August 9, 2023

Summer camp for children who stutter helps them become effective communicators.


July 27, 2022

UD researchers study the brains of children with persistent stuttering to determine what hinders recovery.



Researchers are delving into the biological underpinnings of stuttering.


Like presidential candidate Joe Biden, researcher Evan Usler has used his personal experience to help those with speech disorders.


2020 – present

Beal, D., Usler, E., & Tendera, A. (2022). Neural and Physiological Processes. In Zebrowski, P., Anderson, J., and Conture, E. (eds.) Stuttering and Related Fluency Disorders. Thieme Medical Publishers.

Benito-Aragón, C., Gonzalez-Sarmiento, R., Liddell, T., Diez, I., Uquillas, F. D. O., Ortiz-Terán, L., Bueichekú E., Chow H. M., Chang S.E., & Sepulcre, J. (2020). Neurofilament-lysosomal genetic intersections in the cortical network of stuttering. Progress in Neurobiology, 184, 101718.

Boecher, J., Franich, K., & Usler, E. (2022). Rhythm of speech in people who do and do not stutter – A quantitative analysis using the normalized pairwise variability index. Proceedings of the International Conference on Speech Prosody 2022, 57-61.

Boley, N., Patil, S., Garnett, E. O., Li, H., Chugani, D. C., Chang, S. E., & Chow, H. M. (2021). Association between gray matter volume variations and energy utilization in the brain: implications for developmental stuttering. Journal of Speech, Language, and Hearing Research, 64(6S), 2317-2324.

Chow, H. M., Garnett, E. O., Koenraads, S. P., & Chang, S. E. (2023). Brain Developmental Trajectories Associated with Childhood Stuttering Persistence and Recovery. Developmental Cognitive Neuroscience, 60, 101224.

Chow, H. M., Garnett, E. O., Li, H., Etchell, A., Sepulcre, J., Drayna, D., & Chang, S. E. (2020). Linking lysosomal enzyme targeting genes and energy metabolism with altered gray matter volume in children with persistent stuttering. Neurobiology of Language, 1(3), 365-380.

Chow, H. M., Garnett, E. O., Ratner, N. B., & Chang, S. E. (2023). Brain activity during the preparation and production of spontaneous speech in children with persistent stuttering. NeuroImage. Clinical38, 103413. Advance online publication.

Chow, H. M., Li, H., Liu, S., Frigerio-Domingues, C., & Drayna, D. (2021). Neuroanatomical anomalies associated with rare AP4E1 mutations in people who stutter. Brain Communications, 3(4), fcab266.

Garnett, E. O., Chow, H. M., Limb, S., Liu, Y., & Chang, S. E. (2022). Neural activity during solo and choral reading: A functional magnetic resonance imaging study of overt continuous speech production in adults who stutter. Frontiers in Human Neuroscience, 16.

Johnson, C. A., Garnett, E. O., Chow, H. M., Spray, G. J., Zhu, D. C., & Chang, S. E. (2021). Developmental Factors That Predict Head Movement During Resting-State Functional Magnetic Resonance Imaging in 3–7-Year-Old Stuttering and Non-stuttering Children. Frontiers in Neuroscience, 1488.

Rong, P., Usler, E., Rowe, L. R., Allison, K., Woo, J., El Fakhri, G., & Green, J. (2021). Speech intelligibility loss due to Amyotrophic Lateral Sclerosis: The effect of tongue movement reduction on vowel and consonant acoustic features. Clinical Linguistics & Phonetics, 1–22.

Usler, E. (2022). Communicative fluency and the experience of stuttering: A viewpoint. Journal of Speech, Language, and Hearing Research: JSLHR, 1–8.

Usler, E. (2022). Why stuttering occurs: The role of cognitive conflict and control. Topics in Language Disorders, 42(1), 24.


2019 or before


Byrd, C., McGill, M., & Usler, E. (2015). Nonword repetition and phoneme elision in adults who do and do not stutter: Vocal versus nonvocal performance differences. Journal of Fluency Disorders, 44, 17–31.

