Contemporary Theories of Stuttering Development

The article presents a theoretical analysis of contemporary models of persistent stuttering development in children and adults at the current period of development of science. The accumulated amount of scientific knowledge suggests that stuttering has a neurological basis: it is associated with disorders in the structure and function of the brain. On this basis, there have been emerged models of stuttering that link the cause of a speech disorder with an unstable speech motor system. Theories and models of stuttering based on cognitive and language processing are likely to be useful in that they have explanatory power in relation to the mechanisms that play an important role in the production of key symptoms of stuttering. Considering that stuttering is a complex disorder, the logical result of this was the proposal of multifactorial models of impaired speech fluency. The presented overview may be useful to psychiatrists, clinical psychologists, speech therapists, teachers, and practitioners interacting with children and adults with stuttering and other speech fluency disorders.

1. Asatiani N.M., Kalacheva I.O., Baranova M.A. Rol' psihoterapii v protsesse kompleksnogo lechenija detej s zaikanijem [Role of psychotherapy in the complex treatment of children who stutter]. Zhurnal Nevrologii i Psikhiatrii imeni S.S. Korsakova = S.S. Korsakov Journal of Neurology and Psychiatry, 1981. Vol. 81, no. 10, pp. 1544–1547. (In Russ.; abstr. in Engl.)
2. Belyakova L.I. Teoreticheskije predstavlenija o mehanizmah narushenija tsentral'noi regulyatsii rechevoi funktsii pri zaikanii [Theoretical views on mechanisms of disorder of central regulation of speech function in stuttering]. Defectologiya = Defectology, 2018, no. 5, pp. 16–23. (In Russ.; abstr. in Engl.)
3. Vygotskii L.S. Myshlenie i rech'. Psikhologicheskie issledovaniya. [Thinking and speaking. Psychological research]. Moscow: Natsional'noe obrazovanie, 2019. 368 p. (In Russ.)
4. Glozman J.M., Karpova N.L., Cheburashkin-Antipov D.N. Dinamika izmenenij lichnosti i plavnosti rechi v hode logopsichoterapii zaikanija [Dynamics of personality changes and verbal fluency of persons who stutter after logopsychotherapy]. Defectologiya = Defectology, 2018, no. 5, pp. 51–57. (In Russ.; abstr. in Engl.)
5. Kalyagin V.A. Zaikanie: puti k ponimaniju [Stuttering: the ways to understanding]. Defectologiya = Defectology, 2018, no. 5, pp. 24–33. (In Russ.; abstr. in Engl.)
6. Kalyagin V.A. Emotsii v structure rechevogo defekta vzroslyh zaikayushikhsya [Emotions in the context of stuttering as a speech impediment in adults]. Izvestia Rossijskogo gosudarstvennogo pedagogicheskogo universiteta im. A.I. Gertsena = Izvestia: Herzen University Journal of Humanities & Sciences, 2018, no. 190, pp. 89–99. URL: https://lib.herzen.spb.ru/media/magazines/ contents/1/190/kalyagin_190_89_99.pdf (Accessed: 22.09.2022). (In Russ.; abstr. in Engl.)
7. Kisel'nikova N.V., Danina M.M. Strategicheskaya psihoterapia zaikanija: struktura problemy, napravleniya i tekhniki raboty s klientami [Strategic psychotherapy of stuttering: a structure of a problem, directions and techniques of treat]. Konsul'tativnaia psikhologiia i psikhoterapiia = Counseling Psychology and Psychotherapy, 2015, vol. 23, no. 2, pp. 131–141. DOI: 10.17759/cpp.2015230208 (In Russ.; abstr. in Engl.).
8. Levina R.E. O genezise zaikaniya u detej v svyazi s razvitiem kommunikativnoj funktsii rechi [About the genesis of stuttering in children due to development of communicative function of speech]. Defectologiya = Defectology, 2018, no. 5, pp. 5–9. (In Russ.; abstr. in Engl.)
9. Lokhov M.I., Fesenko Y.A. Mezhpolusharnoje vzaimodeistvije i rechevyje rasstroistva [Inter-hemispheric interaction and speech disorders]. Defectologiya = Defectology, 2018, no. 5, pp. 58–66. (In Russ.; abstr. in Engl.)
10. Serebryakova N.V., Shashkina G.R. Sovremennye tehnologii reabilitatsii doshol'nikov s zaikaniem v usloviyah inkluzivnogo obrasovaniya [Modern technologies of rehabilitation of pre-school children with stuttering in the setting of inclusive education]. Problemy sovremennogo pedagogicheskogo obrazovaniya = Problems of Modern Pedagogic Education, 2020, no. 4, pp. 171–174. URL: https://cyberleninka.ru/article/n/sovremennye-tehnologii-reabilitatsii-doshkolnikov-s-zaikaniem-v-usloviyah-inklyuzivnogo-obrazovaniya (Accessed: 22.09.2022). (In Russ.; abstr. in Engl.)
