Physiologic Development of Tongue--Jaw Coordination From Childhood to Adulthood

Hei Yan Cheng; Murdoch, Bruce E.; Goozée, Justine V.; Scott, Dion
April 2007
Journal of Speech, Language & Hearing Research;Apr2007, Vol. 50 Issue 2, p352
Academic Journal
Purpose: This investigation aimed to examine the development of tongue-jaw coordination during speech from childhood to adolescence. Method: Electromagnetic articulography was used to track tongue and jaw motion in 48 children and adults (aged 6-38 years) during productions of /t/ and /k/ embedded in sentences. Results: The coordinative organization of the tongue and jaw exhibited changes until the age of 8-11 years and continued to undergo refinement into late adolescence. The tongue-tip and tongue-body were observed to develop unique kinematic relations with the jaw. While tongue-tip movement became increasingly synchronized with jaw movement, tongue-body and jaw retained movement independence but developed a more consistent kinematic relation. Conclusion: The present results support the notion that speech motor development is nonuniform, with a refinement period from mid-childhood to late adolescence.


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