| Increasing phonological complexity reveals heightened instability in inter-articulatory coordination in adults who stutter. | |
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MedLine Citation:
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PMID: 20412979 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The potential role of phonological complexity in destabilizing the speech motor systems of adults who stutter was explored by assessing the performance of 17 adults who stutter and 17 matched control participants on a nonword repetition task. The nonwords varied in length and phonological complexity. Behavioral results revealed no differences between the stuttering and normally fluent groups on accuracy of nonword repetition. In contrast, dramatic differences between groups were observed in the kinematic data. Indices of the consistency of inter-articulator coordination revealed that adults who stutter were much less consistent in their coordinative patterns over repeated productions. With increasing length and complexity of the nonwords, between-group differences in coordinative consistency were more pronounced. Coordination consistency measures revealed that adults who stutter (but not normally fluent adults) showed within-session practice effects; their coordinative consistency improved in five later compared to five earlier productions. Adults who stutter produced the nonwords at a slower rate, but both groups showed increased rates of production on the later trials, indicating a practice effect for duration for both groups. We conclude that, though the adults who stutter performed behaviorally with the same accuracy as normally fluent adults, the nonword repetition task reveals remarkable differences in the speech motor dynamics underlying fluent speech production in adults who stutter compared to their normally fluent peers. These results support a multifactorial, dynamic model of stuttering in which linguistic complexity and utterance length are factors that contribute to the probability of breakdown of the speech motor system. EDUCATIONAL OBJECTIVES: After reading this article, the reader will be able to: (1) summarize the literature on potential language/motor interactions in stuttering, and (2) evaluate to what extent the study findings support the hypothesis that phonologically complex utterances have a destabilizing effect on the speech motor system in individuals who stutter. |
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Authors:
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Anne Smith; Neeraja Sadagopan; Bridget Walsh; Christine Weber-Fox |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2009-12-22 |
Journal Detail:
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Title: Journal of fluency disorders Volume: 35 ISSN: 1873-801X ISO Abbreviation: J Fluency Disord Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-04-23 Completed Date: 2010-07-19 Revised Date: 2012-01-17 |
Medline Journal Info:
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Nlm Unique ID: 7601744 Medline TA: J Fluency Disord Country: United States |
Other Details:
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Languages: eng Pagination: 1-18 Citation Subset: IM |
Affiliation:
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Department of Speech, Language, Hearing Sciences, Purdue University, 1353 Heavilon Hall, West Lafayette, IN 47907-1353, United States. asmith@purdue.edu <asmith@purdue.edu> |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Biomechanics Female Humans Lip / physiopathology Male Middle Aged Motor Skills / physiology* Mouth / physiopathology* Phonetics* Practice (Psychology) Speech / physiology* Stuttering / physiopathology* Task Performance and Analysis Time Factors Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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DC00559/DC/NIDCD NIH HHS; R01 DC000559-19/DC/NIDCD NIH HHS; R01 DC000559-22/DC/NIDCD NIH HHS |
| Comments/Corrections | |
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