Vowel Articulation in Parkinson's Disease

Skodda, Sabine; Visser, W.; Schlegel, Uwe

doi:10.1016/j.jvoice.2010.01.009

Cited by 209 publications

(168 citation statements)

References 31 publications

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“…At the suprasegmental level, speakers with PD tend to pause more often (Torp & Hammen, 2000; but see Goberman & Elmer, 2005), utilize an increased fundamental frequency (F0; Canter, 1963;Goberman, Coelho, & Robb, 2002), and exhibit decreased variability in F0 (Canter, 1963(Canter, , 1965Flint, Black, Campbell-Taylor, Gailey, & Levinton, 1992;Skodda, Visser, & Schlegel, 2011a). Some studies have also reported reduced sound pressure levels (SPLs; Fox & Ramig, 1997;Skodda, Visser, & Schlegel, 2011b;Tjaden et al, 2013;Walsh & Smith, 2011). However, other studies have reported no differences in mean SPL for speakers with PD relative to healthy controls (Canter, 1963;Sadagopan & Huber, 2007;Tjaden & Wilding, 2004).…”

Section: Acoustic Characteristics Of Pdmentioning

confidence: 99%

“…Similar to Lam et al (2012), the greatest VSAs were produced in the overenunciate condition, followed by the hearing impaired and clear conditions. Although researchers have suggested that other vowel metrics such as vowel articulation index (VAI) and formant centralization ratio (FCR) are shown to be more sensitive to articulatory impairment in dysarthria (Sapir, Ramig, Spielman, & Fox, 2010;Skodda et al, 2011b), recent work by Lansford and Liss (2014) showed that VSA (80% accuracy) outperformed FCR (70% accuracy) in classifying speakers with dysarthria, despite the fact that the two metrics were highly correlated. Moreover, it has been suggested that speech production measures used to evaluate therapeutic effects should be able to index functional speech abilities (i.e., intelligibility; Weismer, Yunusova, & Bunton, 2012).…”

Section: Condition Effects: Segmental Measuresmentioning

confidence: 99%

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Clear Speech Variants: An Acoustic Study in Parkinson's Disease

Lam

Tjaden

2016

J Speech Lang Hear Res

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Purpose The authors investigated how different variants of clear speech affect segmental and suprasegmental acoustic measures of speech in speakers with Parkinson's disease and a healthy control group. Method A total of 14 participants with Parkinson's disease and 14 control participants served as speakers. Each speaker produced 18 different sentences selected from the Sentence Intelligibility Test (Yorkston & Beukelman, 1996). All speakers produced stimuli in 4 speaking conditions (habitual, clear, overenunciate, and hearing impaired). Segmental acoustic measures included vowel space area and first moment (M1) coefficient difference measures for consonant pairs. Second formant slope of diphthongs and measures of vowel and fricative durations were also obtained. Suprasegmental measures included fundamental frequency, sound pressure level, and articulation rate. Results For the majority of adjustments, all variants of clear speech instruction differed from the habitual condition. The overenunciate condition elicited the greatest magnitude of change for segmental measures (vowel space area, vowel durations) and the slowest articulation rates. The hearing impaired condition elicited the greatest fricative durations and suprasegmental adjustments (fundamental frequency, sound pressure level). Conclusions Findings have implications for a model of speech production for healthy speakers as well as for speakers with dysarthria. Findings also suggest that particular clear speech instructions may target distinct speech subsystems.

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Section: Acoustic Characteristics Of Pdmentioning

confidence: 99%

Section: Condition Effects: Segmental Measuresmentioning

confidence: 99%

Clear Speech Variants: An Acoustic Study in Parkinson's Disease

Lam

Tjaden

2016

J Speech Lang Hear Res

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“…7 This articulatory undershoot may lead to alterations in some acoustical parameters that are typical of articulation, such as the reduction of the second formant transition slope or a reduction of the triangular vowel space area. [9][10][11] Several approaches and methods have been implemented to describe the kinematic characteristics of the articulators in hypokinetic dysarthria associated with PD. Most studies [12][13][14][15][16][17][18] pointed out a reduction in terms of velocity and range of movements of the articulators, although results of unimpaired articulatory movements in Parkinsonian patients were also presented.…”