11. Fesenko Y.A., Lokhov M.I. Zaikanie: istoriya i obzor sovremennogo sostoyaniya problemy [Stuttering: history and overview of the present status of the problem]. Vestnik Sankt-Peterbugskogo universiteta = Vestniks of Saint Petersburg University, part 11: Medicine, 2015. I. 3, pp. 93–107. URL: http://vestnik.spbu.ru/html15/s11/s11v3/ s11v3.html (Accessed: 22.09.2022). (In Russ.; abstr. in Engl.)
12. Filatova Y.O. Ontogenez i dizontogenez plavnosti rechi u detej [Ontogenesis and dysontogenesis of speech fluency in children]. Defectologiya = Defectology, 2018, no. 5, pp. 33–42. (In Russ.; abstr. in Engl.)
13. Filatova Y.O., Aksenova A.O. Otechestvennyje i zarubezhnyje podhody k izucheniyu plavnosti rechi i eyo narushenij u detej doshkol'nogo vozrasta [Study of speech fluency and fluency disorders in preschool children: domestic and foreign approaches]. Sovremennoje doshkol'noje obrazovanije = Preschool Education Today, 2021, no. 5, pp. 62–69. DOI: 10.24412/1997­9657­2021­ 5107­62­69 (In Russ.; abstr. in Engl.)
14. Filatova Y.O., Ali L.S. Izuchenie dyhatel'noi funktsii u lits c narusheniyami rechi: obzor zarubezhnyh issledovaniy [Study of respiratory function in people with speech disorders: foreign studies]. Nauka i Shkola = Science and School, 2021, no. 5, pp. 66–76. DOI: 10.31862/1819-463X-2021-5-66-76 (In Russ.; abstr. in Engl.)
15. Adams M.R. The demands and capacities model I: Theoretical elaborations. Journal of Fluency Disorders, 1990, vol. 15, no. 3, pp. 135–141. DOI: 10.1016/0094-730X(90)90014-J
16. Anderson J. Phonological neighborhood and word frequency effects in the stuttered disfluencies of children who stutter. Journal of Speech, Language, and Hearing Research, 2007, vol. 50, no. 1, pp. 229–247. DOI: 10.1044/1092-4388(2007/018)
17. Anderson J., Wagovich S.A., Ofoe L. Cognitive flexibility for semantic and perceptual information in developmental stuttering. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 11, pp. 3659–3679. DOI: 10.1044/2020_JSLHR-19-00119
18. Andres E.M., Earnest K.K., Smith S.D. et al. Pedigree-based gene mapping supports previous loci and reveals novel suggestive loci in specific language impairment. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 12, pp. 4046–4061. DOI: 10.1044/2020_JSLHR-20-00102
19. Andrews G., Craig A., Feyer A. et al. Stuttering: A review of research findings and theories circa 1982. Journal of Speech and Hearing Disorders, 1983, vol. 48, no. 3, pp. 226–245. DOI: 10.1044 /jshd.4803.226
20. Arnstein D., Lakey B., Compton R. J. et al. Preverbal error-monitoring in stutterers and fluent speakers. Brain and Language, 2011, vol. 116, no. 3, pp. 105–115. DOI: 10.1016/j.bandl.2010.12.005
21. Arongna, Sakai N., Yasu K. et al. Disfluencies and strategies used by people who stutter during a working memory task. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 3, pp. 688–701. DOI: 10.1044/2019_JSLHR-19-00393
22. Au-Yeung J., Howell P., Pilgrim L. Phonological words and stuttering on function words. Journal of Speech, Language, and Hearing Research, 1998, vol. 41, pp. 1019–1030. DOI: 10.1044/jslhr.4105.1019
23. Bakhtiar M., Abad A.D., Panahi M.S. Nonword repetition ability of children who do and do not stutter and covert repair hypothesis. Indian Journal of Medical Sciences, 2007, vol. 61, no. 8, pp. 462–470. DOI: 10.4103/0019-5359.33711
24. Bauerly K.R., Mefferd A. Effects of attentional focus on speech motor control in adults who stutter and its relationship to social stress: a pilot project. Perspectives of the ASHA special interest groups, 2020, vol. 5, no. 4, pp. 884–894. DOI: 10.1044/2020_PERSP-20-00021
25. Beita-Ell C., Boyle M.P. School-based speech-language pathologists' perceived self-efficacy in conducting multidimensional treatment with children who stutter. Language, Speech, and Hearing Services in Schools, 2020, vol. 51, no. 4, pp. 1172–1186. DOI: 10.1044/2020_LSHSS-20-00044
26. Bernard R., Hofslundsengen H., Norbury C.F. Anxiety and depression symptoms in children and adolescents who stutter: a systematic review and meta-analysis. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 2, pp. 624–644. DOI: 10.1044/2021_JSLHR-21-00236
27. Bloodstein O. Early stuttering as a type of language difficulty. Journal of Fluency Disorders, 2002, vol. 27, no. 2, pp. 163–166. DOI: 10.1016/S0094-730X(02)00111-0
28. Bloodstein O. Incipient and developed stuttering as two distinct disorders: Resolving a dilemma. Journal of Fluency Disorders, 2001, vol. 26, no. 1, pp. 67–73. DOI: 10.1016/S0094-730X(00)00077-2
29. Bloodstein O. Some empirical observations about early stuttering: A possible link to language development. Journal of Communication Disorders, 2006, vol. 39, no. 3, pp. 185–191. DOI: 10.1016/j. jcomdis.2005.11.007
