Edwin Maas

Associate Professor
Communication Sciences and Disorders
1701 N 13th St


Edwin Maas received a master's degree in neurolinguistics from the University of Groningen (the Netherlands), and worked as a clinical linguist at the Rotterdam Aphasia Foundation before pursuing his PhD in language and communicative disorders from San Diego State University and the University of California, San Diego. His early research focused on verb and sentence processing in aphasia and basic mechanisms of sentence comprehension. His interest in treatment research led him to shift focus to speech production and its disorders. To supplement his background and training in neurolinguistics, he obtained postdoctoral training at Boston University and the Massachusetts Institute of Technology with a focus on speech motor control. He joined Temple University’s Department of Communication Sciences and Disorders in 2015.

As Co-Director of the Speech, Language, and Brain Laboratory (SLAB Lab), he conducts research on speech production across the lifespan in unimpaired individuals and in various populations with speech and/or language disorders, such as aphasia, apraxia of speech, and phonological disorders. Two central, overarching questions motivate and drive this research: (1) What is the underlying nature of a given speech disorder? and (2) How can we optimize treatment for speech disorders?

Regarding the first question, research focuses on the various underlying mechanisms, representations and processes involved in generating speech, how these may be disrupted in speech disorders, and how we can identify and characterize such disruptions. This research line combines different methodologies, including perceptual speech error analysis, psycholinguistic reaction time studies, acoustic analysis, and neuropsychology. Regarding the second question, Dr. Maas conducts treatment studies to determine the efficacy of treatment for speech disorders, as well as to identify practice conditions that optimize speech motor learning (principles of motor learning derived from the motor skill learning literature). Both lines of research are theoretically motivated and have implications for models of normal speech production as well as for clinical practice, including diagnosis and treatment.


  • PhD, Language and Communicative Disorders, San Diego State University
  • MA, Neurolinguistics, University of Groningen
  • BA, Dutch Linguistics and Literature, University of Groningen

Curriculum Vitae 

Courses Taught




CSCD 5524

Foundations and Management of Motor Speech Disorders


CSCD 5546

Research Methods in Communication Sciences and Disorders


Selected Publications

  • Beiting, M. & Maas, E. (2021). Autism-Centered Therapy for Childhood Apraxia of Speech (ACT4CAS): A Single-Case Experimental Design Study. Am J Speech Lang Pathol, 30(3S), pp. 1525-1541. United States. doi: 10.1044/2020_AJSLP-20-00131

  • Spencer, C., Vannest, J., Maas, E., Preston, J.L., Redle, E., Maloney, T., & Boyce, S. (2021). Neuroimaging of the Syllable Repetition Task in Children With Residual Speech Sound Disorder. J Speech Lang Hear Res, 64(6S), pp. 2223-2233. United States. doi: 10.1044/2020_JSLHR-20-00269

  • Mailend, M., Maas, E., Beeson, P.M., Story, B.H., & Forster, K.I. (2021). Examining speech motor planning difficulties in apraxia of speech and aphasia via the sequential production of phonetically similar words. Cogn Neuropsychol, 38(1), pp. 72-87. England. doi: 10.1080/02643294.2020.1847059

  • Murray, E., Iuzzini-Seigel, J., Maas, E., Terband, H., & Ballard, K.J. (2021). Differential Diagnosis of Childhood Apraxia of Speech Compared to Other Speech Sound Disorders: A Systematic Review. Am J Speech Lang Pathol, 30(1), pp. 279-300. United States. doi: 10.1044/2020_AJSLP-20-00063

  • Terband, H., Rodd, J., & Maas, E. (2020). Testing hypotheses about the underlying deficit of apraxia of speech through computational neural modelling with the DIVA model. Int J Speech Lang Pathol, 22(4), pp. 475-486. England. doi: 10.1080/17549507.2019.1669711

  • Mailend, M. & Maas, E. (2020). To Lump or to Split? Possible Subtypes of Apraxia of Speech. Aphasiology, 35(4), pp. 592-613. England. doi: 10.1080/02687038.2020.1836319

