Identification of stress placement in speakers with and without dysarthria
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Identification of Stress Placement in Speakers with and without Dysarthria. Pamela Campellone Thomas DiCicco Rupal Patel. Background. Traditional research focus in dysarthria due to CP: Articulation More recent research: Prosody

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Identification of Stress Placement in Speakers with and without Dysarthria

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Identification of stress placement in speakers with and without dysarthria

Identification of Stress Placement in Speakers with and without Dysarthria

Pamela Campellone

Thomas DiCicco

Rupal Patel


Background

Background

  • Traditional research focus in dysarthria due to CP: Articulation

  • More recent research: Prosody

  • Acoustic findings: Preserved prosodic control at vowel & word level


Background1

Background

  • Are acoustic signals consistent and reliable?

  • Can humans and/or machines make use of these signals?

  • If prosody is a strength, can it be harnessed to improve segmental clarity?


Research questions

Research Questions

  • Can listeners identify stress within phrases produced by speakers with dysarthria & age-gender matched healthy controls?

  • How accurate is machine classification of prosodic contrasts?


Method

Method

  • Spoken database: 12 speakers with dysarthria (DYS) & 12 healthy controls (HC)

    • 5 phrases (4 monosyllabic words) produced with stress on 1 of the 4 words or neutrally

  • 48 monolingual speakers of American English served as listeners

    • 4 listeners per DYS-HC speaker pair


Listener interface

Listener Interface


Acoustic predictors of listener accuracy p 0 01

Acoustic Predictors of Listener Accuracy (p<0.01)


Machine classification

Machine Classification

  • HC & DYS words classified as stressed vs. unstressed

    • HC accuracy: 98.1%

    • DYS accuracy: 97.4%

  • Separate combinations of duration, intensity, & F0 used to determine which were most predictive


Accuracy by acoustic predictors

Accuracy by Acoustic Predictors


Conclusions

Conclusions

  • Unfamiliar listeners & machine classifier both highly accurate

  • Communicative potential of prosody

    • Clinically: scaffolding for improved intelligibility

    • Application: communication aids which utilize prosodic variation


Future directions

Future Directions

  • Examine productions of speakers with varying etiologies of DYS

    • Differences in acquired vs. congenital?

  • Assess prosodic control in more varied speech tasks

  • Design comprehensive interventions incorporating speaker and listener variables


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