30. Bloodstein O., Ratner N.B. A handbook on stuttering. 6th ed. Clifton Park, NY: Delmar Learning, 2008. 552 p.
31. Boley N., Patil S., Garnett E.O. et al. Association between gray matter volume variations and energy utilization in the brain: implications for developmental stuttering. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 6S, pp. 2317–2324. DOI: 10.1044/2020_JSLHR-20-00325
32. Brocklehurst P.H. A review of evidence for the covert repair hypothesis of stuttering. Contemporary issues in communication science and disorders, 2008, vol. 35, pp. 25–43. DOI: 10.1044/cicsd_35_S_25
33. Brocklehurst P.H., Corley M. Investigating the inner speech of people who stutter: Evidence for (and against) the covert repair hypothesis. Journal of Communication Disorders, 2011, vol. 44, no. 2, pp. 246–260. DOI: 10.1016/j.jcomdis.2010.11.004
34. Brocklehurst P.H., Lickley R.J., Corley M. Revisiting Bloodstein’s anticipatory struggle hypothesis from a psycholinguistic perspective: A variable release threshold hypothesis of stuttering. Journal of Communication Disorders, 2013, vol. 46, no. 3, pp. 217–237. DOI: 10.1016/j.jcomdis.2013.04.002
35. Brocklehurst P.H., Lickley R.J., Corley M. The influence of anticipation of word misrecognition on the likelihood of stuttering. Journal of Communication Disorders, 2012, vol. 45, no. 3, pp. 147–160. DOI: 10.1016/j.jcomdis.2012.03.003
36. Brown L., Wilson L., Packman A. et al. Conversational speech of school-age children after syllable-timed speech treatment for stuttering. International Journal of Speech-Language Pathology, 2021, vol. 24, № 3, pp. 42–52. DOI: 10.1080/17549507.2021.1946152
37. Brundage S.B., Ratner N.B., Boyle M.P. et al. Consensus guidelines for the assessments of individuals who stutter across the lifespan. American Journal of Speech-Language Pathology, 2021, vol. 30, no. 6, pp. 2379–2393. DOI: 10.1044/2021_AJSLP-21-00107
38. Chang S., Erickson K., Ambrose N. et al. Brain anatomy differences in childhood stuttering. Neuroimage, 2008, vol. 39, no. 3, pp. 1333–1344. DOI: 10.1016/j.neuroimage. 2007.09.067
39. Chang S., Zhu D., Choo A. et al. White matter neuroanatomical differences in young children who stutter. Brain, 2015, vol. 138, part 3, pp. 694–711. DOI: 10.1093/brain/awu400
40. Chon H., Jackson E.S., Kraft S.J. et al. Deficit or difference? Effects of altered auditory feedback on speech fluency and kinematic variability in adults who stutter. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 7, pp. 2539–2556. DOI: 10.1044/2021_JSLHR-20-00606
41. Civier O., Bullock D., Max L. et al. Computational modeling of stuttering caused by impairments in a basal ganglia thalamo-cortical circuit involved in syllable selection and initiation. Brain and Language, 2013, vol. 126, no.3, pp. 263–278. DOI: 10.1016/j.bandl.2013.05.016
42. Coalson G.A., Byrd C.T. Phonetic complexity of words immediately following utterance-initial productions in children who stutter. Journal of Fluency Disorders, 2015, vol. 47, pp. 56–69. DOI: 10.1016/j.jfludis.2015.10.002
43. Corley M., Brocklehurst P.H., Moat H.S. Error biases in inner and overt speech: Evidence from tongue twisters. Journal of Experimental Psychology: Learning, Memory, and Cognition, 2011, vol. 37, no.1, pp. 162–175. DOI: 10.1037/a0021321
44. Cykowski M., Fox P., Ingham R., et al. A study of the reproducibility and etiology of diffusion anisotropy differences in developmental stuttering: a potential role for impaired myelination. Neuroimage, 2010, vol. 52, no. 4, pp. 1495–1504. DOI: 10.1016/j.neuroimage. 2010.05.011
45. De Sonneville-Koedoot C., Stolk E., Rietveld T. et al. Direct versus indirect treatment for preschool children who stutter: the RESTART randomized trial. PLoS ONE, 2015, vol. 10, no. 7, e0133758. DOI: 10.1371/journal.pone.0133758
46. Donaghy M., O'Brian S., Onslow M. et al. Verbal contingencies in the Lidcombe Program: a noninferiority trial. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 10, pp. 3419–3431. DOI: 10.1044/2020_JSLHR-20-00155
47. Douglass J.E., Kennedy C., Smith K. Speech-language therapy experiences across the life span of an individual who covertly stutters: a thematic analysis. Perspectives of the ASHA special interest groups, 2020, vol. 5, no. 6, pp. 1441–1453. DOI: 10.1044/2020_PERSP-20-00009_
