ERIC Number: EJ1034686
Record Type: Journal
Publication Date: 2014-Apr
Abstractor: As Provided
Reference Count: N/A
Spatial and Temporal Lingual Coarticulation and Motor Control in Preadolescents
Zharkova, Natalia; Hewlett, Nigel; Hardcastle, William J.; Lickley, Robin J.
Journal of Speech, Language, and Hearing Research, v57 n2 p374-388 Apr 2014
Purpose: In this study, the authors compared coarticulation and lingual kinematics in preadolescents and adults in order to establish whether preadolescents had a greater degree of random variability in tongue posture and whether their patterns of lingual coarticulation differed from those of adults. Method: High-speed ultrasound tongue contour data synchronized with the acoustic signal were recorded from 15 children (ages 10-12 years) and 15 adults. Tongue shape contours were analyzed at 9 normalized time points during the fricative phase of schwa-fricative-/a/ and schwa-fricative-/i/ sequences with the consonants /s/ and /?/. Results: There was no significant age-related difference in random variability. Where a significant vowel effect occurred, the amount of coarticulation was similar in the 2 groups. However, the onset of the coarticulatory effect on preadolescent /?/ was significantly later than on preadolescent /s/, and also later than on adult /s/ and /?/. Conclusions: Preadolescents have adult-like precision of tongue control and adult-like anticipatory lingual coarticulation with respect to spatial characteristics of tongue posture. However, there remains some immaturity in the motor programming of certain complex tongue movements.
Descriptors: Motion, Human Body, Preadolescents, Adults, Comparative Analysis, Articulation (Speech), Age Differences, Acoustics, Speech Communication, Vowels
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A