Coarticulation has been studied extensively in neurologically normal speakers and figures prominently in theories of normal speech production. In so far as coarticulation presumably would have a similar status in a speech production theory of dysarthria, and a basic understanding of coarticulation is essential for elaborating such a theory, research investigating coarticulation in dysarthria appears warranted. The idea that coarticulation influences perceptual impressions of precision further indicates that studies investigating coarticulatory patterns in dysarthria may suggest articulatory characteristics that could be targeted in therapy to improve precision. The current project aims to study anticipatory coarticulation for speakers with Amyotrophic Lateral Sclerosis (ALS), Parkinson disease (PD), and Multiple Sclerosis (MS), as inferred from the acoustic signal. Neurologically healthy speakers will be studied for comparison purposes. The Perceptual-Acoustic Theory (PAT), a theory of normal speech production theory, will be used as a starting point for studying anticipatory coarticulation in PD, ALS, and MS. Specific predictions that the PAT suggests concerning anticipatory coarticulation for neurologic speakers will be tested. One goal of the project is to characterize anticipatory coarticulation for the typical or habitual speech of individuals with ALS, MS, and PD. A second goal is to determine the effects of two treatment techniques - slowed articulatory rate and increased vocal intensity- on anticipatory coarticulation in ALS, MS, and PD. A third goal is to document the relationship between perceptual impressions of precision and coarticulation. Second formant (F2) frequency values, first moment coefficients, and consonant F2 measures will be used to infer coarticulation. Scaled estimates of precision also will be related to select acoustic measures of coarticulation.

National Institute of Health (NIH)
National Institute on Deafness and Other Communication Disorders (NIDCD)
Research Project (R01)
Project #
Application #
Study Section
Special Emphasis Panel (ZRG1-BBBP-7 (01))
Program Officer
Shekim, Lana O
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
State University of New York at Buffalo
Schools of Arts and Sciences
United States
Zip Code
Feenaughty, Lynda; Tjaden, Kris; Weinstock-Guttman, Bianca et al. (2018) Separate and Combined Influence of Cognitive Impairment and Dysarthria on Functional Communication in Multiple Sclerosis. Am J Speech Lang Pathol 27:1051-1065
Martel-Sauvageau, Vincent; Tjaden, Kris (2017) Vocalic transitions as markers of speech acoustic changes with STN-DBS in Parkinson's Disease. J Commun Disord 70:1-11
Tjaden, Kris; Martel-Sauvageau, Vincent (2017) Consonant Acoustics in Parkinson's Disease and Multiple Sclerosis: Comparison of Clear and Loud Speaking Conditions. Am J Speech Lang Pathol 26:569-582
Stipancic, Kaila L; Tjaden, Kris; Wilding, Gregory (2016) Comparison of Intelligibility Measures for Adults With Parkinson's Disease, Adults With Multiple Sclerosis, and Healthy Controls. J Speech Lang Hear Res 59:230-8
Kuo, Christina; Tjaden, Kris (2016) Acoustic variation during passage reading for speakers with dysarthria and healthy controls. J Commun Disord 62:30-44
Lam, Jennifer; Tjaden, Kris (2016) Clear Speech Variants: An Acoustic Study in Parkinson's Disease. J Speech Lang Hear Res 59:631-46
Tjaden, Kris; Kain, Alexander; Lam, Jennifer (2014) Hybridizing conversational and clear speech to investigate the source of increased intelligibility in speakers with Parkinson's disease. J Speech Lang Hear Res 57:1191-205
Tjaden, Kris; Sussman, Joan E; Wilding, Gregory E (2014) Impact of clear, loud, and slow speech on scaled intelligibility and speech severity in Parkinson's disease and multiple sclerosis. J Speech Lang Hear Res 57:779-92
Feenaughty, Lynda; Tjaden, Kris; Sussman, Joan (2014) Relationship between acoustic measures and judgments of intelligibility in Parkinson's disease: a within-speaker approach. Clin Linguist Phon 28:857-78
Kuo, Christina; Tjaden, Kris; Sussman, Joan E (2014) Acoustic and perceptual correlates of faster-than-habitual speech produced by speakers with Parkinson's disease and multiple sclerosis. J Commun Disord 52:156-69

Showing the most recent 10 out of 30 publications