48. Druker K., Mazzucchelli T., Hennessey N, et al. An evaluation of an integrated stuttering and parent-administered self-regulation program for early developmental stuttering disorders. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 9, pp. 2894–2912. DOI: 10.1044/2020_JSLHR-19-00310
49. Eichorn N., Marton K., Schwartz R.G. et al. Does working memory enhance or interfere with speech fluency in adults who do and do not stutter? Evidence from a dual-task paradigm. Journal of Speech, Language, and Hearing Research, 2016, vol. 59, no. 3, pp. 415–429. DOI: 10.1044/2015_JSLHR-S-15-0249
50. Eichorn N., Pirutinsky S. Cognitive flexibility and effortful control in school-age children with and without stuttering disorders. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 3, pp. 823–838. DOI: 10.1044/2020_JSLHR-20-00440
51. Eichorn N., Pirutinsky S. Dual-task effects on concurrent speech production in school-age children with and without stuttering disorders. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 6, pp. 2144–2159. DOI: 10.1044/2022_JSLHR-21-00426
52. Etchell A.C., Civier O., Ballard K.J. et al. A systematic literature review of neuroimaging research on developmental stuttering between 1995 and 2016. Journal of Fluency Disorders, 2018, vol. 55, pp. 6–45. DOI: 10.1016/j.jfludis.2017.03.007
53. Forster D.C., Webster W.C. Concurrent task interference in stutterers: Dissociating hemispheric specialization and activation. The Canadian Journal of Psychology, 1991, vol. 45, no. 3, pp. 321–335. DOI: 10.1037/h0084300
54. Forster D.C., Webster W.C. Speech-motor control and interhemispheric relations in recovered and persistent stuttering. Developmental Neuropsychology, 2001, vol. 19, no. 2, pp. 125–145. DOI: 10.1207 /S15326942DN1902_1
55. Frankford S., Murray E., Masapollo M., et al. The neural circuitry underlying the "rhythm effect" in stuttering. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 6S, pp. 2325–2346. DOI: 10.1044/2021_JSLHR-20-00328
56. Gahl S. Bilingualism as a purported risk factor for stuttering: a close look at a seminal study (Travis et al., 1937). Journal of Speech, Language, and Hearing Research, 2020. Vol. 63, no. 11, pp. 3680–3684. DOI: 10.1044/2020_JSLHR-20-00364
57. Gerwin K.L., Weber C. Neural indices mediating rhyme discrimination differ for some young children who stutter regardless of eventual recovery or persistence. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 4, pp. 1053–1070. DOI: 10.1044/ 2020_JSLHR-19-00260
58. Gkalitsiou Z., Byrd C., Griffin Z. Executive control in adults who stutter: The antisaccade task. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 6, pp. 1688–1699. DOI: 10.1044/2020_JSLHR-19-00045
59. Herring C., Millager R.A., Yaruss J.S. Outcomes following participation in a support-based summer camp for children who stutter. Language, Speech, and Hearing Services in Schools, 2022, vol. 53, no. 1, pp. 17–29. DOI: 10.1044/2021_LSHSS-21-00034
60. Hoff S.E., Unger J.P. Ecological intervention for stuttering in school-age children: A collaborative approach for school-based speech-language pathologists and mental health providers. Perspectives of the ASHA special interest groups, 2021, vol. 6, no. 3, P. 676–690. DOI: 10.1044/ 2021_PERSP-21-00003_
61. Howell P. Assessment of some contemporary theories of stuttering that apply to spontaneous speech. Contemporary Issues in Communicative Sciences and Disorders, 2004, vol. 31 (S), pp. 122–139. DOI: 10.1044/cicsd_31_S_123
62. Howell P. Behavioral effects arising from the neural substrates for atypical planning and execution of word production in stuttering. Experimental Neurology, 2010, vol. 225, no. 1, pp. 55–59. DOI: 10.1016/j.expneurol.2010.06.012
63. Jones M.L., Menzies R.G., Onslow M. et al. Measures of psychological impacts of stuttering in young school-age children: a systematic review. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 6, pp. 1918–1928. DOI: 10.1044/2021_JSLHR-20-00455
64. Kelly E.M. Modeling stuttering etiology: clarifying levels of description and measurement. Journal of Fluency Disorders, 2000, vol. 25, pp. 359–368. DOI: 10.1016/S0094-730X(00)00085-1
65. Kim K.S., Daliri A., Flanagan J.R. et al. Dissociated development of speech and limb sensorimotor learning in stuttering: Speech auditory-motor learning is impaired in both children and adults who stutter. Neuroscience, 2020, vol. 451, pp. 1–21. DOI: 10.1016/ j.neuroscience.2020.10.014
