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How context features modulate the involvement of the working memory system during discourse comprehension.

Xiaohong Yang1, Xiuping Zhang1, Yufang Yang1

  • 1CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing 100101, China; Department of Psychology, University of Chinese Academy of Sciences, Beijing 100049, China.

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Summary

This study shows how working memory (WM) brain regions respond to discourse context. Increased coherence demands activate the left inferior frontal gyrus, while longer contexts engage more WM areas.

Keywords:
CoherenceDiscourse comprehensionLengthTopic variationWorking memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Discourse comprehension relies on integrating information across sentences.
  • The working memory (WM) system plays a crucial role in processing extended linguistic input.
  • Understanding how specific context features modulate WM involvement is essential.

Purpose of the Study:

  • To investigate the neural basis of working memory involvement during discourse comprehension.
  • To examine how varying levels of coherence and context length affect brain activation within the WM system.
  • To identify specific brain regions within the WM system responsive to different discourse features.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Participants read two-sentence discourses with manipulated topic coherence and context length.
  • The working memory system was localized using a verbal N-back task.

Main Results:

  • Increased bridging coherence demands correlated with greater activation in the left inferior frontal gyrus.
  • Longer discourse context length led to increased activation in frontal and parietal regions of the WM system.
  • Topic variation between sentences did not significantly affect WM system activation.

Conclusions:

  • Contextual features, specifically coherence and length, differentially modulate working memory subcomponents during discourse processing.
  • The left inferior frontal gyrus is a key component of the WM system supporting discourse comprehension.
  • These findings offer insights into the neural mechanisms underlying language understanding and memory integration.