The proposed study investigates the role of sentence level fundamental frequency (F0) variation in speech intelligibility for persons with dysarthria associated with idiopathic Parkinson's disease (PD). It is of interest to know how prosody contributes to speech intelligibility deficits in developing an acoustic-phonetic model of speech intelligibility in dysarthria. The effects of segmental and suprasegmental variables on speech intelligibility have been addressed independently; however, few studies have been directed toward studying the interaction of segmental and suprasegmental variables and their effects on speech perception. Prosodic impairment, such as difficulty producing F0 variability across an utterance, may reduce the salience of acoustic cues to segment identity and have a detrimental effect on speech intelligibility. The primary aim of the proposed study is to look at changes in segment perception as a result of modification of the F0 contour. The study uses a speech resynthesis program that allows the investigator to modify F0 contours at the sentence level without affecting the timing and formant characteristics of the utterance. It is hypothesized that flattening of the F0 contour will increase segmental error rates, particularly for vowels. Enhancing the F0 contour to include the peaks and valleys typical in normal speakers will decrease segment error rates.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Small Research Grants (R03)
Project #
5R03DC005902-02
Application #
6765270
Study Section
Special Emphasis Panel (ZDC1-SRB-O (30))
Program Officer
Shekim, Lana O
Project Start
2003-08-01
Project End
2006-07-31
Budget Start
2004-08-01
Budget End
2005-07-31
Support Year
2
Fiscal Year
2004
Total Cost
$75,250
Indirect Cost
Name
University of Arizona
Department
Other Health Professions
Type
Schools of Arts and Sciences
DUNS #
806345617
City
Tucson
State
AZ
Country
United States
Zip Code
85721
Bunton, Kate; Kent, Raymond D; Duffy, Joseph R et al. (2007) Listener agreement for auditory-perceptual ratings of dysarthria. J Speech Lang Hear Res 50:1481-95
Keintz, Connie K; Bunton, Kate; Hoit, Jeannette D (2007) Influence of visual information on the intelligibility of dysarthric speech. Am J Speech Lang Pathol 16:222-34
Bunton, Kate (2006) Fundamental frequency as a perceptual cue for vowel identification in speakers with Parkinson's disease. Folia Phoniatr Logop 58:323-39