identification of stress placement in speakers with and without dysarthria pamela campellone thomas...
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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 Acoustic findings: Preserved prosodic
control at vowel & word level
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 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 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 listeners4 listeners per DYS-HC speaker pair
Listener Interface
86
88
90
92
94
96
98
100
1 2 3 4 5
Stress Location
% A
ccur
acy
A B C D N
HC Ave
DYS Ave
Acoustic Predictors of Listener Accuracy (p<0.01)
Machine Classification HC & DYS words classified as stressed
vs. unstressedHC accuracy: 98.1%DYS accuracy: 97.4%
Separate combinations of duration, intensity, & F0 used to determine which were most predictive
Accuracy by Acoustic Predictors
Predictor HC DYS
Dur 81.7 77.8
Int 89.9 88.3
F0 96.7 96.2
Dur + Int 95.3 92.0
Dur + F0 96.6 96.5
Int + F0 97.1 96.6
Dur + Int + F0 98.8 97.4
Conclusions Unfamiliar listeners & machine classifier
both highly accurate Communicative potential of prosody
Clinically: scaffolding for improved intelligibilityApplication: communication aids which utilize
prosodic variation
Future Directions Examine productions of speakers with
varying etiologies of DYSDifferences in acquired vs. congenital?
Assess prosodic control in more varied speech tasks
Design comprehensive interventions incorporating speaker and listener variables