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Updated: May 29, 2026

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory
08:08

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory

Published on: June 18, 2014

Individual differences in working memory capacity predict sleep-dependent memory consolidation.

Kimberly M Fenn1, David Z Hambrick

  • 1Department of Psychology, Michigan State University, East Lansing, MI 48824, USA. kfenn@msu.edu

Journal of Experimental Psychology. General
|September 14, 2011
PubMed
Summary
This summary is machine-generated.

Working memory capacity (WMC) is linked to memory improvements after sleep, but not wakefulness. This suggests a core cognitive ability influences sleep-dependent memory consolidation.

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Area of Science:

  • Cognitive Neuroscience
  • Sleep Science
  • Memory Research

Background:

  • Online cognitive processes during conscious recall significantly impact memory differences.
  • Offline processes during sleep also play a crucial role in memory consolidation.
  • The relationship between individual differences in online and offline memory processes is not well understood.

Purpose of the Study:

  • To investigate the relationship between working memory capacity (WMC) and sleep-dependent declarative memory consolidation.
  • To determine if WMC, a key factor in online processing, influences memory enhancement after sleep.

Main Methods:

  • Participants' declarative memory for word pairs was tested.
  • Memory performance was assessed after a period of sleep and an equal interval of wakefulness.
  • Correlation analysis was used to examine the relationship between WMC and memory changes.

Main Results:

  • Memory for word pairs significantly improved after sleep, but not after wakefulness.
  • A positive correlation was found between WMC and the increase in memory performance following sleep.
  • No significant correlation was observed between WMC and memory changes after wakefulness.

Conclusions:

  • Working memory capacity is positively associated with sleep-dependent memory consolidation.
  • This finding suggests an underlying cognitive ability that differentiates individuals with high memory capacity.
  • The results highlight the specific role of sleep in memory enhancement related to WMC.