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Language Without Speech: Segregating Distinct Circuits in the Human Brain.

Theresa Finkl1, Anja Hahne1, Angela D Friederici2

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|August 3, 2019
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Summary
This summary is machine-generated.

Language processing in the brain is independent of speech production. Deaf signers show similar core language tract connectivity to hearing individuals, but reduced speech pathway connectivity.

Keywords:
DTIdMRIdeaflanguage networkprobabilistic tractography

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Linguistics

Background:

  • The relationship between language and speech processing in the brain remains a significant research question.
  • Investigating deaf signers offers a unique model to dissociate neural pathways for language from those for speech.

Purpose of the Study:

  • To determine if core language tracts in the brain are independent of speech processing.
  • To compare the brain's structural connectivity in early deaf signers versus hearing controls.

Main Methods:

  • Probabilistic tractography was used to analyze brain structural connectivity.
  • Connectivity profiles of adult deaf signers (early sign language learners) were compared to matched hearing controls.

Main Results:

  • Core language tracts showed no significant differences in connectivity between deaf signers and hearing controls.
  • Deaf signers exhibited lower connectivity in speech production and perception pathways compared to controls.
  • Reduced interhemispheric connectivity was observed between auditory cortices in deaf individuals.

Conclusions:

  • The findings provide strong evidence that the neural pathways for language are functionally segregated from those for speech.
  • Language processing in the brain is independent of the modality of speech production.
  • Structural connectivity differences highlight the brain's adaptation to the absence of vocal speech.