & Born, 1997). Researchers tested this idea by monitoring several individuals’ performance declines on memory tasks following selective sleep deprivation or administration of drugs that hinder the NREM-REM cycle. Performance on procedural memory
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