66. Kleinow J., Smith A. Influences of length and syntactic complexity on the speech motor stability of the fluent speech of adults who stutter. Journal of Speech, Language, and Hearing Research, 2000, vol. 43, no. 2, pp. 548–559. DOI: 10.1044/jslhr.4302.548
67. Koenraads S.P.C., Jansen P.W., Baatenburg de Jong R.J. Bidirectional associations of childhood stuttering with behavior and temperament. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 12, pp. 4563–4579. DOI: 10.1044/2021_JSLHR-20-00252
68. Kondrashov S.M., Tetnowski J.A. Anticipatory completions in conversations between people who stutter and people who do not stutter. Perspectives of the ASHA special interest groups, 2021, vol. 6, no. 6, pp. 1470–1440. DOI: 10.1044/2021_PERSP-21-00058
69. Kraft S., Yairi E. Genetic bases of stuttering: The state of the art, 2011. Folia Phoniatrica et Logopaedica, 2012, vol. 64, pp. 34–47. DOI: 10.1159/000331073
70. Law T., Packman A., Onslow M. et al. Rhythmic speech and stuttering reduction in a syllable-timed language. Clinical Linguistics & Phonetics, 2018, vol. 32, no. 10, pp. 932–949. DOI: 10.1080/02699206.2018.1480655
71. Lescht E., Dickey M.W., Stockbridge M.D. et al. Adults who stutter show diminished word fluency, regardless of mode. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 3, pp. 906–922. DOI: 10.1044/2021_JSLHR-21-00344
72. Levelt W.J.M. The ability to speak: from intentions to spoken words. European Review, 1995, vol. 3, no. 1, pp. 13–23. DOI: 10.1017/S1062798700001290
73. Lickley R. J., Hartsuiker R. J., Corley M. et al. Judgment of disfluency in people who stutter and people who do not stutter: Results from a magnitude estimation. Language and Speech, 2005, vol. 48, pp. 299–312. DOI: 10.1177/00238309050480030301
74. Lowe R., Menzies R., Onslow M. et al. Speech and anxiety management with persistent stuttering: current status and essential research. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 1, pp. 59–74. DOI: 10.1044/2020_JSLHR-20-00144
75. Maguire G.A., Nguyen D.L., Simonson K.C. et al. The pharmacologic treatment of stuttering and its neuropharmacologic basis. Frontiers in Neuroscience, 2020, vol. 14, article 158. DOI: 10.3389/fnins.2020.00158
76. Mancinelli J.M. A framework for a sociological description of the communicative interaction in adults who stutter. American Journal of Speech-Language Pathology, 2021, vol. 30, no. 4, pp. 1660–1672. DOI: 10.1044/2021_AJSLP-20-00279
77. Metten C., Bosshardt H., Jones M. et al. Dual tasking and stuttering: from the laboratory to the clinic. Disability and Rehabilitation, 2011, vol. 33, no. 11, pp. 933–1044. DOI: 10.3109/09638288.2010.515701
78. Namasivayam A., Van Lieshout P. Investigating speech motor practice and learning in people who stutter. Journal of fluency disorders, 2008, vol. 33, no. 1, pp. 32–51. DOI: 10.1016/j.jfludis.2007.11.005
79. Namasivayam A., Van Lieshout P. Speech motor skill and stuttering. Journal of Motor Behavior, 2011, vol. 43, no. 6, pp. 477–489. DOI: 10.1080/00222895.2011.628347
80. Neilson M., Neilson P. Speech motor control and stuttering: A computational model of adaptive sensory-motor processing. Speech Communication, 1987, vol. 6, no. 4, pp. 325–333. DOI: 10.1016/0167-6393(87)90007-0
81. Neilson P., Neilson M. An overview of adaptive model theory: Solving the problems of redundancy, resources, and nonlinear interactions in human movement control. Journal of neural engineering, 2005, vol. 2, no. 3, pp. S279–312. DOI: 10.1088/1741-2560/2/3/S10
82. Neilson P., Neilson M., O’Dwyer N. Adaptive model theory: Application to disorders of motor control. Advances in Psychology, 1992, vol. 84, pp. 495–548. DOI: 10.1016/S0166-4115(08)61697-0
83. Nippold M. Stuttering and phonology: Is there an interaction? American Journal of Speech-Language Pathology, 2002, vol. 11, no. 2, pp. 99–110. DOI: 10.1044/1058-0360(2002/011)
84. O'Brian S., Heard R., Onslow M. et al. Clinical trials of adult stuttering treatment: Comparison of percentage syllables stuttered with self-reported stuttering severity as primary outcomes. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 5, pp. 1387–1394. DOI: 10.1044/2020_JSLHR-19-00142
