The Interaction of Lexical Characteristics and Speech Production in Parkinson's Disease Purpose This study sought to investigate the interaction of speech movement execution with higher order lexical parameters. The authors examined how lexical characteristics affect speech output in individuals with Parkinson's disease (PD) and healthy control (HC) speakers. Method Twenty speakers with PD and 12 healthy speakers read sentences ... Research Article
Research Article  |   January 01, 2017
The Interaction of Lexical Characteristics and Speech Production in Parkinson's Disease
 
Author Affiliations & Notes
  • Yi-Fang Chiu
    Department of Communication Sciences and Disorders, Saint Louis University, St. Louis, MO
  • Karen Forrest
    Department of Speech and Hearing Sciences, Indiana University, Bloomington
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Yi-Fang Chiu: chiuy@slu.edu
  • Editor: Amy Neel
    Editor: Amy Neel×
  • Associate Editor: Amy Neel
    Associate Editor: Amy Neel×
Article Information
Hearing & Speech Perception / Acoustics / Special Populations / Older Adults & Aging / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   January 01, 2017
The Interaction of Lexical Characteristics and Speech Production in Parkinson's Disease
Journal of Speech, Language, and Hearing Research, January 2017, Vol. 60, 13-23. doi:10.1044/2016_JSLHR-S-15-0333
History: Received September 23, 2015 , Revised March 10, 2016 , Accepted June 30, 2016
 
Journal of Speech, Language, and Hearing Research, January 2017, Vol. 60, 13-23. doi:10.1044/2016_JSLHR-S-15-0333
History: Received September 23, 2015; Revised March 10, 2016; Accepted June 30, 2016

Purpose This study sought to investigate the interaction of speech movement execution with higher order lexical parameters. The authors examined how lexical characteristics affect speech output in individuals with Parkinson's disease (PD) and healthy control (HC) speakers.

Method Twenty speakers with PD and 12 healthy speakers read sentences with target words that varied in word frequency and neighborhood density. The formant transitions (F2 slopes) of the diphthongs in the target words were compared across lexical categories between PD and HC groups.

Results Both groups of speakers produced steeper F2 slopes for the diphthongs in less frequent words and words from sparse neighborhoods. The magnitude of the increase in F2 slopes was significantly less in the PD than HC group. The lexical effect on the F2 slope differed among the diphthongs and between the 2 groups.

Conclusions PD and healthy speakers varied their acoustic output on the basis of word frequency and neighborhood density. F2 slope variations can be traced to higher level lexical differences. This lexical effect on articulation, however, appears to be constrained by PD.

Acknowledgments
We sincerely thank the individuals with Parkinson's disease for participating in this research. We also thank Carolyn Richie and Mary Gospel for the additional data collection site.
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