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Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

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Updated: May 28, 2026

Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping
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Syntactic processing depends on dorsal language tracts.

Stephen M Wilson1, Sebastiano Galantucci, Maria Carmela Tartaglia

  • 1Department of Speech, Language and Hearing Sciences, University of Arizona, 1131 E. 2nd Street, Tucson, AZ 85721, USA. smwilson@u.arizona.edu

Neuron
|October 25, 2011
PubMed
Summary
This summary is machine-generated.

Syntactic processing relies on dorsal language tracts, not ventral ones. Damage to the superior longitudinal fasciculus, including its arcuate component, causes syntax deficits in primary progressive aphasia.

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Area of Science:

  • Neuroscience
  • Linguistics
  • Neuroimaging

Background:

  • Frontal and temporal language regions are connected by dorsal and ventral white matter tracts.
  • The specific roles of these tracts in syntactic processing remain unclear.

Purpose of the Study:

  • To determine which white matter tracts are crucial for syntactic processing.
  • To investigate the relationship between white matter damage and syntactic deficits in primary progressive aphasia (PPA).

Main Methods:

  • Multimodal neuroimaging (Diffusion Tensor Imaging, fMRI) and neurolinguistic assessment.
  • Examined white matter microstructural integrity and gray matter atrophy in PPA patients.
  • Correlated white matter damage with syntactic comprehension and production deficits.

Main Results:

  • Microstructural damage to left hemisphere dorsal tracts, specifically the superior longitudinal fasciculus (SLF) and its arcuate fasciculus component, strongly correlated with syntactic deficits.
  • Damage to these dorsal tracts predicted syntactic impairments even after accounting for gray matter atrophy.
  • Functional MRI confirmed that the SLF connects language regions involved in syntactic processing.
  • Damage to ventral tracts (extreme capsule fiber system, uncinate fasciculus) was not associated with syntactic deficits.

Conclusions:

  • Syntactic processing predominantly relies on dorsal language tracts, particularly the superior longitudinal fasciculus.
  • Ventral tracts are not primarily involved in syntactic processing.
  • These findings clarify the white matter pathways essential for syntax in the human brain.