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Active processing of declarative knowledge during REM-sleep dreaming.

C Cipolli1, R Bolzani, G Tuozzi

  • 1Department of Psychology, University of Bologna, Bologna, Italy. cipolli@psibo.unibo.it

Journal of Sleep Research
|March 21, 2002
PubMed
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During sleep, cognitive concerns from waking life can influence which recently learned information is accessed and processed in dreams. This suggests that concerns may aid in knowledge consolidation by promoting dream content incorporation.

Area of Science:

  • Cognitive Neuroscience
  • Sleep Science

Background:

  • Sleep plays a role in processing recently acquired knowledge.
  • The extent of sleeper control over this processing, particularly non-volitional and non-conscious aspects, remains an area of investigation.

Purpose of the Study:

  • To investigate whether and how cognitive concerns from prior waking influence the processing of recently acquired declarative knowledge during sleep.
  • To determine if these concerns affect the accessibility and incorporation of learned information into dream content.

Main Methods:

  • A delayed recall task involving 12 subjects who heard nonsense sentences before three sleep onsets.
  • Awakenings during rapid eye movement (REM) sleep to collect dream reports and recall the last heard sentence.
  • Comparison of sentence incorporation frequency during REM sleep with control conditions.

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Main Results:

  • Sentences heard before sleep onsets were more frequently incorporated into dream content compared to control sentences.
  • The frequency of incorporation was higher for sentences associated with cognitive concerns.
  • The manner or modalities of dream content elaboration did not differ based on sentence incorporation.

Conclusions:

  • Cognitive concerns during waking can direct the access and processing of recently learned declarative knowledge during sleep.
  • While concerns influence what information is processed, they do not alter how it is elaborated within dreams.
  • This processing during sleep, guided by cognitive concern, may contribute to the consolidation of knowledge.