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Echoes of the brain within the posterior cingulate cortex.

Robert Leech1, Rodrigo Braga, David J Sharp

  • 1Computational, Cognitive and Clinical Neuroscience Laboratory, Division of Experimental Medicine, Department of Medicine, Hammersmith Hospital Campus, Imperial College London, London W12 0NN, United Kingdom. r.leech@imperial.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
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The posterior cingulate cortex (PCC) acts as a brain hub, integrating information from different networks. Its subregions dynamically manage internal thought and external cognitive control, aiding flexible behavior adaptation.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • The posterior cingulate cortex (PCC) is a key node in the default mode network (DMN), known for high metabolic activity and connectivity, suggesting a role as a cortical hub.
  • While traditionally linked to internally directed thought (e.g., memory recollection), recent research suggests the PCC may also actively control cognition by signaling environmental changes and behavioral needs.

Purpose of the Study:

  • To investigate the functional architecture of the PCC and its role in integrating information from distinct brain networks.
  • To determine if PCC activity patterns reflect complex integration of other brain networks, supporting flexible behavioral adaptation.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) in humans.
  • Employed multivariate analysis to examine PCC activity patterns and functional connectivity with other brain networks.

Main Results:

  • Demonstrated that the PCC exhibits a complex functional architecture with separable, overlapping subregions.
  • Identified a ventral PCC region strongly connected to the DMN, while dorsal PCC subregions showed high connectivity with frontoparietal cognitive control networks.
  • Observed distinct activity modulation in PCC subregions during an attentionally demanding task, indicating interaction with frontoparietal networks.

Conclusions:

  • The PCC's complex functional architecture supports its role as an integration hub for diverse brain networks.
  • Specific subregions of the PCC, particularly the dorsal part, interact with cognitive control networks to regulate the balance between internally and externally directed cognition.
  • These findings suggest the PCC is crucial for flexibly adapting behavior in response to environmental changes.