Quantifying speech rhythm abnormalities in the dysarthrias

Julie Liss, Laurence White, Sven L. Mattys, Kaitlin Lansford, Andrew J. Lotto, Stephanie M. Spitzer, John N. Caviness

    Research output: Contribution to journalArticlepeer-review

    112 Scopus citations

    Abstract

    Purpose: In this study, the authors examined whether rhythm metrics capable of distinguishing languages with high and low temporal stress contrast also can distinguish among control and dysarthric speakers of American English with perceptually distinct rhythm patterns. Methods: Acoustic measures of vocalic and consonantal segment durations were obtained for speech samples from 55 speakers across 5 groups (hypokinetic, hyperkinetic, flaccid-spastic, ataxic dysarthrias, and controls). Segment durations were used to calculate standard and new rhythm metrics. Discriminant function analyses (DFAs) were used to determine which sets of predictor variables (rhythm metrics) best discriminated between groups (control vs. dysarthrias; and among the 4 dysarthrias). A cross-validation method was used to test the robustness of each original DFA. Results: The majority of classification functions were more than 80% successful in classifying speakers into their appropriate group. New metrics that combined successive vocalic and consonantal segments emerged as important predictor variables. DFAs pitting each dysarthria group against the combined others resulted in unique constellations of predictor variables that yielded high levels of classification accuracy. Conclusions: This study confirms the ability of rhythm metrics to distinguish control speech from dysarthrias and to discriminate dysarthria subtypes. Rhythm metrics show promise for use as a rational and objective clinical tool.

    Original languageEnglish (US)
    Pages (from-to)1334-1352
    Number of pages19
    JournalJournal of Speech, Language, and Hearing Research
    Volume52
    Issue number5
    DOIs
    StatePublished - Oct 1 2009

    Keywords

    • Dysarthria
    • Rhythm metrics
    • Speech rhythm

    ASJC Scopus subject areas

    • Language and Linguistics
    • Linguistics and Language
    • Speech and Hearing

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