PreprintCited by 536Sleep and Wakefulness ResearchMemory and Neural MechanismsMemory Processes and Influences

Declarative memory consolidation: mechanisms acting during human sleep

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Gais, Steffen, Born, Jan·2004·Learning & Memory

Abstract

Of late, an increasing number of studies have shown a strong relationship between sleep and memory. Here we summarize a series of our own studies in humans supporting a beneficial influence of slow-wave sleep (SWS) on declarative memory formation, and try to identify some mechanisms that might underlie this influence. Specifically, these experiments show that declarative memory benefits mainly from sleep periods dominated by SWS, whereas there is no consistent benefit of this memory from periods rich in rapid eye movement (REM) sleep. A main mechanism of declarative memory formation is believed to be the reactivation of newly acquired memory representations in hippocampal networks that stimulates a transfer and integration of these representations into neocortical neuronal networks. Consistent with this model, spindle activity and slow oscillation-related EEG coherence increase during early sleep after intense declarative learning in humans, signs that together point toward a neocortical reprocessing of the learned material. In addition, sleep seems to provide an optimal milieu for declarative memory reprocessing and consolidation by reducing cholinergic activation and the cortisol feedback to the hippocampus during SWS.

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  • Studies using the night-half paradigm have provided substantial evidence for the dual processes hypothesis: hippocampus-dependent declarative memories preferentially profit from SWS, whereas nondeclarative aspects of memory (procedural, implicit, emotional) additionally profit from REM sleep.

    “Overall, studies using the night-half paradigm have provided substantial evidence for the dual processes hypothesis, such as hippocampus-dependent declarative memories preferentially profiting from SWS, whereas nondeclarative aspects of memory, such as procedural, implicit, and emotional, additionally profiting from REM sleep (121, 428).”

    From About Sleep's Role in Memory (2013) · cites this paper as [428]

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  • Sleep is thought to be a neural state during which consolidation of declarative memories takes place.

    “Sleep is thought to be a neural state during which consolidation of declarative memories takes place.83”

    From Sleep Deprivation and Circadian Disruption (2015) · cites this paper as [83]

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Authors
Gais, S., & Born, J.
Affiliations
University of Lübeck (DE)
Venue
Learning & Memory
Published
2004-11
Volume
11
Issue
6
Pages
679-685
ISSN
  • 1072-0502 (ISSN-L)
  • 1549-5485
OpenAlex
W2116888545
Cited by
536
References
84
Citations by year
2026: 23 · 2025: 18 · 2024: 24 · 2023: 11 · 2022: 19 · 2021: 23 · 2020: 23 · 2019: 34 · 2018: 19 · 2017: 27 · 2016: 29 · 2015: 20 · 2014: 27 · 2013: 33 · 2012: 22
Type
posted content
Language
en
Open access
Locations
  • Learning & Memory (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
Keywords
declarative memory consolidation, sleep, slow-wave sleep, REM sleep, memory reactivation, hippocampus, sleep spindles, slow oscillations, EEG coherence, cholinergic stimulation, cortisol, memory reprocessing
MeSH terms
Acetylcholine, Electrophysiology, Hippocampus, Humans, Hypothalamo-Hypophyseal System, Learning, Pituitary-Adrenal System, Mental Recall, Sleep Deprivation, Sleep Stages, Thinking, Polysomnography, Recognition, Psychology

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