Section: Introductionmentioning

confidence: 99%

Markerless Analysis of Articulatory Movements in Patients With Parkinson's Disease

et al. 2016

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Summary: Objectives. A large percentage of patients with Parkinson's disease have hypokinetic dysarthria, exhibiting reduced peak velocities of jaw and lips during speech. This limitation implies a reduction of speech intelligibility for such patients. This work aims at testing a cost-effective markerless approach for assessing kinematic parameters of hypokinetic dysarthria. Study Design. Kinematic parameters of the lips are calculated during a syllable repetition task from 14 Parkinsonian patients and 14 age-matched control subjects. Methods. Combining color and depth frames provided by a depth sensor (Microsoft Kinect), we computed the threedimensional coordinates of main facial points. The peak velocities and accelerations of the lower lip during a syllable repetition task are considered to compare the two groups. Results. Results show that Parkinsonian patients exhibit reduced peak velocities of the lower lip, both during the opening and the closing phase of the mouth. In addition, peak values of acceleration are reduced in Parkinsonian patients, although with significant differences only in the opening phase with respect to healthy control subjects. Conclusions. The novel contribution of this work is the implementation of an entirely markerless technique capable to detect signs of hypokinetic dysarthria for the analysis of articulatory movements during speech. Although a large number of Parkinsonian patients have hypokinetic dysarthria, only a small percentage of them undergoes speech therapy to increase their articulatory movements. The system proposed here could be easily implemented in a home environment, thus, increasing the percentage of patients who can perform speech rehabilitation at home.

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“…At the segmental level, researchers have focussed on the amplitude and duration of speech gestures. It has been shown that impairments in vowel articulation are present even in mildly affected patients and deteriorate significantly in the course of the illness [5], [6], [7], [8], [9]. Micro adjustments in the movements of the articulators determine changes in the frequency of the first two vowel formants in the production of vowels, with a modification of their acoustic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Speech Rhythm in Parkinson’s Disease: A Study on Italian

Pettorino¹,

Busà²,

Pellegrino³

2016

Interspeech 2016

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Experimental studies on different languages have shown that neurogenetic disorders connected with Parkinson's disease (PD) determine a series of variations in the speech rhythm. This study aims at verifying whether the speech of PD patients presents rhythmic abnormalities compared to healthy speakers also in Italian. The read speech of 15 healthy speakers and of 11 patients with mild PD was segmented in consonantal and vocalic portions. After extracting the durations of all segments, the vowel percentage (%V) and the interval between two consecutive vowel onset points (VtoV) were calculated. The results show that %V has significantly different values in mildly affected patients as compared to controls. For Italian, %V spans between 44% and 50% for healthy subjects and between 51% and 58% for PD subjects. A positive correlation was found between %V and the number of years of PD since its insurgence. The correlation with the age at which the disease insurges is weak. With regard to VtoV, PD subjects do not speak at a significantly slower rate than healthy controls, though a trend in this direction was found. The data suggest that %V could be used as a more reliable parameter for the early diagnosis of PD than speech rate. AbstractExperimental studies on different languages have shown that neurogenetic disorders connected with Parkinson's disease (PD) determine a series of variations in the speech rhythm. This study aims at verifying whether the speech of PD patients presents rhythmic abnormalities compared to healthy speakers also in Italian. The read speech of 15 healthy speakers and of 11 patients with mild PD was segmented in consonantal and vocalic portions. After extracting the durations of all segments, the vowel percentage (%V) and the interval between two consecutive vowel onset points (VtoV) were calculated. The results show that %V has significantly different values in mildly affected patients as compared to controls. For Italian, %V spans between 44% and 50% for healthy subjects and between 51% and 58% for PD subjects. A positive correlation was found between %V and the number of years of PD since its insurgence. The correlation with the age at which the disease insurges is weak. With regard to VtoV, PD subjects do not speak at a significantly slower rate than healthy controls, though a trend in this direction was found. The data suggest that %V could be used as a more reliable parameter for the early diagnosis of PD than speech rate.

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Vowel Articulation in Parkinson's Disease

Cited by 209 publications

References 31 publications

Clear Speech Variants: An Acoustic Study in Parkinson's Disease

Clear Speech Variants: An Acoustic Study in Parkinson's Disease

Markerless Analysis of Articulatory Movements in Patients With Parkinson's Disease

Speech Rhythm in Parkinson’s Disease: A Study on Italian

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