85. O'Brian S., Jones M., Packman A. et al. The complexity of stuttering behavior in adults and adolescents: relationship to age, severity, mental health, impact of stuttering, and behavioral treatment outcome. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 7, pp. 2446–2458. DOI: 10.1044/2022_JSLHR-21-00452
86. O'Brian S., Onslow M., Jones M. et al. Comparison of stuttering severity and anxiety during standard and challenge phone calls. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 3, pp. 982–990. DOI: 10.1044/2021_JSLHR-21-00365
87. Onslow M., van Doorn J., Newman D. Variability of acoustic segment durations after prolonged-speech treatment for stuttering. Journal of Speech and Hearing Research, 1992, vol. 35, no. 3, pp. 529–536. DOI: 10.1044/jshr.3503.529
88. Packman A. Theory and therapy in stuttering: A complex relationship. Journal of Fluency Disorders, 2012, vol. 37, no. 4, pp. 225–233. DOI: 10.1016/j.jfludis.2012.05.004
89. Packman A., Kuhn L. Looking at stuttering through the lens of complexity. International Journal of Speech-Language Pathology, 2009, vol. 11, no. 1, pp. 77–82. DOI: 10.1080/17549500802630039
90. Packman A., Onslow M., Menzies R.G. Novel speech patterns and the treatment of stuttering. Disability and Rehabilitation, 2000, vol. 22, no. 1–2, pp. 65–79. DOI: 10.1080/096382800297132
91. Packman A., Onslow M., Richard F. et al. Syllabic stress and variability: A model of stuttering. Clinical Linguistics and Phonetics, 1996, vol. 10, no. 3, pp. 235–263. DOI: 10.3109/02699209608985174
92. Packman A., Onslow M., van Doorn J. Prolonged-speech and modification of stuttering: Perceptual, acoustic and electroglottographic data. Journal of Speech and Hearing Research, 1994, vol. 37, no. 4, pp. 724–737. DOI: 10.1044/jshr.3704.724
93. Park V., Onslow M., Lowe R. et al. Predictors of Lidcombe Program treatment dropout and outcome for early stuttering. International Journal of Language & Communication Disorders, 2021, vol. 56, no. 1, pp. 102–115. DOI: 10.1111/1460-6984.12586
94. Park V., Onslow M., Lowe R. et al. Psychological characteristics of early stuttering. International Journal of Speech-Language Pathology, 2021, vol. 23, no. 6, pp. 622–631. DOI: 10.1080/17549507.2021.1912826
95. Postma A., Kolk A. The covert repair hypothesis: Prearticulatory repair processes in normal and stuttered disfluencies. Journal of Speech and Hearing Research, 1993, vol. 36, no. 3, pp. 472–487. DOI: 10.1044/jshr.3603.472
96. Rodgers N.H., Berquez A., Hollister J., et al. Using solution-focused principles with older children who stutter and their parents to elicit perspectives of therapeutic change. Perspectives of the ASHA special interest groups, 2020, vol. 5, no. 6, pp. 1427–1440. DOI: 10.1044/2020_PERSP-20-00124
97. Rodgers N.H., Gerlach H., Paiva A.L. et al. Applying the transtheoretical model to stuttering management among adolescents: Part II. Exploratory scale validation. American Journal of Speech-Language Pathology, 2021, vol. 30, no. 6, pp. 2510–2527. DOI: 10.1044/ 2021_AJSLP-21-00108
98. Rodgers N.H., Gerlach-Houck H. “Knowledge without action means nothing”: Stakeholder insights on the behaviors that constitute positive change for adults who stutter. American Journal of Speech-Language Pathology, 2022, vol. 31, no. 4, pp. 1637–1652. DOI: 10.1044/2022_AJSLP-21-00251
99. Rodgers N.H., Lau J.Y.F., Zebrowski P.M. Attentional bias among adolescents who stutter: evidence for a vigilance–avoidance effect. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 10, pp. 3349–3363. DOI: 10.1044/2020_JSLHR-20-00090
100. Ryer J.E., Poll G.H. The effectiveness of hybrid telepractice and in-person fluency treatment for a school-aged child: a case study. Perspectives of the ASHA special interest groups, 2020, vol. 5, no. 4, pp. 1085–1097. DOI: 10.1044/2020_PERSP-19-00133
101. Salvo H.D., Schmidt A.M. Acoustic measures of emotion in school-age children who stutter: findings from a single subject. Perspectives of the ASHA special interest groups, 2020, vol. 5, no. 4, pp. 895–907. DOI: 10.1044/2020_PERSP-19-00089
102. Savage C., Howell P. Lexical priming of function words and content words with children who do, and do not, stutter. Journal of Communication Disorders, 2008, vol. 41, no. 6, pp. 459–484. DOI: 10.1016/j.jcomdis.2008.01.004
103. Singer C.M., Hessling A., Kelly E.M. et al. Clinical characteristics associated with stuttering persistence: a meta-analysis. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 9, pp. 2995–3018. DOI: 10.1044/2020_JSLHR-20-00096
