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    Lexical diversity in Parkinson’s disease

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    Author
    Ellis, Charles; Holt, Yolanda F; West, Thomas
    Abstract
    Background: Parkinson’s disease (PD) is a neurodegenerative syndrome of the basal ganglia (BG) believed to disrupt cortical-subcortical pathways critical to motor, cognitive and expressive language function. Recent studies have shown subtle deficits in expressive language performance among individuals with PD even in the earliest stage of the disease. The objective of this study was to use measures of lexical diversity to examine expressive language performance during discourse production in a sample of individuals with PD. Methods: Twelve individuals with idiopathic Parkinson’s disease (PD) were compared to twelve matched, neurologically intact controls on measures of lexical diversity. Three minute discourse samples describing a typical day were collected and analyzed for lexical diversity with the CHILDES program using measures of type token ratio (TTR) and voc-D (D). Results: Comparisons of three minute discourse samples indicated non-significant differences between individuals with PD and controls in word productivity (387 vs 356; p = .48). Similarly, there were also non-significant differences on measures of lexical diversity between the two groups (TTR = .45 vs.44; p = .50 and D 74 vs 68; p = .23). Conclusions: These results suggest that lexical diversity during discourse production among individuals with PD is similar to non-neurological controls. These findings indicate that lexical diversity is an aspect of expressive language performance that is not impacted by the disease process in the earliest stages.
    URI
    http://hdl.handle.net/10342/4737
    Subject
     Parkinson’s disease; Basal ganglia; Discourse; Language 
    Date
    2015-03-02
    Citation:
    APA:
    Ellis, Charles, & Holt, Yolanda F, & West, Thomas. (March 2015). Lexical diversity in Parkinson’s disease. Journal of Clinical Movement Disorders, 2(5), 1- 6. Retrieved from http://hdl.handle.net/10342/4737

    Display/Hide MLA, Chicago and APA citation formats.

    MLA:
    Ellis, Charles, and Holt, Yolanda F, and West, Thomas. "Lexical diversity in Parkinson’s disease". Journal of Clinical Movement Disorders. 2:5. (1-6), March 2015. September 26, 2023. http://hdl.handle.net/10342/4737.
    Chicago:
    Ellis, Charles and Holt, Yolanda F and West, Thomas, "Lexical diversity in Parkinson’s disease," Journal of Clinical Movement Disorders 2, no. 5 (March 2015), http://hdl.handle.net/10342/4737 (accessed September 26, 2023).
    AMA:
    Ellis, Charles, Holt, Yolanda F, West, Thomas. Lexical diversity in Parkinson’s disease. Journal of Clinical Movement Disorders. March 2015; 2(5): 1-6. http://hdl.handle.net/10342/4737. Accessed September 26, 2023.
    Collections
    • 2014-2015 Open Access Publishing Fund
    • Communication Sciences and Disorders
    • Open Access Fund
    • Open Access Publishing Support Fund

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