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Integrating Region- and Network-level Contributions to Episodic Recollection Using Multilevel Structural Equation

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The posterior medial (PM) network has ventral and dorsal subnetworks. The ventral subnetwork uniquely contributes to recollection, particularly spatial memory, revealing network-level effects on brain region activity.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Networks

Background:

  • The brain relies on interacting networks for higher-order cognition.
  • A core network, the posterior medial (PM) network, is linked to episodic memory and recollection.
  • Previous studies focused on individual regions or network integration, leaving region-network relationships unclear.

Purpose of the Study:

  • To investigate the functional organization of the posterior medial (PM) network.
  • To examine how regional and network-level contributions relate to episodic memory.
  • To understand functional heterogeneity within the PM network.

Main Methods:

  • Multilevel structural equation modeling was employed.
  • Functional organization was analyzed by examining subnetworks within the PM network.
  • Regionally specific contributions were assessed while controlling for network effects.

Main Results:

  • The PM network comprises distinct ventral and dorsal subnetworks.
  • The ventral subnetwork showed a unique role in recollection, especially for spatial information.
  • Network-level effects adequately explained memory-related activity in individual brain regions.

Conclusions:

  • The PM network exhibits functional heterogeneity with distinct subnetworks.
  • Understanding regional functions requires considering their network context.
  • This study clarifies the interplay between regional and network contributions to episodic memory.