The Effect of Delayed Auditory Feedback on the Speech Quality of Non-Hypokinetic Type Dysarthrias

  • Shimura Eiji
    Department of Speech, Language, and Hearing Sciences, Niigata University of Health and Welfare
  • Kakehi Kazuhiko
    School of Information Science & Technology, Chukyo University

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  • Dysarthria例の発話特性における遅延聴覚フィードバック(DAF)の効果―運動低下性タイプ以外の例に対する検討―
  • ─運動低下性タイプ以外の例に対する検討─

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Abstract

This study investigated the effect of delayed auditory feedback (DAF) on non-hypokinetic type dysarthrias, including one UUMN, two ataxics, and two mixed cases. The set of tasks consisted of both spontaneous speech and a long-sentence reading. The task set was conducted under two conditions: one without DAF (condition A) and another with DAF (condition B). The task set under the two conditions was performed once per week in the order of A, B, and A. The results showed that speech intelligibility improved in four of the five cases under the DAF condition, suggesting that DAF is effective for dysarthrias other than the hypokinetic type. An additional analysis was conducted to examine the relationship between improvement of speech intelligibility and acoustic characteristics (reduction of speaking rate, extension of vowel length, expansion of vowel space in the F1-F2 space, etc.). The causes for speech intelligibility improvement due to DAF usage are discussed based on the analysis.

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