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The Lombard Effect on Speech Clarity in Patients with Parkinson Disease

AL-FWARESS, FIRAS SALER DAHER
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1208661860

Abstract Details

2008, PhD, University of Cincinnati, Allied Health Sciences : Communication Science and Disorders.
Vocal loudness tends to increase when healthy speakers are speaking in the presence of background noise. Acoustic studies of Lombard speech have shown that other articulatory changes associated with increased intelligibility occur along with the increase in loudness. Lombard speech in healthy speakers is characterized by decreased speaking rate, increased fundamental frequency range and mean, as well as increased vowel space. These results suggest a more complex interaction between auditory monitoring of speech and motor speech planning in this uncommon speaking environment. Recently, there has been increased interest in the effect of background noise on speakers with Parkinson Disease (PD). In this study, nineteen patients with Mild-to-Moderate Idiopathic PD (10 males and 9 females) and 19 age-and-sex matched healthy speakers were recruited to investigate these acoustic-phonetic measures in quiet and in Lombard conditions. A 90 dB SPL noise was given binaurally via a closed headset to induce the LE. Subjects were engaged in repeating the syllable chain /pataka/ and reading a set of phonetically balanced sentences. Speaking rate was measured by the diadochokinetic (DDK) task and speech rate (SR). Vocal loudness measures included intensity (INT) and intensity standard deviation (INTSD). Fundamental frequency range (F0Rge), mean (F0M), and standard deviation (F0SD) were the acoustic measures of fundamental frequency. The vowel space (VS) was obtained by measuring the vowel quadrilateral of the corner vowels /i, æ, a, u/ in the vocal tract. Repeated measures ANOVA results showed a statistically significant increase in vocal loudness measures, increase in F0 measures, and a decrease in speaking rate measures in both groups as a function of noise. The VS was not statistically different for both groups of participants in the Lombard condition. The male speakers in both groups showed increased VS compared to their female counterparts. The Parkinsonian group showed a smaller VS area in both conditions. In particular, the PD patients with moderate severity showed centralized VS compared to the healthy participants. These findings suggest that speakers with PD utilize neuromotor planning for speech production with the same capacity as non-impaired speakers; however, this capacity tends to deteriorate as PD becomes advanced.
Boyce Suzanne (Advisor)
Jean Neils-Strunjas (Committee Member)
Fredy Revilla (Committee Member)
Angel Ball (Committee Member)
126 p.
Speech Therapy
Lombard Effect; Speech Clarity; Parkinson Disease; Speech Rate; DDK; Vocal Loudness; Fundamental Frequency; Vowel Space; Speech Acoustic

Recommended Citations

Citations

  • AL-FWARESS, F. S. D. (2008). The Lombard Effect on Speech Clarity in Patients with Parkinson Disease [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1208661860

    APA Style (7th edition)

  • AL-FWARESS, FIRAS. The Lombard Effect on Speech Clarity in Patients with Parkinson Disease. 2008. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1208661860.

    MLA Style (8th edition)

  • AL-FWARESS, FIRAS. "The Lombard Effect on Speech Clarity in Patients with Parkinson Disease." Doctoral dissertation, University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1208661860

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Cincinnati and OhioLINK.