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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
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Overview of Synapses01:25

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Higher Mental Functions of Brain: Learning and Memory

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Related Experiment Video

Updated: May 10, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

Concurrent synaptic and systems memory consolidation during sleep.

Laura Mascetti1, Ariane Foret, Jessica Schrouff

  • 1Cyclotron Research Centre, University of Liège, 4000 Liège, Belgium.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 14, 2013
PubMed
Summary
This summary is machine-generated.

Sleep consolidates memories through both strengthening neural connections and reducing synaptic efficiency. Genetic variations in BDNF influence how episodic memories are processed during sleep, impacting both systems-level consolidation and synaptic downscaling.

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Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory
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Last Updated: May 10, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

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

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sleep Research

Background:

  • Memory consolidation during sleep involves two key processes: strengthening memory traces and reducing overall synaptic strength.
  • The interplay between these processes and their genetic underpinnings remains incompletely understood.

Purpose of the Study:

  • To investigate whether episodic memories are processed during sleep via systems-level consolidation, synaptic downscaling, or both.
  • To examine the influence of Brain-Derived Neurotrophic Factor (BDNF) Val66Met polymorphism on these sleep-dependent memory consolidation mechanisms.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to compare brain activity during episodic memory recollection before and after sleep.
  • Participants were genotyped for the BDNF rs6265 (Val66Met) polymorphism, dividing them into Val/Val and Met carrier groups.
  • Slow oscillation power during sleep was measured and correlated with changes in brain activity.

Main Results:

  • Val/Val individuals showed greater increases in recollection-related activity in novel parietal and occipital areas post-sleep, indicating enhanced systems-level consolidation.
  • Both groups exhibited increased activity in previously engaged regions, but this increase was proportional to slow oscillation power, suggesting synaptic downscaling.
  • Differential responses between allelic groups highlight the role of BDNF genotype in modulating these consolidation processes.

Conclusions:

  • Episodic memory consolidation during sleep occurs through both systems-level strengthening and synaptic downscaling.
  • The BDNF Val66Met polymorphism significantly influences the balance of these two processes, affecting memory processing.
  • These findings suggest that sleep-dependent memory consolidation involves complex interactions at both synaptic and systems levels, modulated by genetic factors.