Speech Fluency

Welcome! The Speech Fluency Laboratory, located in Dauer Hall Room 62, is devoted to both basic and applied research in areas related to speech fluency. In recent years, research from the lab addressed a variety of topics, including the following: (1) the nature of fluency disorders (particularly developmental stuttering), (2) the effects of linguistic context upon fluency performance, (3) the impact of fluency disorders upon communicative functioning and quality of life, (4) listeners reactions to stuttering, (5) improving the reliability and efficiency of fluency assessment; and (6) assessing factors that affect the effectiveness of treatment approaches for stuttering.

Recent Publications

Byrd, C. T., Logan, K. J., & Gillam, R. B. (2012). Speech disfluency in school-age children’s conversational and narrative discourse. Language, Speech,& Hearing Services in Schools, 43, 153-163.

Logan, K.J., & Mazzocchi, E.M. (2011). Factors affecting occupational advice for speakers who do and do not stutter. Journal of Fluency Disorders. Advance online publication, doi:10.1016/j.jfludis.2011.11.005.

Logan, K.J. & Willis, J.R. (2011). The accuracy with which adults who do not stutter predict stuttering-related communication attitudes. Journal of Fluency Disorders, 36, 334-348.

Logan, K.J., Byrd, C.T., Mazzocchi, E.M., & Gillam, R.B. (2011). Speaking rate characteristics of elementary-aged children who do and do not stutter. Journal of Communication Disorders, 44, 130-147.

Jones, K.M. & Logan, K.J. (2010, October). Using fictional literature as a tool in fluency intervention programs for children and teens. Proceedings of International Stuttering Awareness Day Online Conference. http://www.mnsu.edu/comdis/kuster/stutter.html

Logan, K.J. (2010). Acquired stuttering. In J. S. Kreutzer, J. DeLuca, & B. Caplan (Eds.). Encyclopedia of clinical neuropsychology. New York, NY: Springer.

Logan, K.J. (2010). Developmental stuttering. In J. S. Kreutzer, J. DeLuca, & B. Caplan (Eds.). Encyclopedia of clinical neuropsychology. New York, NY: Springer.

Logan, K.J. (2010, April-May). Helping clients who clutter regulate speaking rate. Proceedings of the First Online Cluttering Conference. http://www.mnsu.edu/comdis/kuster/stutter.html

Gillam, R.G., Logan, K.J., & Pearson, N. (2009). The Test of Childhood Stuttering.Austin,TX: Pro-Ed. (A norm-referenced assessment instrument for diagnosing stuttering and determining stuttering severity in school-aged children.)

Logan, K.J., Jones, K.M, & Mullins, M.S. (2008). The depiction of stuttering in contemporary juvenile fiction: Implications for clinical practice. Psychology in the Schools, 45(7), 609-626.

Current Projects

  • Research grant: Effect of Concurrent Behavioral Fluency Therapy Upon Stuttering Treatment Outcomes in Speakers who Use the SpeechEasy Device. Sponsor: Janus Development Group.
  • Kelley, J., Griffiths, S.K., Logan, K.J.: Relationships between auditory processing and fluency in adults who stutter.
  • Logan, K.J. & Al-Ghamedei, A.: Clinical outcomes associated with prolonged speech-only and prolonged speech + SpeechEasy® interventions.

Characteristics of stuttered and fluent speech:

  • Park, J., & Logan, K.J. (In review). Effect of prosody altered feedback on stuttering frequency and associated speech production measures.
  • Cantwell, E., Stock, S., & Logan, K.J. : Disfluency duration in school-aged children who stutter.


Measurement of speech fluency

  • Logan, K.J., & Gillam, R.B. : Relationships between word- and utterance-based disfluency measures.
  • Al-Ghamedei, A. & Logan, K.J. : A Survey of Practices and Problems in Fluency Assessment.

Lab Assistants

  • Marisa Dunkel
  • Chris Holloway
  • Laura Martin
  • Jeri Parker