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Assessing resource demands during sentence processing in Parkinson's disease
Murray Grossman1, Christine Lee, Jennifer Morris
1Department of Neurology, University of Pennsylvania, Philadelphia, USA. mgrossma@mail.med.upenn.edu
Brain and Language
|March 19, 2002
Summary
Parkinson's disease (PD) patients show sentence comprehension issues. While grammatical processing is intact, executive resource limitations likely cause these difficulties in PD.
Area of Science:
- Neurology
- Psycholinguistics
Background:
- Patients with Parkinson's disease (PD) often experience sentence comprehension difficulties.
- The underlying cause remains unclear, with debates on whether it stems from grammatical processing deficits or executive resource limitations.
Purpose of the Study:
- To investigate grammatical processing in PD patients while minimizing task demands.
- To differentiate between grammatical deficits and executive resource limitations in PD-related comprehension impairments.
Main Methods:
- Utilized an "on-line" word detection procedure to assess sensitivity to grammatical agreements in sentences.
- Administered a traditional, resource-demanding sentence comprehension task.
- Assessed executive resource measures in PD patients.
Main Results:
- PD patients and controls exhibited equal sensitivity to grammatical agreement violations using the word detection method.
- PD patients showed significant impairment in comprehending object-gap subordinate clauses compared to subject-gap clauses.
- Impaired executive resource measures in PD correlated with comprehension performance.
Conclusions:
- PD patients' executive resource limitations, not grammatical processing deficits, contribute to sentence comprehension difficulties.
- The findings highlight the role of executive functions in language processing for individuals with PD.