104. Singer C.M., Otieno S., Chang S.-E. et al. Predicting persistent developmental stuttering using a cumulative risk approach. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 1, pp. 70–95. DOI: 10.1044/2021_JSLHR-21-00162
105. Smith A., Kleinow J. Kinematic correlates of speaking rate changes in stuttering and normally fluent adults. Journal of Speech, Language, and Hearing Research, 2000, vol. 43, no. 2, pp. 521–536. DOI: 10.1044/jslhr.4302.521
106. Smith A., Weber C. How stuttering develops: The multifactorial dynamic pathways theory. Journal of Speech, Language, and Hearing Research, 2017, vol. 60, no. 9, pp. 2483–2505. DOI: 10.1044/2017_JSLHR-S-16-0343
107. Smits-Bandra S., De Nil L. Sequence skill learning in persons who stutter: Implications for cortico-striato-thalamocortical dysfunction. Journal of Fluency Disorders, 2007, vol. 32, no. 4, pp. 251–278. DOI: 10.1016/j.jfludis.2007.06.001
108. Starkweather C.W. A simple theory of stuttering. Journal of Fluency Disorders, 1995, vol. 20, pp. 91–116. DOI: 10.1016/0094-730X(94)00026-P
109. Starkweather C.W., Gottwald S.R. The demands and capacities model II: Clinical applications. Journal of Fluency Disorders, 1990, vol. 15, no. 3, pp. 143–157. DOI: 10.1016/0094-730X(90)90015-K
110. Starkweather C.W., Gottwald S.R. The demands and capacities model: Response to Siegel. Journal of Fluency Disorders, 2000, vol. 25, no. 4, pp. 369–375. DOI: 10.1016/S0094-730X(00)00086-3
111. Tichenor S.E., Constantino C., Yaruss J.S. A point of view about fluency. Journal of Speech, Language, and Hearing Research, 2022, vol. 65, no. 2, pp. 645–652. DOI: 10.1044/2021_JSLHR-21-00342
112. Tichenor S.E., Walsh B.M., Gerwin K.L. et al. Emotional regulation and its influence on the experience of stuttering across the life span. Journal of Speech, Language, and Hearing Research, 2022. Vol. 65, no. 3, pp. 1–19. DOI: 10.1044/2022_JSLHR-21-00467
113. Tichenor S.E., Yaruss J.S. Recovery and relapse: perspectives from adults who stutter. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 7, pp. 2162–2176. DOI: 10.1044/2020_JSLHR-20-00010
114. Tichenor S.E., Yaruss J.S. Variability of stuttering: behavior and impact. American Journal of Speech-Language Pathology, 2021, vol. 30, no. 1, pp. 75–88. DOI: 10.1044/ 2020_AJSLP-20-00112
115. Tran Y., Blumgart E., Craig A. Situational embarrassment and its relationship to social anxiety in adults who stutter. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 10, pp. 3759–3768. DOI: 10.1044/2021_JSLHR-21-00158
116. Treleaven S.B., Coalson G.A. Verbal response inhibition in adults who stutter. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 9, pp. 3382–3397. DOI: 10.1044/2021_JSLHR-20-00739
117. Tumanova V., Woods C., Razza R. The role of behavioral inhibition for conversational speech and language characteristics of preschool-age children who stutter. American Journal of Speech-Language Pathology, 2020, vol. 29, no. 2, pp. 638–651. DOI: 10.1044/2019_AJSLP-19-00026
118. Tumanova V., Woods C., Wang Q. Effects of physiological arousal on speech motor control and speech motor practice in preschool-age children who do and do not stutter. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 10, pp. 3364–3379. DOI: 10.1044/2020_JSLHR-20-00092
119. Unicomb R., Kefalianos E., Reilly S. et al. Prevalence and features of comorbid stuttering and speech sound disorder at age 4 years. Journal of Communication Disorders, 2020, vol. 84, article 105976. DOI: 10.1016/j.jcomdis.2020.105976
120. Usler E. Communicative fluency and the experience of stuttering: a viewpoint. Journal of Speech, Language, and Hearing Research, 2022, preprint, pp. 1–8. DOI: 10.1044/2022_JSLHR-22-00073
121. Van Lieshout P., Ben-David B., Lipski M. et al. The impact of threat and cognitive stress on speech motor control in people who stutter. Journal of Fluency Disorders, 2014, vol. 40, pp. 93–109. DOI: 10.1016/j.jfludis.2014.02.003
122. Vasiс N., Wijnen F. Stuttering as a monitoring deficit. In R. Hartsuiker R. et al. (eds.), Phonologic encoding and monitoring in normal and pathological speech. New York: Psychology Press, 2005, pp. 226–247. URL: https://ndl.ethernet.edu.et/bitstream/123456789/12114/1/26. pdf.pdf (Accessed: 27.09.2022).
