Reduced Alpha power associated with the recall of mentation from Stage 2 and Stage REM sleep

  • Esposito M
  • Nielsen T
  • Paquette T
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Abstract

Relationships between Alpha (8-12 Hz) activity and cognitive processes during wakefulness raise the possibility of similar relationships between Alpha and cognitive activity during sleep. We hypothesized that Alpha power decreases during both Stage 2 and REM sleep would index the presence of sleep mentation in these stages. Absolute power for six classical EEG bands and three Alpha subbands was calculated for Stage 2 and REM sleep awakenings both with and without mentation recall. In both stages, recall was associated with lower Alpha power, especially with middle Alpha power (9.5-11.5 Hz). Unexpectedly, a similar effect for Delta power (0.5-4.0 Hz) was also observed. The Alpha effect may reflect cognitive elaboration active in the minutes preceding awakening; however, attention and memory processes cannot be excluded. The Delta effect is consistent with prior observations of regular linkages between Alpha and Delta power during sleep.

Author-supplied keywords

  • Alpha power
  • Delta power
  • Dreaming
  • Quantitative EEG
  • REM sleep
  • Sleep mentation
  • Stage 2 sleep

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