Articulatory Movements in Adolescents: Evidence for Protracted Development of Speech Motor Control Processes.
In order to contribute to a more comprehensive model of speech motor development, we examined the movement trajectories of the upper lip, lower lip, and jaw to determine (a) if there are changes in articulatory motor control in late adolescence; (b) if there are sex differences during this developme...
| Published in: | Journal of Speech, Language & Hearing Research Vol. 45; no. 6; pp. 1119 - 1134 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Published: |
American Speech-Language-Hearing Association
December 2002
|
| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=507792240&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 507792240 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 2002 vid: 45 iid: 6 pid: 42 pub: American Speech-Language-Hearing Association artinfo: ui: 507792240 10.1044/1092-4388(2002/090) ppf: 1119 ppct: 15 formats: fmt: – @attributes: type: T – @attributes: type: P size: 8.1MB tig: atl: Articulatory Movements in Adolescents: Evidence for Protracted Development of Speech Motor Control Processes. aug: au: Walsh, Bridget Smith, Anne su: Adolescent psychology Motor ability Articulation (Speech) sug: subj: Adolescent psychology Motor ability Articulation (Speech) ab: In order to contribute to a more comprehensive model of speech motor development, we examined the movement trajectories of the upper lip, lower lip, and jaw to determine (a) if there are changes in articulatory motor control in late adolescence; (b) if there are sex differences during this developmental period, perhaps related to differences in craniofacial growth rates; (c) if control of jaw motion is adultlike earlier than control of the upper and lower lip; and (d) if control of spatial and temporal aspects of articulatory movement co-develop in adolescence. Participants were 12-, 14-, and 1 6-year-olds, and young adults (mean age 21.2 years), with 15 males and 15 females per group. A measure reflecting spatiotemporal consistency in trajectory formation for repeated productions of a phrase was calculated for the upper lip, lower lip, and jaw movements. Overall trajectory variability was higher for adolescents compared to young adults. Jaw trajectories were less variable than upper lip or lower lip trajectories, but all effectors showed parallel decreases in variability as age increased, suggesting that control of jaw movement does not reach adult performance before control of the lips. Separate temporal and spatial measures revealed that adolescents had significantly longer movement durations, lower velocities, smaller displacements, and greater variability on these measures than young adults. There were no sex differences on any measure examined, suggesting that peripheral growth factors do not account for this protracted developmental time course. These results provide initial evidence of significant changes in speech motor control processes during adolescence. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
|---|