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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Computational Linguistics

Background:

  • Nouns in narratives convey significant information.
  • Previous fMRI studies show temporal cortex activation during noun processing.
  • The impact of noun density on brain functional connectivity in narratives remains unclear.

Purpose of the Study:

  • To investigate how changing noun density in narratives affects brain functional connectivity.
  • To determine if brain network coupling correlates with information load.
  • To identify specific brain regions involved in processing noun-heavy information.

Main Methods:

  • Acquired fMRI data from healthy individuals listening to a narrative with varying noun density.
  • Measured whole-network and node-specific degree and betweenness centrality.
  • Correlated network measures with information magnitude using a time-varying approach.

Main Results:

  • Noun density positively correlated with average regional connections and negatively with average betweenness centrality.
  • The bilateral anterior superior temporal sulcus (aSTS) showed increased connectivity positively associated with noun density.
  • aSTS connectivity changes were independent of verb density or syllable count.

Conclusions:

  • Brain global connectivity recalibrates based on the information load from nouns in natural language.
  • The anterior superior temporal sulcus (aSTS) plays a crucial role in processing noun-specific information within narratives.
  • Naturalistic stimulation and network metrics confirm the aSTS's function in noun processing.