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Establishing task- and modality-dependent dissociations between the semantic and default mode networks.

Gina F Humphreys1, Paul Hoffman2, Maya Visser3

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Summary

The default mode network (DMN) and semantic network (SN) show distinct patterns in the brain. The anterior temporal lobe (ATL) is key for semantic tasks, while the angular gyrus (AG) is not.

Keywords:
angular gyrusanterior temporal lobedefault mode networkdistortion-corrected fMRIsemantic network

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The default mode network (DMN) and semantic network (SN) are critical brain systems.
  • These networks are increasingly used as clinical biomarkers in neurological studies.
  • Anatomical overlap suggests a relationship between DMN and SN, particularly in the anterior temporal lobe (ATL) and angular gyrus (AG).

Purpose of the Study:

  • To directly compare the functional MRI (fMRI) activity of the SN and DMN.
  • To investigate the relationship between these networks across various semantic and nonsemantic tasks.
  • To clarify the distinct roles of ATL and AG in semantic processing.

Main Methods:

  • Utilized a large (n=69) distortion-corrected fMRI dataset.
  • Employed a range of semantic and nonsemantic tasks with varying input modalities.
  • Analyzed brain activity patterns within the DMN and SN.

Main Results:

  • Both DMN and SN activity fractionated based on task semantics, stimulus type, modality, and difficulty.
  • The left ATL showed positive activation for all semantic tasks and deactivation during nonsemantic tasks.
  • The left AG was deactivated across all tasks, with deactivation intensity correlating with task difficulty, challenging its role as a semantic hub.

Conclusions:

  • The ATL, not the AG, plays a significant role in semantic representation.
  • ATL and AG exhibit differential engagement patterns, with shared deactivation during nonsemantic tasks.
  • Findings have implications for understanding DMN variability, cognitive coherence, and resting-state fMRI interpretation.