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Narrative imagery: Emotional modulation in the default mode network.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The default mode network (DMN) is active during narrative construction and imagination.
  • Medial prefrontal cortex activity within the DMN is hypothesized to process emotional value in episodic memory.

Purpose of the Study:

  • To investigate the effects of pleasure and emotion on DMN activity during narrative imagery.
  • To differentiate between pleasure-specific and general emotion-related modulation within the DMN.

Main Methods:

  • A within-subject design was employed to identify the DMN at rest.
  • Participants then underwent functional brain activity assessment during pleasant, neutral, and unpleasant narrative imagery.

Main Results:

  • Replicated previous findings: enhanced medial prefrontal cortex activity during pleasant versus unpleasant imagery.
  • Observed emotion-related activation (pleasant/unpleasant vs. neutral) in other DMN nodes, including the PCC, angular gyrus, hippocampus, temporal cortex, temporal pole, dmPFC, and vlPFC.

Conclusions:

  • Emotional content significantly modulates activity across multiple DMN nodes.
  • Pervasive emotional influence on the DMN supports its role in retrieving and imagining motivationally relevant events for adaptive behavior planning.