Chang, S. E., Angstadt, M., Chow, H. M., Etchell, A. C., Garnett, E. O., Choo, A. L., Kessler D., Welsh R. C., & Sripada, C. (2018). Anomalous network architecture of the resting brain in children who stutter. Journal of Fluency Disorders, 55, 46-67.

Chang, S. E., Chow, H. M., Wieland, E. A., & McAuley, J. D. (2016). Relation between functional connectivity and rhythm discrimination in children who do and do not stutter. NeuroImage: Clinical, 12, 442-450.

Chang, S. E., Garnett, E. O., Etchell, A., & Chow, H. M. (2019). Functional and neuroanatomical bases of developmental stuttering: current insights. The Neuroscientist, 25(6), 566-582.

Chow, H. M., & Chang, S. E. (2017). White matter developmental trajectories associated with persistence and recovery of childhood stuttering. Human Brain Mapping, 38(7), 3345-3359.

Etchell, A., Adhikari, A., Weinberg, L. S., Choo, A. L., Garnett, E. O., Chow, H. M., & Chang, S. E. (2018). A systematic literature review of sex differences in childhood language and brain development. Neuropsychologia, 114, 19-31.

Garnett, E. O., Chow, H. M., & Chang, S. E. (2019). Neuroanatomical correlates of childhood stuttering: MRI indices of white and gray matter development that differentiate persistence versus recovery. Journal of Speech, Language, and Hearing Research, 62(8S), 2986-2998.

Garnett, E. O. D., Chow, H. M., Choo, A. L., & Chang, S. E. (2019). Stuttering severity modulates effects of non-invasive brain stimulation in adults who stutter. Frontiers in Human Neuroscience, 13, 411.

Garnett, E. O., Chow, H. M., Nieto-Castañón, A., Tourville, J. A., Guenther, F. H., & Chang, S. E. (2018). Anomalous morphology in left hemisphere motor and premotor cortex of children who stutter. Brain, 141(9), 2670-2684.

Haebig, E., Leonard, L. B., Deevy, P., Karpicke, J., Christ, S. L., Usler, E., Kueser, J. B., Souto, S., Krok, W., & Weber, C. (2019). Retrieval-based word learning in young typically developing children and children with Development Language Disorder II: A comparison of retrieval schedules. Journal of Speech, Language, and Hearing Research, 62(4), 944–964.

Haebig, E., Leonard, L., Usler, E., Deevy, P., & Weber, C. (2018). An initial investigation of the neural correlates of word processing in preschoolers with Specific Language Impairment. Journal of Speech, Language, and Hearing Research, 61(3), 729-739.

Kreidler, K., Hampton Wray, A., Usler, E., & Weber, C. (2017). Neural indices of semantic processing in early childhood distinguish eventual stuttering persistence and recovery. Journal of Speech, Language, and Hearing Research, 60(11), 3118-3134.

Raza, M. H., Domingues, C. E., Webster, R., Sainz, E., Paris, E., Rahn, R., Gutierrez J., Chow H. M., Mundorff J., Kang C. S., Riaz N., Basra M. A., Khan S., Riazuddin S., Moretti-Ferreira D., Braun A., & Drayna, D. (2016). Mucolipidosis types II and III and non-syndromic stuttering are associated with different variants in the same genes. European Journal of Human Genetics, 24(4), 529-534.

Usler, E., Smith, A., & Weber, C. (2017). A lag in speech motor coordination during Sentence production is associated with stuttering persistence in young children. Journal of Speech, Language, and Hearing Research, 60(1), 51-61.

Usler, E., & Walsh, B. (2018). The effects of syntactic complexity and sentence length on the speech motor control of school-age children who stutter. Journal of Speech, Language, and Hearing Research, 61(9), 2157–2167.

Usler, E., & Weber-Fox, C. (2015). Neurodevelopment for syntactic processing distinguishes childhood stuttering recovery versus persistence. Journal of Neurodevelopmental Disorders, 7(1), 4.

Walsh, B., & Usler, E. (2019). Physiological correlates of fluent and stuttered speech production in preschool children who stutter. Journal of Speech, Language, and Hearing Research, 62(12), 4309-4323.