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Does age worsen sleep-dependent memory consolidation?

Melaine Cherdieu1, Emanuelle Reynaud, Josselin Uhlrich

  • 1Laboratoire d'Etude des Mécanismes cognitifs (EMC), Université Lumière Lyon 2, Lyon, France.

Journal of Sleep Research
|November 21, 2013
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Older adults show reduced memory benefits from sleep compared to younger adults. Sleep did not significantly improve memory consolidation in older individuals, unlike in younger ones.

Keywords:
REM sleepageingepisodic memoryslow wave sleep

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Cognitive Aging

Background:

  • Slow wave sleep (SWS) is crucial for episodic memory consolidation.
  • Aging is linked to decreased SWS and impaired episodic memory.
  • Understanding sleep's role in memory for older adults is essential.

Purpose of the Study:

  • To investigate if sleep benefits episodic memory consolidation in older adults.
  • To compare memory consolidation between young and older adults after sleep versus wakefulness.
  • To explore the relationship between sleep architecture and memory performance in aging.

Main Methods:

  • Visuospatial object-location memory task used in 20 young and 20 older adults.
  • Memory retention assessed after 12 hours of wakefulness or sleep.
  • Polysomnography measured sleep architecture in both groups.

Main Results:

  • The memory consolidation benefit of sleep was significantly reduced in older adults.
  • Young adults showed no forgetting after sleep, while older adults exhibited significant forgetting (16.60%).
  • Older adults had reduced sleep efficiency, total cycle time, and REM sleep, but SWS did not differ significantly.

Conclusions:

  • Sleep's positive impact on episodic memory consolidation is diminished in older adults.
  • Age-related changes in sleep architecture may negatively affect memory consolidation.
  • Further research is needed to understand interventions to improve sleep-dependent memory in aging.