  • Maas, E., Gildersleeve-Neumann, C., Jakielski, K., Kovacs, N., Stoeckel, R., Vradelis, H., & Welsh, M. (2019). Bang for Your Buck: A Single-Case Experimental Design Study of Practice Amount and Distribution in Treatment for Childhood Apraxia of Speech. J Speech Lang Hear Res, 62(9), pp. 3160-3182. United States. doi: 10.1044/2019_JSLHR-S-18-0212

  • Terband, H., Namasivayam, A., Maas, E., Brenk, F.v., Mailend, M., Diepeveen, S., Lieshout, P.v., & Maassen, B. (2019). Assessment of Childhood Apraxia of Speech: A Review/Tutorial of Objective Measurement Techniques. J Speech Lang Hear Res, 62(8S), pp. 2999-3032. United States. doi: 10.1044/2019_JSLHR-S-CSMC7-19-0214

  • Maassen, B., Terband, H., Maas, E., & Namasivayam, A. (2019). Preface to the Special Issue: Select Papers From the 7th International Conference on Speech Motor Control. J Speech Lang Hear Res, 62(8S), pp. 2923-2925. United States. doi: 10.1044/2019_JSLHR-S-CSMC7-19-0247

  • DeDe, G., Hoover, E., & Maas, E. (2019). Two to Tango or the More the Merrier? A Randomized Controlled Trial of the Effects of Group Size in Aphasia Conversation Treatment on Standardized Tests. J Speech Lang Hear Res, 62(5), pp. 1437-1451. United States. doi: 10.1044/2019_JSLHR-L-18-0404

  • Mailend, M., Maas, E., Beeson, P.M., Story, B.H., & Forster, K.I. (2019). Speech motor planning in the context of phonetically similar words: Evidence from apraxia of speech and aphasia. Neuropsychologia, 127, pp. 171-184. England. doi: 10.1016/j.neuropsychologia.2019.02.018

  • Terband, H., Maassen, B., & Maas, E. (2019). A Psycholinguistic Framework for Diagnosis and Treatment Planning of Developmental Speech Disorders. Folia Phoniatr Logop, 71(5-6), pp. 216-227. Switzerland. doi: 10.1159/000499426

  • Hoover, E.L., DeDe, G., & Maas, E. (2018). Effects of group size on conversation treatment outcomes: Results of standardized testing. Aphasiology, 32(Suppl 1), pp. 93-95. England. doi: 10.1080/02687038.2018.1487004

  • Preston, J.L., Leece, M.C., McNamara, K., & Maas, E. (2017). Variable Practice to Enhance Speech Learning in Ultrasound Biofeedback Treatment for Childhood Apraxia of Speech: A Single Case Experimental Study. Am J Speech Lang Pathol, 26(3), pp. 840-852. United States. doi: 10.1044/2017_AJSLP-16-0155

  • Maas, E. (2017). Speech and nonspeech: What are we talking about? Int J Speech Lang Pathol, 19(4), pp. 345-359. England. doi: 10.1080/17549507.2016.1221995

  • Maas, E. & Mailend, M. (2017). Fricative Contrast and Coarticulation in Children With and Without Speech Sound Disorders. Am J Speech Lang Pathol, 26(2S), pp. 649-663. United States. doi: 10.1044/2017_AJSLP-16-0110

  • Preston, J.L., Leece, M.C., & Maas, E. (2017). Motor-based treatment with and without ultrasound feedback for residual speech-sound errors. Int J Lang Commun Disord, 52(1), pp. 80-94. United States. doi: 10.1111/1460-6984.12259

  • Maas, E. (2017). Principles of motor learning in treatment for apraxia of speech. Frontiers in Human Neuroscience, 11. doi: 10.3389/conf.fnhum.2017.223.00094

