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Quantifier comprehension in corticobasal degeneration.

Corey T McMillan1, Robin Clark, Peachie Moore

  • 1Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia, PA, USA.

Brain and Cognition
|September 5, 2006
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Patients with corticobasal degeneration (CBD) show impaired quantifier comprehension due to number knowledge deficits. Alzheimer's disease (AD) and frontotemporal dementia (FTD) patients struggle with complex quantifiers, highlighting working memory's role.

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Area of Science:

  • Neuroscience
  • Linguistics
  • Cognitive Psychology

Background:

  • Generalized quantifiers (e.g., "some", "less than half") are crucial for language comprehension.
  • Understanding these quantifiers may rely on distinct cognitive abilities like number knowledge and working memory.

Purpose of the Study:

  • To investigate the linguistic distinction between classes of generalized quantifiers.
  • To examine the roles of number knowledge and working memory in quantifier comprehension.
  • To explore the neural underpinnings of quantifier processing in neurodegenerative diseases.

Main Methods:

  • Studied patients with focal neurodegenerative diseases: corticobasal degeneration (CBD), Alzheimer's disease (AD), and frontotemporal dementia (FTD).
  • Compared quantifier comprehension in patient groups and healthy seniors.
  • Analyzed comprehension of first-order versus higher-order quantifiers.

Main Results:

  • CBD patients, with number knowledge impairments, showed significantly lower quantifier comprehension than controls, AD, and FTD patients.
  • FTD and AD patients, with working memory limitations, exhibited greater difficulty with higher-order quantifiers compared to first-order quantifiers.
  • Findings suggest number knowledge and working memory are dissociable components of quantifier meaning.

Conclusions:

  • Generalized quantifier comprehension relies on both number knowledge and working memory.
  • These cognitive components are supported by distinct brain regions, as evidenced by differential deficits in patient groups.
  • The study clarifies the cognitive architecture underlying complex linguistic structures.