Positional asymmetries in consonant production and intelligibility in dysarthric speech

Kim, Heejin; Gurevich, Naomi

doi:10.1080/02699206.2021.2019312

Cited by 6 publications

(1 citation statement)

References 55 publications

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“…These discrepancy between current findings and previous research might also be due to differences in tasks (F2 slopes extracted from individually produced words vs. sentences), as well as differences in diphthong identities. Furthermore, apart from deviant vowel production, a substantial contribution to intelligibility reduction in dysarthria is the production of imprecise consonants and consonant-vowel transitions [8,54,55], indicating a multi-faceted role of speech segment production in intelligibility decline.…”

Section: Correlational Analysesmentioning

confidence: 99%

Effects of Speaking Rate on Variability of Second Formant Frequency Transitions in Dysarthria

van Brenk,

Lowit,

Tjaden

2023

Folia Phoniatr Logop

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Introduction: This study examined the utility of multiple second formant (F2) slope metrics to capture differences in speech production for individuals with dysarthria and healthy controls as a function of speaking rate. In addition, the utility of F2 slope metrics for predicting severity of intelligibility impairment in dysarthria was examined. Methods: 23 speakers with Parkinson’s disease and mild to moderate hypokinetic dysarthria (HD), 9 speakers with various neurological diseases and mild to severe ataxic dysarthria (AD), and 26 age-matched healthy control speakers (CON) participated in a sentence repetition task. Sentences were produced at habitual, fast, and slow speaking rate. A variety of metrics were derived from the rising second formant (F2) transition portion of the diphthong /ai/. To obtain measures of intelligibility for the two clinical speaker groups, 15 undergraduate SLP students participated in a transcription experiment. Results: Significantly shallower slopes were found for the speakers with hypokinetic dysarthria compared to control speakers. Steeper F2 slopes were associated with increased speaking rate for all groups. Higher variability in F2 slope metrics was found for the speakers with ataxic dysarthria compared to the two other speaker groups. For both clinical speaker groups, there was a negative association between intelligibility and F2 slope variability metrics, indicating lower variability in speech production was associated with higher intelligibility. Discussion: F2 slope metrics were sensitive to dysarthria presence, dysarthria type and speaking rate. The current study provided evidence that the use of F2 slope variability measures has additional value to F2 slope averaged measures for predicting severity of intelligibility impairment in dysarthria.

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Section: Correlational Analysesmentioning

confidence: 99%

Effects of Speaking Rate on Variability of Second Formant Frequency Transitions in Dysarthria

van Brenk,

Lowit,

Tjaden

2023

Folia Phoniatr Logop

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Relating pronunciation distance metrics to intelligibility across English accents

Bent,

Henry,

Holt

et al. 2024

Journal of Phonetics

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Examination of Consonantal Phonetic Coverage in Standard Reading Passages

Gurevich

Kim

2022

Perspect ASHA SIGs

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Purpose: To be effective for clinical and research purposes, materials for eliciting speech should have phonetic coverage of a language, which necessarily includes both phonemic coverage (including all phonemes) and allophonic coverage (including positional contexts). The purpose of this work was to quantify allophonic coverage in widely used standard passages. Method: A total of 466 allowable contexts for 24 consonants in English were determined by taking into account positional contexts in terms of word positions, lexical stress, and proximity to other phonemes. The Caterpillar, The Grandfather Passage , and The Rainbow Passage were analyzed with respect to their phonetic coverage of these allowable contexts. Results: The standard passages achieved phonemic coverage, but their phonetic coverage was minimal: 24.89% in The Caterpillar , 27.25% in The Grandfather Passage , and 35.84% in The Rainbow Passage . Conclusion: Our analysis of three standard passages suggests the need for new speech materials that provide not only phonemic but also allophonic coverage so that production and perception of consonants can be examined as a function of their positional contexts.

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Positional asymmetries in consonant production and intelligibility in dysarthric speech

Cited by 6 publications

References 55 publications

Effects of Speaking Rate on Variability of Second Formant Frequency Transitions in Dysarthria

Effects of Speaking Rate on Variability of Second Formant Frequency Transitions in Dysarthria

Relating pronunciation distance metrics to intelligibility across English accents

Examination of Consonantal Phonetic Coverage in Standard Reading Passages

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