  • Byun, T.M., Swartz, M.T., Halpin, P.F., Szeredi, D., & Maas, E. (2016). Direction of attentional focus in biofeedback treatment for /r/ misarticulation. Int J Lang Commun Disord, 51(4), pp. 384-401. United States. doi: 10.1111/1460-6984.12215

  • Preston, J.L., Leece, M.C., & Maas, E. (2016). Intensive Treatment with Ultrasound Visual Feedback for Speech Sound Errors in Childhood Apraxia. Front Hum Neurosci, 10, p. 440. Switzerland. doi: 10.3389/fnhum.2016.00440

  • Terband, H., Maassen, B., & Maas, E. (2016). A process-oriented approach to differential diagnosis and treatment planning of pediatric speech sound disorders. Stem-, Spraak- En Taalpathologie, 21, pp. 1-31.

  • Preston, J.L., Maas, E., Whittle, J., Leece, M.C., & McCabe, P. (2016). Limited acquisition and generalisation of rhotics with ultrasound visual feedback in childhood apraxia. Clin Linguist Phon, 30(3-5), pp. 363-381. England. doi: 10.3109/02699206.2015.1052563

  • Ballard, K.J., Wambaugh, J.L., Duffy, J.R., Layfield, C., Maas, E., Mauszycki, S., & McNeil, M.R. (2015). Treatment for Acquired Apraxia of Speech: A Systematic Review of Intervention Research Between 2004 and 2012. Am J Speech Lang Pathol, 24(2), pp. 316-337. United States. doi: 10.1044/2015_AJSLP-14-0118

  • Maas, E., Mailend, M., & Guenther, F.H. (2015). Feedforward and feedback control in apraxia of speech: effects of noise masking on vowel production. J Speech Lang Hear Res, 58(2), pp. 185-200. United States. doi: 10.1044/2014_JSLHR-S-13-0300

  • Preston, J.L., McCabe, P., Rivera-Campos, A., Whittle, J.L., Landry, E., & Maas, E. (2014). Ultrasound visual feedback treatment and practice variability for residual speech sound errors. J Speech Lang Hear Res, 57(6), pp. 2102-2115. United States. doi: 10.1044/2014_JSLHR-S-14-0031

  • Maas, E., Gildersleeve-Neumann, C., Jakielski, K.J., & Stoeckel, R. (2014). Motor-based intervention protocols in treatment of childhood apraxia of speech (CAS). Curr Dev Disord Rep, 1(3), pp. 197-206. Switzerland. doi: 10.1007/s40474-014-0016-4

  • Maas, E., Ballard, K.J., & Gutiérrez, K. (2014). Phonological encoding in apraxia of speech and aphasia. Aphasiology, 28(1), pp. 25-48. England. doi: 10.1080/02687038.2013.850651

  • Mailend, M. & Maas, E. (2013). Speech motor programming in apraxia of speech: evidence from a delayed picture-word interference task. Am J Speech Lang Pathol, 22(2), pp. S380-S396. United States. doi: 10.1044/1058-0360(2013/12-0101)

  • Maas, E. & Mailend, M. (2012). Speech planning happens before speech execution: online reaction time methods in the study of apraxia of speech. J Speech Lang Hear Res, 55(5), pp. S1523-S1534. United States. doi: 10.1044/1092-4388(2012/11-0311)

  • Maas, E., Butalla, C.E., & Farinella, K.A. (2012). Feedback frequency in treatment for childhood apraxia of speech. Am J Speech Lang Pathol, 21(3), pp. 239-257. United States. doi: 10.1044/1058-0360(2012/11-0119)

  • Maas, E. & Farinella, K.A. (2012). Random versus blocked practice in treatment for childhood apraxia of speech. J Speech Lang Hear Res, 55(2), pp. 561-578. United States. doi: 10.1044/1092-4388(2011/11-0120)

