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NREM |
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Exposure at this frequency may be more likely to induce an acute response because the beta frequency band exhibits a close temporal association with epochs of REM sleep and also shows a reciprocal relationship with delta activity during NREM sleep (31). Another approach to differentiating REM from NREM sleep is a computer analysis of EOG rapid eye movements, although the occurrence of frequent rapid eye movements can be mistaken for wakefulness. In NREM sleep there are four stages characterized by different combinations of brain waves, eye movements, and reduced muscle tension. |
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