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Sentence processing in frontotemporal dementia.

Murray Grossman1, Jina Rhee, Peachie Moore

  • 1Department of Neurology, University of Pennsylvania, Philadelphia 19104-4283, USA. mgrossma@mail.med.upenn.edu

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 16, 2005
PubMed
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Frontotemporal dementia (FTD) patients show sentence comprehension deficits due to grammatical and executive resource impairments. Different FTD subtypes exhibit distinct comprehension difficulties impacting language processing.

Area of Science:

  • Neuroscience
  • Linguistics
  • Cognitive Psychology

Background:

  • Frontotemporal dementia (FTD) is characterized by progressive neurodegeneration, often leading to significant language and behavioral impairments.
  • Sentence comprehension difficulties are a common symptom in FTD, but the underlying cognitive mechanisms remain incompletely understood.
  • Existing research suggests a potential role for both grammatical processing and executive functions in sentence comprehension deficits observed in FTD.

Purpose of the Study:

  • To investigate the contributions of grammatical and executive resource factors to sentence comprehension deficits in distinct FTD subgroups.
  • To differentiate the sentence processing profiles of patients with Progressive Non-fluent Aphasia (PNFA), executive deficits (EXEC), and Semantic Dementia (SD).
  • To correlate sentence comprehension performance with measures of executive resources and working memory.

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Main Methods:

  • Utilized both off-line sentence comprehension tasks and on-line sentence processing procedures to assess comprehension under varying resource demands.
  • Examined three FTD subgroups: PNFA (n=5), EXEC (n=8), and SD (n=3), alongside control subjects.
  • Correlated patient performance with standardized measures of executive functions, including working memory, planning, and inhibitory control.

Main Results:

  • PNFA patients exhibited significant off-line comprehension deficits correlated with auditory-verbal short-term memory, and slowed on-line processing, suggesting working memory degradation.
  • EXEC patients showed modest off-line difficulties linked to executive functions and insensitivity to sentence-based information during on-line processing.
  • SD patients' on-line sentence comprehension performance was comparable to controls, indicating preserved grammatical processing in this subgroup.

Conclusions:

  • Both grammatical and executive components are crucial for sentence comprehension, with their impairment contributing to FTD-related deficits.
  • The specific profile of sentence comprehension difficulty in FTD varies across subtypes, reflecting the underlying affected cognitive processes.
  • These findings highlight the complex interplay between linguistic and executive functions in maintaining sentence comprehension and inform differential diagnosis within FTD.