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Sleep & cognition

Does poor sleep make older adults forget faster over a week?

Mary A, Schreiner S, Peigneux P · Frontiers in psychology · 2013

Open access · cc by · source: Europe PMC

Healthy older adults forget newly learned word associations much faster over a seven-day period than younger adults, and this forgetting is linked to waking up frequently during the night.

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How this study connects

Role on claims

Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.

  • SupportsEpisodic Memoryconcept

    Sleep helps consolidate newly learned episodic information, reducing the forgetting rate of both associative items and their contextual sources.

    Evidence for the claim as stated.

  • SupportsMemory Consolidationconcept

    When you test decides what you find; a normal immediate score does not mean normal retention.

    A consolidation deficit can be invisible at short delays and obvious at long ones. Older adults matched younger adults on word-pair recall immediately and after 30 minutes, then showed significantly higher forgetting and lower recall at seven days.

    Evidence for the claim as stated.

  • SupportsSleep Architectureconcept

    Fragmentation accompanied accelerated forgetting even where short-delay memory looked normal.

    Continuity matters independently of duration. Older adults who forgot word pairs far faster by seven days also reported waking more often and for longer during the night than younger adults, despite matched immediate and 30-minute recall.

    Evidence for the claim as stated.

Discoveries this paper informs or conflicts with

Study at a glance

Design
Case-control — Word-pair learning with delayed recall and sleep-awakening measures in young vs older adults
N
N=32 · 16 young (18–30) and 16 older (65–75) healthy French-speaking adults
Population
Healthy young and older adults not taking sleep- or memory-affecting medication
Outcome
Long-term word-pair retention and its relation to intra-sleep awakenings

Structured fields used in claim comparison tables when every cited study has a complete layer.

Inspect source passages

Does poor sleep make older adults forget faster over a week?

These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.

16 young participants

Long-term declarative memory consolidation processes were investigated using a variant of the word pairs learning task in 16 young (range 18–30 years, M = 21.02, SD = 1.92; 2 men) and 16 older (range 65–75 years, M = 69.67, SD = 2.52; six men) healthy French-speaking adults.

28 word pairs

Participants learned a list of 28 semantically unrelated French word pairs, composed of concrete, high frequency (; ), and emotionally neutral bisyllabic nouns (; ).
Read passages in the original paper

Key findings

While both groups recalled similar amounts of word pairs immediately and 30 minutes after learning, the older adults showed a significantly higher forgetting rate and lower recall performance when tested 7 days later. Furthermore, older adults reported waking up more frequently and for longer periods during the night compared to younger adults. Within the older group, waking up more often during the night was associated with worse memory recall at the 7-day mark.

Methodology

The researchers compared 16 healthy young adults and 16 healthy older adults on their ability to remember 28 unrelated word pairs paired with visual sketches. Memory performance was tested immediately, 30 minutes later, and 7 days after the initial learning phase. Throughout the intervening week, participants kept daily sleep diaries to track their sleep duration, quality, and the number of times they woke up during the night.

Limitations

First, because sleep quality was assessed using self-reported daily diaries rather than objective brain-monitoring equipment, these subjective sleep measures may not perfectly capture actual sleep architecture. Second, the study's correlational nature means we cannot definitively prove that waking up during the night causes accelerated forgetting, only that the two are linked. Lastly, the sample size of 16 participants per group is relatively small, meaning the findings may not represent all older populations.

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