Office: 126 Cary Hall
Office Phone: 716.829.5564
Dr. Tjaden's Motor Speech Disorders Laboratory is located in 108/110 Cary Hall. The lab conducts research investigating the acoustic bases of reduced intelligibility and naturalness in dysarthria secondary to neurodegenerative disease such as Parkinson's disease and Multiple Sclerosis. One line of research aims to specify which therapeutic techniques for dysarthria yield improvements in speech intelligibility and naturalness - and the underlying supralaryngeal and prosodic adjustments responsible for those improvements. Additional studies are investigating the relationship between neuropsychological function and speech motor control characteristics in Multiple Sclerosis. We are also conducting studies, in collaboration with Dr. Alex Kain at the Center for Spoken Language Understanding (CSLU) at Oregon Health Sciences University, that aim to develop an acoustic model of intelligibility in dysarthria. The lab is presently funded by NIH-NIDCD R01DC004689 (PI; Tjaden).
Education / Training:
Employment / Professional Experience:
Professional Honors/ Advisory and Editorial
Selected recent publications:
Lam., J., & Tjaden, K. (in press). Clear speech variants: An acoustic study in Parkinson’s disease. Journal of Speech, Language, and Hearing Research.
Tjaden, K., Lam., J. & Feenaughty, L. (2015). Contemporary Issues in Dysarthria. In R. Bahr, & E. Silliman, (Eds). Handbook of Communication Disorders. (pp. 160-170). Oxford, UK: Routledge.
Stipancic, K. L., Tjaden, K., & Wilding, G. (2015). Comparison of Intelligibility Measures for Adults with Parkinson's Disease, Multiple Sclerosis and Healthy Controls. Journal of Speech, Language, and Hearing Research. doi: 10.1044/2015_jslhr-s-15-0271.
Kuo, C. Tjaden, K. & Sussman, J.E. (2014). Acoustic and Perceptual Correlates of Fast Speech Produced by Speakers with Parkinson’s Disease and Multiple Sclerosis. Journal of Communication Disorders. DOI: 10.1016/j.jcomdis.2014.09.002.
Feenaughty, L., Tjaden, K., & Sussman, J. (2014). Relationship between acoustic measures and judgments of intelligibility in Parkinson’s disease: A within – speaker approach. Clinical Linguistics and Phonetics, DOI: 10.3109/02699206.2014.921839.
Tjaden, K., Kain, A., & Lam, J. (2014). Hybridizing Conversational and Clear Speech to Investigate the Source of Increased Intelligibility in Parkinson’s Disease. Journal of Speech, Language and Hearing Research, 57, 1191-1205.
Tjaden, K., Sussman, J. & Wilding, G. (2014). Impact of Clear, Loud and Slow Speech on Scaled Estimates of Intelligibility and Speech Severity in Parkinson’s Disease and Multiple Sclerosis. Journal of Speech, Language & Hearing Research, 57, 779-792.
Lam, J., & Tjaden, K. (2013). Acoustic-perceptual relationships in variants of clear speech. Folia Phoniatrica Logopaedica, 65(3), 148-153.
Lam, J., & Tjaden, K. (2013). Intelligibility of Clear Speech: Effect of Instruction. J Speech Lang Hear Res, 56(5), 1429-1440. doi: 10.1044/1092-4388(2013/12-0335.
Tjaden, K., Richards, E., Kuo, C., Wilding, G., & Sussman, J. (2013). Acoustic and Perceptual Consequences of Clear and Loud Speech. Folia Phoniatrica et Logopaedica, 65(4), 214-220.
Tjaden, K., Lam, J., & Wilding, G. (2013). Vowel Acoustics in Parkinson's Disease and Multiple Sclerosis: Comparison of Clear, Loud, and Slow Speaking Conditions. J Speech Lang Hear Res, 56(5), 1485-1502. doi: 10.1044/1092-4388(2013/12-0259).
Feenaughty, L. Tjaden, K., Benedict, R., & Weinstock-Guttman, B., & Benedict, R. (2013). Speech and pause characteristics in Multiple Sclerosis: Comparison of speakers with high and low neuropsychological test performance. Clinical Linguistics and Phonetics, 27, 134-151.
Lam, J., Tjaden, K., & Wilding, G. (2012). Acoustics of Clear Speech: Effect of Instruction. J Speech Lang Hear Res. doi: 10.1044/1092-4388(2012/11-0154)
Sussman, J. E., & Tjaden, K. (2012). Perceptual measures of speech from individuals with Parkinson's disease and multiple sclerosis: intelligibility and beyond. J Speech Lang Hear Res, 55(4), 1208-1219. doi: 10.1044/1092-4388(2011/11-0048.
Rodgers, J. D., Tjaden, K., Feenaughty, L., Weinstock-Guttman, B., & Benedict, R. H. (2012). Influence of Cognitive Function on Speech and Articulation Rate in Multiple Sclerosis. J Int Neuropsychol Soc, 1-8. doi: 10.1017/s1355617712001166
Tjaden, K. & Wilding, G. (2011). Speech and pause
characteristics associated with rate reduction in
Parkinson’s disease and Multiple Sclerosis. Journal of Communication Disorders, 44, 655-665.
Tjaden, K. & Wilding, G. (2011). Effects of speaking rate on
intelligibility in Parkinson’s disease. Clinical
Linguistics and Phonetics.
Tjaden, K. & Wilding, G. (2011). The Impact of Rate Reduction and Increased Loudness on Fundamental Frequency Characteristics in Dysarthria. Folia Phoniatrica et Logopaedica, 63, 178-186
Tjaden, K., Sussman, J., Liu, G., & Wilding, G. (2010). Long Term Average Spectral Measures of Dysarthria and their Relationship to Perceived Severity. Journal of Medical Speech-Language Pathology, 18, 125-132.