Anticipatory coarticulation and stability of speech in typically fluent speakers and people who stutter

Frisch, Stefan A.; Maxfield, Nathan D.; Belmont, Alissa

doi:10.3109/02699206.2015.1137632

Cited by 17 publications

(13 citation statements)

References 41 publications

(77 reference statements)

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“…everal studies indicate that movements of articulators differ in people who stutter (PWS) compared with people who are typically fluent (PWTF; Frisch et al, 2016;Howell et al, 2009;Jackson et al, 2016;Loucks & De Nil, 2006;Loucks et al, 2007;Sasisekaran, 2013;Smith et al, 2010). These kinematic differences were evident even when the speech produced was perceptually fluent, that is, it appeared to lack disfluencies.…”

mentioning

confidence: 99%

Speech Movement Variability in People Who Stutter: A Vocal Tract Magnetic Resonance Imaging Study

Wiltshire

Chiew

Chesters

et al. 2021

J Speech Lang Hear Res

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Purpose People who stutter (PWS) have more unstable speech motor systems than people who are typically fluent (PWTF). Here, we used real-time magnetic resonance imaging (MRI) of the vocal tract to assess variability and duration of movements of different articulators in PWS and PWTF during fluent speech production. Method The vocal tracts of 28 adults with moderate to severe stuttering and 20 PWTF were scanned using MRI while repeating simple and complex pseudowords. Midsagittal images of the vocal tract from lips to larynx were reconstructed at 33.3 frames per second. For each participant, we measured the variability and duration of movements across multiple repetitions of the pseudowords in three selected articulators: the lips, tongue body, and velum. Results PWS showed significantly greater speech movement variability than PWTF during fluent repetitions of pseudowords. The group difference was most evident for measurements of lip aperture using these stimuli, as reported previously, but here, we report that movements of the tongue body and velum were also affected during the same utterances. Variability was not affected by phonological complexity. Speech movement variability was unrelated to stuttering severity within the PWS group. PWS also showed longer speech movement durations relative to PWTF for fluent repetitions of multisyllabic pseudowords, and this group difference was even more evident as complexity increased. Conclusions Using real-time MRI of the vocal tract, we found that PWS produced more variable movements than PWTF even during fluent productions of simple pseudowords. PWS also took longer to produce multisyllabic words relative to PWTF, particularly when words were more complex. This indicates general, trait-level differences in the control of the articulators between PWS and PWTF. Supplemental Material https://doi.org/10.23641/asha.14782092

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mentioning

confidence: 99%

Speech Movement Variability in People Who Stutter: A Vocal Tract Magnetic Resonance Imaging Study

Wiltshire

Chiew

Chesters

et al. 2021

J Speech Lang Hear Res

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“…Nevertheless, combining our new results from spectral analyses of fluent single-word utterances in one specific phonetic context with others’ findings for fluent speech analyzed in the acoustic domain with locus equations (e.g., Chang et al, 2002; Sussman et al, 2011) or in the kinematic domain with ultrasound imaging (Frisch et al, 2016), as well as formant transition analyses of dysfluent speech (Harrington, 1987; Howell & Vause, 1986), the evidence to date strongly suggests that anticipatory coarticulation is an aspect of speech motor control that does not differ in stuttering versus nonstuttering individuals. Considered in a broader theoretical context, measures of anticipatory coarticulation quantify processes directly and specifically related to the relative timing of overlapping postures and movements (in the present study the onset and progression of vowel-related articulatory movements relative to those involved in creating the explosive burst for the preceding stop consonant).…”

Section: Discussionmentioning

confidence: 62%

“…A different approach to examining anticipatory coarticulation in the speech of individuals who stutter has focused on perceptually fluent utterances 2 . Frisch, Maxfield, and Belmont (2016) compared anticipatory coarticulation in adults who do and who do not stutter by means of kinematic data (ultra sound images) showing tongue position during velar consonant-vowel transitions with vowels that differed in tongue advancement. The obtained results revealed no between-group differences.…”

mentioning

confidence: 99%

Spectral Coefficient Analyses of Word-Initial Stop Consonant Productions Suggest Similar Anticipatory Coarticulation for Stuttering and Nonstuttering Adults

Maruthy¹,

Feng

Max

2017

Lang Speech

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A longstanding hypothesis about the sensorimotor mechanisms underlying stuttering suggests that stuttered speech dysfluencies result from a lack of coarticulation. Formant-based measures of either the stuttered or fluent speech of children and adults who stutter have generally failed to obtain compelling evidence in support of the hypothesis that these individuals differ in the timing or degree of coarticulation. Here, we used a sensitive acoustic technique-spectral coefficient analyses-that allowed us to compare stuttering and nonstuttering speakers with regard to vowel-dependent anticipatory influences as early as the onset burst of a preceding voiceless stop consonant. Eight adults who stutter and eight matched adults who do not stutter produced CVC words, and the first four spectral coefficients were calculated for one analysis window centered on the burst of C and two subsequent windows covering the beginning of the aspiration phase. Findings confirmed that the combined use of four spectral coefficients is an effective method for detecting the anticipatory influence of a vowel on the initial burst of a preceding voiceless stop consonant. However, the observed patterns of anticipatory coarticulation showed no statistically significant differences, or trends toward such differences, between the stuttering and nonstuttering groups. Combining the present results for fluent speech in one given phonetic context with prior findings from both stuttered and fluent speech in a variety of other contexts, we conclude that there is currently no support for the hypothesis that the fluent speech of individuals who stutter is characterized by limited coarticulation.

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“…This metric is used to quantify the overall difference between a pair of tongue curves, based on the mean of all the Euclidean distances between each point on one curve and its nearest neighbour on the other. According to Zharkova et al (2011) and Frisch et al (2016), the average distance between curves corresponding to different repetitions of the same vowel context (henceforth, within-set distances: WS) can be interpreted as a measure of speech motor stability for individual speakers: the greater the separation between curves belonging to the same category, the higher the variability of tongue movements across repetitions.…”

Section: Articulatory Analysismentioning

confidence: 99%

Vowel variability and contrast in Childhood Apraxia of Speech: acoustics and articulation

Lenoci

Celata

Ricci

et al. 2020

Clinical Linguistics & Phonetics

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Anticipatory coarticulation and stability of speech in typically fluent speakers and people who stutter

Cited by 17 publications

References 41 publications

Speech Movement Variability in People Who Stutter: A Vocal Tract Magnetic Resonance Imaging Study

Speech Movement Variability in People Who Stutter: A Vocal Tract Magnetic Resonance Imaging Study

Spectral Coefficient Analyses of Word-Initial Stop Consonant Productions Suggest Similar Anticipatory Coarticulation for Stuttering and Nonstuttering Adults

Vowel variability and contrast in Childhood Apraxia of Speech: acoustics and articulation

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