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Cited by 48Sleep and Wakefulness ResearchMemory and Neural MechanismsMemory Processes and Influences

Delayed Onset of a Daytime Nap Facilitates Retention of Declarative Memory

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Alger, Sara E., Lau, Hiuyan, Fishbein, William·2010·PLoS ONE
DOI 10.1371/journal.pone.0012131PMC PMC2924607
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Abstract

BACKGROUND: Learning followed by a period of sleep, even as little as a nap, promotes memory consolidation. It is now generally recognized that sleep facilitates the stabilization of information acquired prior to sleep. However, the temporal nature of the effect of sleep on retention of declarative memory is yet to be understood. We examined the impact of a delayed nap onset on the recognition of neutral pictorial stimuli with an added spatial component. METHODOLOGY/PRINCIPAL FINDINGS: Participants completed an initial study session involving 150 neutral pictures of people, places, and objects. Immediately following the picture presentation, participants were asked to make recognition judgments on a subset of "old", previously seen, pictures versus intermixed "new" pictures. Participants were then divided into one of four groups who either took a 90-minute nap immediately, 2 hours, or 4 hours after learning, or remained awake for the duration of the experiment. 6 hours after initial learning, participants were again tested on the remaining "old" pictures, with "new" pictures intermixed. CONCLUSIONS/SIGNIFICANCE: Interestingly, we found a stabilizing benefit of sleep on the memory trace reflected as a significant negative correlation between the average time elapsed before napping and decline in performance from test to retest (p = .001). We found a significant interaction between the groups and their performance from test to retest (p = .010), with the 4-hour delay group performing significantly better than both those who slept immediately and those who remained awake (p = .044, p = .010, respectively). Analysis of sleep data revealed a significant positive correlation between amount of slow wave sleep (SWS) achieved and length of the delay before sleep onset (p = .048). The findings add to the understanding of memory processing in humans, suggesting that factors such as waking processing and homeostatic increases in need for sleep over time modulate the importance of sleep to consolidation of neutral declarative memories.

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  • Sleep after learning benefits declarative memory.

    “In fact, at a purely behavioral level, numerous studies have demonstrated that sleep after learning benefits declarative (17,18,60,63,79,290,326,327,343,348,350,376,408,427,431,478,479,547,560,571,574,592,603,682,732,735,861,898,930,932,959,1069,1172,1192,1217,1274,1276,1278,1282,1302) as well as nondeclarative kinds of procedural memory (135,147,164,311,322,374,383,435,447,563,602,631,664,679,733”

    From About Sleep's Role in Memory (2013) · cites this paper as [17]

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Authors
Alger, S. E., Lau, H., & Fishbein, W.
Affiliations
City College of New York (US)
Corresponding author
Alger, Sara E.
ORCID
Alger, Sara E.
Venue
PLoS ONE
Publisher
Public Library of Science (PLoS)
Published
2010-08-12
Volume
5
Issue
8
Pages
e12131
ISSN
1932-6203 (ISSN-L)
DOI
10.1371/journal.pone.0012131
PMC
PMC2924607
OpenAlex
W2166803750
Cited by
48
References
11
Citations by year
2026: 1 · 2025: 1 · 2024: 3 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 5 · 2019: 2 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 1 · 2014: 5 · 2013: 2 · 2012: 3
FWCI
1.75
Type
journal article
Language
en
Open access
Licence
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • CUNY Academic Works (City University of New York) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • City University of New York
  • Research Foundation of The City University of New York
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
daytime napping, sleep timing, memory consolidation, declarative memory, recognition memory, slow-wave sleep, sleep homeostasis
MeSH terms
Adolescent, Adult, Analysis of Variance, Female, Humans, Male, Pattern Recognition, Visual, Retention, Psychology, Sleep, Sleep, REM, Time Factors, Wakefulness, Young Adult

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