Computational Neural Modeling of Speech Motor Control in Childhood Apraxia of Speech (CAS)
Purpose: Childhood apraxia of speech (CAS) has been associated with a wide variety of diagnostic descriptions and has been shown to involve different symptoms during successive stages of development. In the present study, the authors attempted to associate the symptoms of CAS in a particular develop...
| Publicado en: | Journal of Speech, Language & Hearing Research Vol. 52; no. 6; pp. 1595 - 1610 |
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| Autores principales: | , , , |
| Formato: | Artículo |
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American Speech-Language-Hearing Association
December 2009
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=508115599&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 508115599 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 10924388 1SM jtl: Journal of Speech, Language & Hearing Research issn: 10924388 maglogo: N pubinfo: dt: December 2009 vid: 52 iid: 6 pid: 42 pub: American Speech-Language-Hearing Association artinfo: ui: 508115599 10.1044/1092-4388(2009/07-0283) ppf: 1595 ppct: 15 formats: fmt: – @attributes: type: T – @attributes: type: P size: 6.7MB tig: atl: Computational Neural Modeling of Speech Motor Control in Childhood Apraxia of Speech (CAS) aug: au: Terband, Hayo Maassen, Ben Guenther, Frank H. Brumberg, Jonathan su: Speech therapy Speech disorders Sound Speech Apraxia sug: subj: Speech therapy Speech disorders Sound Speech Apraxia ab: Purpose: Childhood apraxia of speech (CAS) has been associated with a wide variety of diagnostic descriptions and has been shown to involve different symptoms during successive stages of development. In the present study, the authors attempted to associate the symptoms of CAS in a particular developmental stage with particular information-processing deficits by using computational modeling with the Directions Into Velocities of Articulators (DIVA) model. The hypothesis was that the speech production system in CAS suffers from poor feed-forward control and, consequently, an increased reliance on the feedback control subsystem. Method: In a series of computer simulations, the authors systematically varied the ratio between feed-forward and feedback control during production attempts in the acquisition of feed-forward motor commands. The simulations were evaluated acoustically on 4 selected key symptoms of CAS. Results: Results showed that increasing the reliance on feedback control causes increased severity of these 4 symptoms of CAS: deviant coarticulation, speech sound distortion, searching articulation, and increased variability. Conclusions: The findings support the idea that the key symptoms found in CAS could result from an increased reliance on feedback control due to poor feed-forward commands. Two possible root causes of degraded feed-forward control in CAS are discussed: reduced somatosensory information and increased levels of neural noise. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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