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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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Neural Network Connectivity During Post-encoding Rest: Linking Episodic Memory Encoding and Retrieval.

Okka J Risius1,2, Oezguer A Onur1,2, Julian Dronse1,2

  • 1Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany.

Frontiers in Human Neuroscience
|January 29, 2019
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Summary
This summary is machine-generated.

Post-encoding rest strengthens memory networks by forming new functional connections. Cognitive interference disrupts these connections, impairing memory recall.

Keywords:
episodic memory consolidationfunctional connectivitymemory interferencememory traceresting state fMRI

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Memory encoding and retrieval involve distinct brain networks.
  • A switch between these networks is commonly observed.
  • Post-encoding rest may facilitate memory consolidation by altering neural connectivity.

Purpose of the Study:

  • To investigate functional connectivity (FC) changes during post-encoding rest using resting-state fMRI.
  • To determine if new functional connections form between encoding and retrieval networks during rest.
  • To examine the impact of interfering and reminding tasks on these FC changes and memory performance.

Main Methods:

  • Resting-state functional magnetic resonance imaging (fMRI) was employed.
  • Functional connectivity (FC) was measured during post-encoding rest.
  • Interfering and reminding tasks were used to modulate cognitive processes.

Main Results:

  • Increased FC was observed between encoding-related regions (right inferior occipital and fusiform gyri) and retrieval-related regions (left inferior frontal gyrus, left middle temporal gyrus - MTG).
  • The left MTG was identified as a region mediating successful retrieval.
  • Cognitive interference disrupted FC changes and reduced memory performance, while reminders inhibited FC increases without affecting memory.

Conclusions:

  • Post-encoding rest promotes the formation of functional connections between memory encoding and retrieval networks.
  • These newly formed connections are dynamic and sensitive to cognitive interference.
  • Understanding these connectivity changes offers insights into memory consolidation mechanisms.