Delta waves are seen in
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- Deep sleep
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- REM sleep
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- Awake state
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- Stage I NREM sleep
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Stages of sleep and rhythm
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Beta rhythm- Alert, awake, maximum concentration.
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Alpha rhythm- Eyes closed, mind wandering, less attentiveness
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Theta rhythm- Stage 1 NREM
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Sleep spindles, K complex- Stage 2 NREM
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Delta rhythm- Deep sleep (Stage 3 & 4 NREM)
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Beta Rhythm and occasional reappearance of alpha rhythm- REM