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On-line syntactic processing in aphasia: studies with auditory moving window presentation.

David Caplan1, Gloria Waters

  • 1Neuropsychology Laboratory, Department of Neurology, Vincent Burnham 827, Massachusetts General Hospital, Fruit Street, Boston, MA 02114, USA. dcaplan@partners.org

Brain and Language
|February 20, 2003
PubMed
Summary

Aphasic patients show difficulties with sentence plausibility judgments, especially with complex syntax. However, many retain online syntactic processing abilities, with variations based on comprehension level and diagnosis.

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Neurolinguistics

Background:

  • Aphasia following left hemisphere stroke often impairs language comprehension.
  • Understanding the online processing of syntactic structures in aphasia is crucial for characterizing comprehension deficits.

Purpose of the Study:

  • To investigate online syntactic processing in aphasic patients using an auditory moving windows task.
  • To examine how syntactic complexity affects plausibility judgments in patients with aphasia compared to controls.
  • To explore the relationship between comprehension level, clinical diagnosis, and online syntactic processing in aphasia.

Main Methods:

  • Twenty-eight aphasic patients and matched controls participated.
  • An auditory moving windows task was employed, presenting sentence phrases sequentially.

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  • Subjects made self-paced button presses and timed plausibility judgments for sentences varying in syntactic complexity.

    • Main Results:

    • Aphasic patients made more errors and judgments took longer than controls.
    • Syntactic complexity significantly impacted plausibility judgments more in patients than controls.
    • High-performing aphasic patients showed similar online syntactic effects to controls, unlike low-performing patients.
    • Broca's aphasic patients appeared to not process complex syntax online, while fluent aphasics' impairments occurred post-online processing.

    Conclusions:

    • Many aphasic patients can process syntactic structure online, despite comprehension deficits.
    • Different subgroups of aphasic patients exhibit distinct patterns of online syntactic processing based on their comprehension abilities and clinical diagnosis.
    • These findings aid in differentiating subtypes of syntactic comprehension disorders in aphasia.