  • Ghosh, S.S., Matthies, M.L., Maas, E., Hanson, A., Tiede, M., Ménard, L., Guenther, F.H., Lane, H., & Perkell, J.S. (2010). An investigation of the relation between sibilant production and somatosensory and auditory acuity. J Acoust Soc Am, 128(5), pp. 3079-3087. United States. doi: 10.1121/1.3493430

  • Hula, S.N.A., Robin, D.A., Maas, E., Ballard, K.J., & Schmidt, R.A. (2008). Effects of feedback frequency and timing on acquisition, retention, and transfer of speech skills in acquired apraxia of speech. J Speech Lang Hear Res, 51(5), pp. 1088-1113. United States. doi: 10.1044/1092-4388(2008/06-0042)

  • Maas, E., Robin, D.A., Hula, S.N.A., Freedman, S.E., Wulf, G., Ballard, K.J., & Schmidt, R.A. (2008). Principles of motor learning in treatment of motor speech disorders. Am J Speech Lang Pathol, 17(3), pp. 277-298. United States. doi: 10.1044/1058-0360(2008/025)

  • Maas, E., Robin, D.A., Wright, D.L., & Ballard, K.J. (2008). Motor programming in apraxia of speech. Brain Lang, 106(2), pp. 107-118. Netherlands. doi: 10.1016/j.bandl.2008.03.004

  • Ballard, K.J., Maas, E., & Robin, D.A. (2007). Treating control of voicing in apraxia of speech with variable practice. Aphasiology, 21(12), pp. 1195-1217. doi: 10.1080/02687030601047858

  • Freedman, S.E., Maas, E., Caligiuri, M.P., Wulf, G., & Robin, D.A. (2007). Internal versus external: oral-motor performance as a function of attentional focus. J Speech Lang Hear Res, 50(1), pp. 131-136. United States. doi: 10.1044/1092-4388(2007/011)

  • Freedman, S.E., Maas, E., Caligiuri, M.P., Wulf, G., & Robin, D.A. (2007). Internal versus external: Oral-motor performance as a function of attentional focus. JOURNAL of SPEECH LANGUAGE and HEARING RESEARCH, 50(1), pp. 131-136. doi: 10.1044/1092-4388(2007/011)

  • Rhee, J.H., Robin, D.A., Maas, E., & Wright, D.L. (2006). Motor programming during speech articulation: An application of Klapp's two-process model. JOURNAL of SPORT & EXERCISE PSYCHOLOGY, 28, pp. S152-S153. Retrieved from http://gateway.webofknowledge.com/

  • Wright, D.L., Robin, D.A., Maas, E., & Magnuson, C.E. (2006). A general motor programming deficit contributes to apraxia of speech. JOURNAL of SPORT & EXERCISE PSYCHOLOGY, 28, pp. S195-S195. Retrieved from http://gateway.webofknowledge.com/

  • Bastiaanse, R., Edwards, S., Maas, E., & Rispens, J. (2003). Assessing comprehension and production of verbs and sentences: The Verb and Sentence Test (VAST). Aphasiology, 17(1), pp. 49-73. doi: 10.1080/729254890

  • Love, T., Maas, E., & Swinney, D. (2003). The influence of language exposure on lexical and syntactic language processing. Exp Psychol, 50(3), pp. 204-216. Germany. doi: 10.1026//1617-3169.50.3.204

  • Love, T., Maas, E., & Swinney, D. (2003). The influence of language exposure on lexical and syntactic language processing. EXPERIMENTAL PSYCHOLOGY, 50(3), pp. 204-216. doi: 10.1026//1617-3169.50.3.204

  • Maas, E., Barlow, J., Robin, D., & Shapiro, L. (2002). Treatment of sound errors in aphasia and apraxia of speech: Effects of phonological complexity. Aphasiology, 16(4-6), pp. 609-622. England. doi: 10.1080/02687030244000266

  • Bastiaanse, R. & Maas, E. (1998). Verb movement in agrammatic production. BRAIN and LANGUAGE, 65(1), pp. 52-55. Retrieved from http://gateway.webofknowledge.com/