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Callier Center for Communication Disorders

Speech Production Laboratory

In the Speech Production Research Laboratory, we study speech – as it is perceived and produced – by adults and children. There is a particular focus on the speech of brain-injured talkers with disorders known as aphasia and apraxia-of-speech.  We are also exploring whether visual feedback concerning articulatory movement can be used as a new form of intervention/treatment for speech disorders after stroke.

Director Current personnel
Location Alumni
Projects Publications
Funding Research participants
Current students Laboratory meeting dates


Dr. William Katz (curriculum vitae)
Callier Center for Communication Disorders
1966 Inwood Road
Dallas, TX 75235
Office (214) 905-3188
Fax (214) 905-3006
Speech Production Lab Web site

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Callier Center Dallas

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  • Pathology of speech in aphasia.
  • Brain models of language representation.
  • Augmented kinematic feedback and the treatment of apraxia.
  • The foreign accent syndrome.
  • Speech production and perception: Acoustic phonetic features, coarticulation and speech motor planning.
  • Development of speech in children. Compensatory articulation and speech motor control.
  • Cue-trading relations at the prosody/syntax interface.

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The U.S. Department of Veteran Affairs (VA) collaborates with UT Dallas, the University of Pittsburgh and the Dallas and Pittsburgh VA hospitals (VA RR&D #B3670R).

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Current Students

Doctorate of Philosophy
June Levitt

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Current Personnel

Diane Garst

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Current Post-docs

Dr. Asimina Syrika

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Dr. Sneha Bharadwaj
Dr.  Michiko Yoshida

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J. Joglar, J. Nguyen, C., Garst, D. & Katz, W. (2008). Safety of Electromagnetic Articulography in Patients with Pacemakers and Implantable Cardioverter-Defibrillator Journal of Speech and Hearing Research, 52, 1082-1087.

Levitt, J., & Katz, W. (2008). Augmented visual feedback in second language learning: Training Japanese post-alveolar flaps to American English speakers. Proceedings of Meetings on Acoustics, Vol. 2, 060002.

Katz, W. Garst, D. and Levitt, J. (2008). The role of prosody in a case of foreign accent syndrome (FAS). Clinical Linguistics and Phonetics, 22, 537-566.

Bharadwaj, S.V., Katz, W.F. and Tobey, E.A. (2007). Effects of auditory feedback deprivation on non-native French vowels produced by children with cochlear implants. Audiological Medicine, 5, 274-282.

Katz, W., Carter, C. and Levitt, J. (2007). Treating buccofacial apraxia using augmented kinematic feedback. Aphasiology, 12, 1230-1247.

Bharadwaj, S.V., Tobey, E.A., Assmann, P.F. and Katz, W.F. (2006). Effects of auditory feedback on fricatives produced by cochlear implanted adults and children: Acoustic and perceptual evidence. Journal of the Acoustical Society of America, 119, 1626-35.

Katz, W., Bharadwaj, S., Rush, M. and Stettler, M. (2006). Influences of EMA receiver coils on speech production by normal and aphasic/apraxic talkers. Journal of Speech, Language, and Hearing Research, 49, 645-659.

Assmann, P. and Katz, W. (2005). Synthesis fidelity and time-varying spectral change in vowels. Journal of the Acoustical Society of America, 117, 886-895.

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Research Participants

We recruit members of the greater Dallas/Fort Worth community, including veterans and individuals with brain damage resulting from stroke.

We also recruit UT Dallas students as healthy control subjects. Children are often tested, including children recruited from the Callier educational programs.

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Laboratory Meeting Dates

Announced each semester. Contact Dr. Katz for times.

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