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Related Experiment Video

Updated: May 19, 2026

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
05:38

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Published on: June 29, 2021

Functional Heterogeneity within the Default Network during Semantic Processing and Speech Production.

Mohamed L Seghier1, Cathy J Price

  • 1Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London London, UK.

Frontiers in Psychology
|August 21, 2012
PubMed
Summary
This summary is machine-generated.

The default mode network (DMN) shows varied activity during language tasks. Specific DMN regions deactivate differently based on task type, revealing functional heterogeneity beyond task difficulty.

Keywords:
default networkfunctional MRIlanguagesemantic decisionsspeech productionwords and objects

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • The default mode network (DMN) is typically associated with internally-directed thought.
  • Its role during externally-focused cognitive tasks, like language processing, is complex and debated.
  • Understanding DMN functional heterogeneity is key to mapping brain function.

Purpose of the Study:

  • To investigate the functional heterogeneity of core default mode network (DMN) nodes during language processing.
  • To examine how different language tasks and stimuli modulate DMN activity.
  • To differentiate DMN responses based on task demands and stimulus type.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 94 healthy subjects.
  • A factorial design manipulated language tasks (semantic matching, speech production) and stimuli (familiar/unfamiliar words/objects).
  • Task-induced deactivations within DMN core nodes were analyzed.

Main Results:

  • The left inferior parietal lobule showed less deactivation during semantic matching compared to perceptual matching.
  • Anterior posterior cingulate cortex (PCC) and ventromedial prefrontal cortex (MPFC) showed greater deactivation during semantic matching.
  • Specific DMN nodes exhibited differential deactivation patterns based on task type (speech production vs. semantic matching) and stimulus modality (words vs. objects).

Conclusions:

  • Core DMN nodes are functionally heterogeneous and not uniformly deactivated during cognitive tasks.
  • Task difficulty alone does not fully explain variations in DMN task-induced deactivations.
  • The DMN's core nodes show differential sensitivity to specific language processing demands.