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Grammatical Impairments in PPA.

Cynthia K Thompson1, Jennifer E Mack2

  • 1Department of Communication Sciences and Disorders, Northwestern University Francis Searle Building, 2240 Campus Drive, Evanston, IL 60208 ; Cognitive Neurology and Alzheimer's Disease Center, Northwestern University Feinberg School of Medicine, 320 E. Superior, Searle 11-453, Chicago, IL 60611 ; Department of Neurology, Northwestern University Feinberg School of Medicine, Abbott Hall, 11 Floor, 710 North Lake Shore Drive, Chicago, IL 60611.

Aphasiology
|February 3, 2015
PubMed
Summary
This summary is machine-generated.

Primary progressive aphasia, agrammatic subtype (PPA-G) involves distinct grammatical impairments affecting both language production and comprehension. Research identifies neural correlates and assessment tools for PPA-G, guiding future treatment strategies.

Keywords:
morphologyprimary progressive aphasiasentence comprehensionsentence productionsyntax

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Area of Science:

  • Neurolinguistics
  • Cognitive Neuroscience
  • Clinical Neurology

Background:

  • Grammatical impairments are a hallmark of the agrammatic subtype of primary progressive aphasia (PPA-G).
  • Grammatical processing is relatively preserved in logopenic (PPA-L) and semantic (PPA-S) subtypes of PPA.
  • Understanding these distinctions is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To review research on grammatical deficits in PPA and their neural underpinnings.
  • To discuss the production and comprehension of key morphosyntactic structures.
  • To address assessment methods and treatment strategies for progressive grammatical impairments.

Main Methods:

  • Review of existing research on grammatical deficits in PPA subtypes.
  • Focus on production and comprehension of grammatical morphology, functional categories, verbs, and complex syntax.
  • Emphasis on behavioral tests for assessing grammatical processing and emerging assessment tools.

Main Results:

  • PPA-G exhibits grammatical deficits across production and comprehension, linked to left inferior frontal gyrus (IFG) and dorsal white matter tract damage.
  • These neural regions are associated with impaired processing of complex sentences.
  • New assessment tools are highlighted for detailed examination of morphosyntactic processing in PPA.

Conclusions:

  • PPA-G presents unique agrammatic patterns, distinct from PPA-L and PPA-S, and similar to stroke-induced agrammatism.
  • Identified patterns of atrophy and white matter changes in PPA-G.
  • Recommended clinical evaluation methods and emerging tools for agrammatism are discussed; further research on treatment and neural mechanisms is needed.