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No AccessJournal of Speech, Language, and Hearing ResearchResearch Article1 Aug 2014

Cognitive–Perceptual Examination of Remediation Approaches to Hypokinetic Dysarthria

    https://doi.org/10.1044/2014_JSLHR-S-12-0349

    Abstract

    Purpose

    To determine how increased vocal loudness and reduced speech rate affect listeners' cognitive–perceptual processing of hypokinetic dysarthric speech associated with Parkinson's disease.

    Method

    Fifty-one healthy listener participants completed a speech perception experiment. Listeners repeated phrases produced by 5 individuals with dysarthria across habitual, loud, and slow speaking modes. Listeners were allocated to habitual (n = 17), loud (n = 17), or slow (n = 17) experimental conditions. Transcripts derived from the phrase repetition task were coded for overall accuracy (i.e., intelligibility), and perceptual error analyses examined how these conditions affected listeners' phonemic mapping (i.e., syllable resemblance) and lexical segmentation (i.e., lexical boundary error analysis).

    Results

    Both speech conditions provided obvious perceptual benefits to listeners. Overall, transcript accuracy was highest in the slow condition. In the loud condition, however, improvement was evidenced across the experiment. An error analysis suggested that listeners in the loud condition prioritized acoustic–phonetic cues in their attempts to resolve the degraded signal, whereas those in the slow condition appeared to preferentially weight lexical stress cues.

    Conclusions

    Increased loudness and reduced rate exhibited differential effects on listeners' perceptual processing of dysarthric speech. The current study highlights the insights that may be gained from a cognitive–perceptual approach.

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