123. Venkatagiri H.S. Recent advances in the treatment of stuttering: A theoretical perspective. Journal of Communication Disorders, 2005, vol. 38, no. 5, pp. 375–393. DOI: 10.1016/j.jcomdis.2005.03.001
124. Venkatagiri H.S. What do people who stutter want – fluency or freedom? Journal of Speech Language and Hearing Research, 2009, vol. 52, no. 2, pp. 500–515. DOI: 10.1044/1092-4388(2008/07-0019)
125. Venkatagiri H.S., Nataraja N., Deepthi M. Motor learning cannot explain stuttering adaptation. Perceptual and Motor Skills, 2013, vol. 117, no. 1, pp. 1235–1242. DOI: 10.2466/25.23.PMS.117x16z4
126. Walsh B., Bostian A., Tichenor S.E. et al. Disfluency characteristics of 4- and 5-year-old children who stutter and their relationship to stuttering persistence and recovery. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 8, pp. 2555–2566. DOI: 10.1044/2020_JSLHR-19-00395
127. Walsh B., Christ S., Weber C. Exploring relationships among risk factors for persistence in early childhood stuttering. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 8, pp. 2909–2927. DOI: 10.1044/2021_JSLHR-21-00034
128. Webster W.G. Brain models and the clinical management of stuttering. Canadian Journal of Speech-Language Pathology and Audiology, 1998, vol. 22, no. 4, pp. 220–231. URL: https://cjslpa.ca/files/1998_JSLPA_Vol_22/No_04_206-285/Webster_JSLPA_1998.pdf (Accessed: 22.09.2022).
129. Webster W.G. Neuropsychological models of stuttering – I. Representation of sequential response mechanisms. Neuropsychologia, 1985, vol. 23, no. 2, pp. 263–267. DOI: 10.1016/0028-3932(85)90110-1
130. Webster W.G. Neuropsychological models of stuttering – II. Interhemispheric interference. Neuropsychologia, 1986, vol. 24, no. 5, pp. 737–741. DOI: 10.1016/0028-3932(86)90014-X
131. Webster W.G. Sequence reproduction deficits in stutterers tested under nonspeed response conditions. Journal of Fluency Disorders, 1989, vol. 14, pp. 79–86. DOI: 10.1016/0094-730X(89)90001-6
132. Webster W.G., Ryan C. Task complexity and manual reaction times in people who stutter. Journal of Speech and Hearing Research, 1991, vol. 34, no. 4, pp. 708–714. DOI:10.1044/jshr.3404.708
133. Weidner K., Lowman J. Telepractice for adult speech-language pathology services: a systematic review. Perspectives of the ASHA Special Interest Groups, 2020, vol. 5, no. 1, pp. 326–338. DOI: 10.1044/2019_PERSP-19-00146
134. Wiltshire C.E.E., Chiew M., Chesters J. et al. Speech movement variability in people who stutter: a vocal tract magnetic resonance imaging study. Journal of Speech, Language, and Hearing Research, 2021, vol. 64, no. 7, pp. 2438–2452. DOI: 10.1044/2021_JSLHR-20-00507
135. Wray A.H., Spray G. Neural processes underlying non-word rhyme differentiate eventual stuttering persistence and recovery. Journal of Speech, Language, and Hearing Research, 2020, vol. 63, no. 8, pp. 2535–2554. DOI: 10.1044/2020_JSLHR-19-00320
136. Zebrowski P.M., Rodgers N.H., Gerlach H. et al. Applying the transtheoretical model to stuttering management among adolescents: Part I. Scale development. American Journal of Speech-Language Pathology, 2021, vol. 30, pp. 2492–2509. DOI: 10.1044/2021_AJSLP-20-00186