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Updated: Mar 30, 2026

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
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Phonological Processing in Primary Progressive Aphasia.

Maya L Henry1,2, Stephen M Wilson2,3, Miranda C Babiak2

  • 1University of Texas at Austin.

Journal of Cognitive Neuroscience
|November 7, 2015
PubMed
Summary
This summary is machine-generated.

Primary progressive aphasia (PPA) subtypes show distinct phonological processing deficits. Impaired phonological skills in nonfluent/agrammatic and logopenic PPA variants are linked to dorsal pathway damage.

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Area of Science:

  • Neuroscience
  • Linguistics
  • Neurology

Background:

  • Primary progressive aphasia (PPA) involves selective language network breakdown.
  • Phonological short-term memory (STM) impairment is linked to the logopenic PPA variant and dorsal pathway damage.
  • Phonological abilities in semantic and nonfluent/agrammatic PPA variants are less understood.

Purpose of the Study:

  • To comprehensively assess phonological processing in PPA subtypes.
  • To determine if performance patterns support the dorsal-ventral pathway framework.
  • To explore neural correlates of phonological deficits using voxel-based morphometry.

Main Methods:

  • Phonological processing skills were evaluated in PPA participants and healthy controls.
  • Voxel-based morphometry (VBM) was used to analyze brain structure.
  • Binary logistic regression identified predictors of diagnostic group membership.

Main Results:

  • Phonological performance was impaired in nonfluent/agrammatic and logopenic PPA variants, particularly on nonword tasks in the logopenic group.
  • Phonological tasks, combined with motor speech measures, accurately predicted less fluent PPA variants.
  • Gray matter integrity in left hemisphere frontal and temporoparietal regions correlated with phonological skill.

Conclusions:

  • Findings support the critical role of dorsal stream structures in phonological processing.
  • Unique patterns of phonological impairment are identified in logopenic and nonfluent/agrammatic PPA variants.
  • Dorsal pathway integrity is essential for phonological abilities in PPA.