Hybridizing Conversational and Clear Speech to Investigate the Source of Increased Intelligibility in Speakers With Parkinson's Disease Purpose A speech analysis-resynthesis paradigm was used to investigate segmental and suprasegmental acoustic variables explaining intelligibility variation for 2 speakers with Parkinson's disease (PD). Method Sentences were read in conversational and clear styles. Acoustic characteristics from clear sentences were extracted and applied to conversational sentences, yielding 6 hybridized versions ... Research Article
Research Article  |   August 01, 2014
Hybridizing Conversational and Clear Speech to Investigate the Source of Increased Intelligibility in Speakers With Parkinson's Disease
 
Author Affiliations & Notes
  • Kris Tjaden
    University at Buffalo, NY
  • Alexander Kain
    Center for Spoken Language Understanding, Oregon Health and Science University, Portland
  • Jennifer Lam
    University at Buffalo, NY
  • 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 Kris Tjaden: tjaden@buffalo.edu
  • Editor: Jody Kreiman
    Editor: Jody Kreiman×
  • Associate Editor: Julie Liss
    Associate Editor: Julie Liss×
Article Information
Speech, Voice & Prosodic Disorders / Special Populations / Older Adults & Aging / Normal Language Processing / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   August 01, 2014
Hybridizing Conversational and Clear Speech to Investigate the Source of Increased Intelligibility in Speakers With Parkinson's Disease
Journal of Speech, Language, and Hearing Research, August 2014, Vol. 57, 1191-1205. doi:10.1044/2014_JSLHR-S-13-0086
History: Received April 5, 2013 , Revised August 9, 2013 , Accepted December 11, 2013
 
Journal of Speech, Language, and Hearing Research, August 2014, Vol. 57, 1191-1205. doi:10.1044/2014_JSLHR-S-13-0086
History: Received April 5, 2013; Revised August 9, 2013; Accepted December 11, 2013
Web of Science® Times Cited: 6

Purpose A speech analysis-resynthesis paradigm was used to investigate segmental and suprasegmental acoustic variables explaining intelligibility variation for 2 speakers with Parkinson's disease (PD).

Method Sentences were read in conversational and clear styles. Acoustic characteristics from clear sentences were extracted and applied to conversational sentences, yielding 6 hybridized versions of sentences in which segment durations, short-term spectrum, energy characteristics, or fundamental frequency characteristics for clear productions were applied individually or in combination to conversational productions. Listeners (N = 20) judged intelligibility in transcription and scaling tasks.

Results Intelligibility increases above conversation were more robust for transcription, but the pattern of intelligibility improvement was similar across tasks. For 1 speaker, hybridization involving only clear energy characteristics yielded an 8.7% improvement in transcription intelligibility above conversation. For the other speaker, hybridization involving clear spectrum yielded an 18% intelligibility improvement, whereas hybridization involving both clear spectrum and duration yielded a 13.4% improvement.

Conclusions Not all production changes accompanying clear speech explain its improved intelligibility. Suprasegmental adjustments contributed to intelligibility improvements when segmental adjustments, as inferred from vowel space area, were not robust. Hybridization can be used to identify acoustic variables explaining intelligibility variation in mild dysarthria secondary to PD.

Acknowledgments
This work was supported by National Institute on Deafness and Other Communication Disorders Grant R01DC004689 and National Science Foundation Grant IIS-0915754.
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