All Stories

  1. Phonological Posterior Probabilities as Interpretable Markers of Articulatory Impairment in Motor Speech Disorders

    Article • Journal of Speech Language and Hearing Research, October 2026, American Speech-Language-Hearing Association (ASHA)

    Rene Utianski, Ph.D. Joseph R Duffy

  2. A Response to Mailend et al.: Refined Operational Definitions for the Apraxia of Speech Rating Scale

    Article • American Journal of Speech-Language Pathology, April 2026, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Rene Utianski

  3. What Is in a Label? The Importance of Clinical Specificity and Challenges of Diagnostic Evolution in Progressive Speech-Language Disorders

    Article • American Journal of Speech-Language Pathology, January 2026, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Rene Utianski

  4. Testing Feasibility of a Self-Administered Hearing Test for Patients With Progressive Apraxia of Speech and Aphasia

    Article • American Journal of Audiology, February 2025, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Rene Utianski, Ph.D. Joseph R Duffy

  5. Progression of Motor Speech Function in Speakers With Primary Progressive Apraxia of Speech

    Article • Journal of Speech Language and Hearing Research, November 2024, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Rene Utianski, Heather Clark

  6. Automatic Speech Recognition in Primary Progressive Apraxia of Speech

    Article • Journal of Speech Language and Hearing Research, August 2024, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Rene Utianski, Katerina Tetzloff, Daniela Wiepert

  7. Identifying and Addressing Functional Communication Challenges in Patients With Behavioral Variant Frontotemporal Dementia

    Article • American Journal of Speech-Language Pathology, June 2024, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Rene Utianski, Ph.D. Joseph R Duffy

  8. Rehabilitation Treatment Specification System: Content and Criterion Validity Across Evidence-Based Voice Therapies for Muscle Tension Dysphonia

    Article • American Journal of Speech-Language Pathology, April 2024, American Speech-Language-Hearing Association (ASHA)

    Dr. Nelson Roy, Ph.D. Joseph R Duffy

  9. Characterizing Speech Errors Across Primary Progressive Apraxia of Speech Subtypes

    Article • Journal of Speech Language and Hearing Research, February 2024, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Rene Utianski, Ph.D. Joseph R Duffy

  10. The Apraxia of Speech Rating Scale: Reliability, Validity, and Utility

    Article • American Journal of Speech-Language Pathology, March 2023, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Rene Utianski

  11. Rate Modulation Abilities in Acquired Motor Speech Disorders

    Article • Journal of Speech Language and Hearing Research, February 2023, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Dr. Julie A.G. Stierwalt, Rene Utianski

  12. Assessing Patients and Care Partner Ratings of Communication-Related Participation Restrictions: Insights From Degenerative Disease

    Article • American Journal of Speech-Language Pathology, February 2023, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Dr. Julie A.G. Stierwalt, Rene Utianski

  13. Understanding, Recognizing, and Managing Functional Speech Disorders: Current Thinking Illustrated With a Case Series

    Article • American Journal of Speech-Language Pathology, May 2022, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Rene Utianski

  14. Assessing Change in Communication Limitations in Primary Progressive Apraxia of Speech and Aphasia: A 1-Year Follow-Up Study

    Article • American Journal of Speech-Language Pathology, November 2021, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Rene Utianski

  15. Word Fluency Test Performance in Primary Progressive Aphasia and Primary Progressive Apraxia of Speech

    Article • American Journal of Speech-Language Pathology, November 2021, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Lucia Scheffel

  16. Voice Therapy According to the Rehabilitation Treatment Specification System: Expert Consensus Ingredients and Targets

    Article • American Journal of Speech-Language Pathology, September 2021, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Julie Barkmeier-Kraemer, Lisa Kelchner, Brian Petty, Dr. Nelson Roy

  17. A Cognitive Psychometric Investigation of Word Production and Phonological Error Rates in Logopenic Progressive Aphasia

    Article • American Journal of Speech-Language Pathology, May 2021, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy

  18. A Longitudinal Evaluation of Speech Rate in Primary Progressive Apraxia of Speech

    Article • Journal of Speech Language and Hearing Research, February 2021, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Rene Utianski

  19. Western Aphasia Battery–Revised Profiles in Primary Progressive Aphasia and Primary Progressive Apraxia of Speech

    Article • American Journal of Speech-Language Pathology, February 2020, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Heather Clark, Rene Utianski

  20. Clinical Progression in Four Cases of Primary Progressive Apraxia of Speech

    Article • American Journal of Speech-Language Pathology, November 2018, American Speech-Language-Hearing Association (ASHA)

    Heather Clark, Ph.D. Joseph R Duffy, Rene Utianski

  21. Electroencephalography in primary progressive aphasia and apraxia of speech

    Article • Aphasiology, November 2018, Taylor & Francis

    Ph.D. Joseph R Duffy, Heather Clark, Rene Utianski

  22. Quantitative Analysis of Agrammatism in Agrammatic Primary Progressive Aphasia and Dominant Apraxia of Speech

    Article • Journal of Speech Language and Hearing Research, September 2018, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Rene Utianski

  23. Tau uptake in agrammatic primary progressive aphasia with and without apraxia of speech

    Article • European Journal of Neurology, July 2018, Wiley

    Ph.D. Joseph R Duffy

  24. Motor Speech Disorders: Where Will We Be in 10 Years?

    Article • Seminars in Speech and Language, May 2016, Thieme Publishing Group

    Ph.D. Joseph R Duffy

  25. Apraxia of speech systematic review

    Article • American Journal of Speech-Language Pathology, May 2015, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Prof Kirrie J Ballard, Dr. Julie L Wambaugh, DR. Malcolm R McNeil, Edwin Maas

  26. Primary Progressive Apraxia of Speech: Clinical Features and Acoustic and Neurologic Correlates

    Article • American Journal of Speech-Language Pathology, May 2015, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy, Heather Clark

  27. The Diagnosis and Understanding of Apraxia of Speech: Why Including Neurodegenerative Etiologies May Be Important

    Article • Journal of Speech Language and Hearing Research, October 2012, American Speech-Language-Hearing Association (ASHA)

    Ph.D. Joseph R Duffy